Ethernet Interface Configuration Commands

Transcription

1 Table of Contents Ethernet Interface Configuration Commands 1 General Ethernet Interface/Subinterface Configuration Commands 1 combo enable 1 description 1 display interface 2 display interface brief 9 duplex 13 interface 14 loopback 14 port link-mode 15 reset counters interface 16 shutdown 17 speed 18 sub-interface rate-statistic 18 Layer 2 Ethernet Interface/Subinterface Configuration Commands 19 broadcast-suppression (Ethernet interface view/ethernet sub-interface view) 19 jumboframe enable 20 mdi 21 multicast-suppression (Ethernet interface view/ethernet sub-interface view) 22 unicast-suppression (Ethernet interface view/ethernet sub-interface view) 22 Layer 3 Ethernet Interface/Subinterface Configuration Commands 23 mtu 23 promiscuous 24 i

2 Ethernet Interface Configuration Commands General Ethernet Interface/Subinterface Configuration Commands combo enable combo enable { copper fiber } Ethernet interface view (Combo interface) copper: Activates the electrical port of the Combo interface. fiber: Activates the optical port of the Combo interface. Use the combo enable command to activate the electrical or optical port of a Combo interface. By default, the electrical port of a Combo interface is activated. Combo interfaces are logical interfaces. A Combo interface comprises one optical (fiber) port and one electrical (copper) port. The two ports share one forwarding interface and thus cannot work simultaneously. If the electrical port is enabled, the optical port is disabled automatically and vice versa. # Activate the electrical port of Combo interface GigabitEthernet 0/1. [Sysname-GigabitEthernet0/1] combo enable copper # Activate the optical port of Combo interface GigabitEthernet 0/1. [Sysname-GigabitEthernet0/1] combo enable fiber description description text undo description 1

3 Ethernet interface view, Ethernet subinterface view text: Creates an interface description, a string of 1 to 80 characters. Valid characters and symbols include English letters (A to Z, a to z), digits (1 to 9), special English characters, spaces, and other Unicode characters and symbols. NOTE: Each Unicode character takes the space of two regular characters. To use a type of Unicode characters or symbols in an interface description, install the specific input method editor and log in to the device through remote login software that supports this character type. When the length of a description string reaches or exceeds the maximum line width on the terminal software, the software starts a new line, possibly breaking a Unicode character into two. As a result, garbled characters may be displayed at the end of a line. Use the description command to change the description of the current interface. Use the undo description command to restore the default. The default description of an interface is the interface name plus Interface, GigabitEthernet0/1 Interface for example. Related commands: display interface. # Change the description of interface GigabitEthernet 0/1 to lanswitch-interface. [Sysname-GigabitEthernet0/1] description lanswitch-interface # Change the description of Ethernet subinterface GigabitEthernet 0/1.1 to l2-subinterface0/ [Sysname- GigabitEthernet0/1.1] description l2-subinterface0/1.1 display interface Any view display interface [ interface-type [ interface-number interface-number.subnumber ] ] 1: Monitor level 2

4 interface-type: Specifies an interface type. interface-number: Specifies an interface number. interface-number.subnumber: Specifies a subinterface number, where interface-number is an interface number; subnumber is the number of a subinterface created under the interface. The value of subnumber ranges from 1 to Use the display interface command to display detailed information about interfaces, including their operating status. If no interface type is specified, the command displays detailed information about all interfaces. If only interface type is specified, the command displays detailed information about all interfaces of the particular type. If both interface type and interface number are specified, the command displays detailed information about only the specified interface. Related commands: interface. # Display detailed information about Layer 3 interface GigabitEthernet 0/1. <Sysname> display interface gigabitethernet 0/1 GigabitEthernet0/1 current state: DOWN ( Administratively ) Line protocol current state: DOWN : GigabitEthernet0/1 Interface The Maximum Transmit Unit is 1500, Hold timer is 10(sec) Internet protocol processing : disabled IP Packet Frame Type: PKTFMT_ETHNT_2, Hardware Address: 000f-e223-82f5 IPv6 Packet Frame Type: PKTFMT_ETHNT_2, Hardware Address: 000f-e223-82f5 Media type is optical fiber, loopback not set, promiscuous mode not set 100Mb/s, Full-duplex, link type is autonegotiation Output flow-control is disabled, input flow-control is disabled Output queue : (Urgent queue : Size/Length/Discards) 0/50/0 Output queue : (Protocol queue : Size/Length/Discards) 0/500/0 Output queue : (FIFO queuing : Size/Length/Discards) 0/75/0 Last clearing of counters: 17:14:08 Tue 05/09/2006 Last 300 seconds input rate 0.00 bytes/sec, 0 bits/sec, 0.00 packets/sec Last 300 seconds output rate 0.00 bytes/sec, 0 bits/sec, 0.00 packets/sec Input: 0 packets, 0 bytes, 0 buffers 0 broadcasts, 0 multicasts, 0 pauses 0 errors, 0 runts, 0 giants 0 crc, 0 align errors, 0 overruns 0 dribbles, 0 drops, 0 no buffers Output:0 packets, 0 bytes, 0 buffers 0 broadcasts, 0 multicasts, 0 pauses 0 errors, 0 underruns, 0 collisions 0 deferred, 0 lost carriers 3

5 Table 1 display interface (in route mode) command output description Field GigabitEthernet0/1 current state Line protocol current state Hold timer is Internet protocol processing Output queue (Urgent queue: Size/Length/Discards) Output queue (Protocol queue: Size/Length/Discards) Output queue (FIFO queuing: Size/Length/Discards) Last clearing of counters Last 300 seconds input rate Last 300 seconds output rate Input Output Current state of the Ethernet interface, which can be one of the following: DOWN ( Administratively ) The Ethernet interface was shut down with the shutdown command, that is, the interface is administratively down. DOWN ( Link-Aggregation interface down ) The Ethernet interface is physically down because the aggregate interface corresponding to the aggregation group to which the Ethernet interface belongs was shut down with the shutdown command. DOWN The Ethernet interface is administratively up but physically down (possibly because no physical link is present or the link has failed). UP The Ethernet interface is both administratively and physically up. Link layer status of the interface. When the interface is physically down, the value of this field shows as DOWN; when the interface is physically up, the value of this field shows as UP. The description of an Ethernet interface Hold timer of link state IP packet processing: disabled indicates that IP packets cannot be processed. For an interface configured with an IP address, this field changes into Internet Address is. Output queue (current message number in the urgent queue/ maximum number of messages allowed in the urgent queue/number of discarded messages) Output queue (current message number in the protocol queue/ maximum number of messages allowed in the protocol queue/number of discarded messages) Output queue (current message number in the FIFO queue/ maximum number of messages allowed in the FIFO queue/number of discarded messages) Time when the reset counters interface command was last used to clear the interface statistics. Never indicates the reset counters interface command has never been used on the current interface since the device s startup. Average input rate over the last 300 seconds: bytes/sec, bits/sec, packets/sec Average output rate over the last 300 seconds: bytes/sec, bits/sec, packets/sec Input packets Output packets # Display detailed information about Layer 2 interface GigabitEthernet 0/1. <Sysname> display interface gigabitethernet 0/1 GigabitEthernet0/1 current state: DOWN ( Administratively ) IP Packet Frame Type: PKTFMT_ETHNT_2, Hardware Address: 000f-e

6 : GigabitEthernet0/1 Interface Loopback is not set Media type is twisted pair, port hardware type is 100_BASE_TX Unknown-speed mode, unknown-duplex mode Link speed type is autonegotiation, link duplex type is autonegotiation Flow-control is not enabled The Maximum Frame Length is 1500 Broadcast MAX-ratio: 100% Unicast MAX-ratio: 100% Multicast MAX-ratio: 100% Allow jumbo frame to pass PVID: 100 Mdi type: auto Port link-type: access Tagged VLAN ID : none Untagged VLAN ID : 100 Port priority: 0 Peak value of input: bytes/sec, at :05:06 Peak value of output: 0 bytes/sec, at :00:12 Last 300 seconds input: 6 packets/sec 678 bytes/sec 20% Last 300 seconds output: 1 packets/sec 179 bytes/sec 17% Input (total): packets, bytes - unicasts, broadcasts, multicasts, 0 pauses Input (normal): packets, - bytes unicasts, broadcasts, multicasts, 0 pauses Input: 0 input errors, 0 runts, 0 giants, 0 throttles 0 CRC, 0 frame, - overruns, 0 aborts - ignored, - parity errors Output (total): packets, bytes - unicasts, 13 broadcasts, multicasts, 0 pauses Output (normal): packets, - bytes 0 unicasts, 13 broadcasts, multicasts, 0 pauses Output: 0 output errors, - underruns, 1 buffer failures 0 aborts, 0 deferred, 0 collisions, 0 late collisions 0 lost carrier, - no carrier Table 2 display interface command (in bridge mode) output description Field GigabitEthernet0/1 current state IP Packet Frame Type Loopback Unknown-speed mode unknown-duplex mode The Maximum Frame Length Physical state of the Ethernet interface. For more information, see Table 3. Ethernet framing format on the interface of the interface Loopback testing status of the interface The interface will negotiate a speed with its peer. The interface will negotiate a duplex mode with its peer. The maximum Ethernet frame length allowed on the interface 5

7 Field Broadcast-suppression ratio Unicast MAX-ratio Multicast MAX-ratio PVID Mdi type Port link-type Tagged VLAN ID Untagged VLAN ID Peak value of input Peak time of input Peak value of output Peak time of output Last 300 seconds input: 0 packets/sec 0 bytes/sec Last 300 seconds output: 0 packets/sec 0 bytes/sec Input(total): 0 packets, 0 bytes 0 broadcasts, 0 multicasts, 0 pauses Input(normal): - packets, - bytes - broadcasts, - multicasts, - pauses input errors runts giants - throttles Broadcast suppression threshold as a percentage of the interface transmission capability. When the threshold is exceeded, the interface drops broadcast packets. Unicast suppression threshold as a percentage of the interface transmission capability. When the threshold is exceeded, the interface drops unknown unicast packets. Multicast suppression threshold as a percentage of the interface transmission capability. When the threshold is exceeded, the interface drops multicast packets. Default VLAN ID Cable type Link type of the interface, which could be access, trunk, and hybrid. VLANs for which the interface sends packets without removing VLAN tags. VLANs for which the interface sends packets after removing VLAN tags Peak value of inbound traffic, in bytes/sec. Time of peak inbound traffic Peak value of outbound traffic, in bytes/sec. Time of peak outbound traffic Average rate of input and output traffic in the last 300 seconds, in pps and Bps Inbound traffic statistics (in packets and bytes) for the interface. All inbound normal and abnormal packets, and pause frames were counted. Inbound normal traffic and pause frame statistics (in packets and bytes) for the interface. Inbound packets with errors Inbound frames shorter than 64 bytes, in correct format, and containing valid CRCs. Inbound frames larger than the maximum frame length supported on the interface: For an Ethernet interface that does not permit jumbo frames, giants refer to frames larger than 1518 bytes (without VLAN tags) or 1522 bytes (with VLAN tags). For an Ethernet interface that permits jumbo frames, giants refer to frames larger than the maximum length of Ethernet frames that are allowed to pass through, which is configured when you configure jumbo frame support on the interface. The number of times that the port shut down due to buffer or CPU overload. 6

8 Field CRC frame - overruns aborts ignored Total number of inbound frames that had a normal length, but contained checksum errors Total number of inbound frames that contained checksum errors and a non-integer number of bytes Number of packet drops because the input rate of the port exceeded the queuing capability Total number of illegal inbound packets, including: Fragment frames: CRC error frames shorter than 64 bytes. The length can be an integral or non-integral value. Jabber frames: CRC error frames greater than the maximum frame length supported on the Ethernet interface (the frame length may or may not be integers). For an Ethernet interface that does not permit jumbo frames, jabber frames refer to CRC error frames greater than 1518 bytes (without VLAN tags) or 1522 bytes (with VLAN tags). For an Ethernet interface that permits jumbo frames, jabber frames refer to CRC error frames greater than the maximum length of Ethernet frames that are allowed to pass through the interface (which is configured when you configure jumbo frame support on the interface). Symbol error frames: Frames that contained at least one undefined symbol Unknown operation code frames: Non-pause MAC control frames Length error frames: Frames whose length fields did not accord with the actual frame length (46 bytes to 1500 bytes) Number of inbound frames dropped because the receive buffer of the port ran low. - parity errors Total number of frames with parity errors Output(total): 0 packets, 0 bytes 0 broadcasts, 0 multicasts, 0 pauses Output(normal): - packets, - bytes - broadcasts, - multicasts, - pauses output errors - underruns - buffer failures aborts deferred collisions Outbound traffic statistics (in packets and bytes) for the port. All outbound normal and abnormal packets, and pause frames were counted. Outbound normal traffic and pause frame statistics (in packets and bytes) for the interface. Outbound error packet statistics Number of packet drops because the output rate of the interface exceeded the output queuing capability. This is a low-probability hardware anomaly. Number of packets dropped because the transmit buffer of the interface ran low. Number of packets that failed to be transmitted, for example, because of Ethernet collisions. Number of frames that the interface deferred to transmit because of detected collisions. Number of frames that the interface stopped transmitting because Ethernet collisions were detected during transmission. 7

9 Field late collisions lost carrier - no carrier Number of frames that the interface deferred to transmit after transmitting their first 512 bits, because of detected collisions. Number of carrier losses during transmission. This counter applies to serial WAN interfaces. Number of times that the port failed to detect the carrier when attempting to send frames. This counter applies to serial WAN interfaces. NOTE: If an output field is not available, a hyphen (-) is displayed. Table 3 on the possible physical states of a Layer 2 Ethernet interface Field UP DOWN DOWN ( Administratively ) DOWN ( Link-Aggregation interface down ) DOWN ( OAM connection failure ) DOWN ( DLDP connection failure ) DOWN ( Loopback detection-protected ) DOWN ( BPDU-protected ) DOWN ( Monitor-Link uplink down ) The interface is physically up. The interface is physically down because no physical connection exists (possibly reason: the network cable is disconnected or faulty). The interface is physically down because it was brought down with the shutdown command. To restore its physical state, use the undo shutdown command. The interface is physically down because the aggregate interface corresponding to the aggregation group to which it belongs was shut down with the shutdown command. The interface is physically down because an OAM connection fails to be established on it or the current OAM connection is disconnected. The interface is physically down because a DLDP connection fails to be established on it or the current DLDP connection is disconnected. The interface is shut down because a loop is detected on it. The interface is shut down by the BPDU guard function. The interface is physically down because the uplink of the monitor link group to which it belongs is down. # Display the information about Layer 2 Ethernet subinterface GigabitEthernet 0/1.1. <Sysname> display interface gigabitethernet 0/1.1 gigabitethernet 0/1.1 current state: DOWN IP Sending Frames' Format: PKTFMT_ETHNT_2, Hardware Address: 000f-e : gigabitethernet 0/1.1 Interface Broadcast MAX-ratio: 100% Unicast MAX-ratio: 100% Multicast MAX-ratio: 100% PVID: 1 Port link-type: access 8

10 Tagged VLAN ID : none Untagged VLAN ID : 1 0 packets input, 0 bytes, 0 drops 0 packets output, 0 bytes, 0 drops Table 4 display interface command (in Layer 2 subinterface mode) output description Field GigabitEthernet0/1.1 current state IP Sending Frames' Format Hardware Address Broadcast MAX-ratio Unicast MAX-ratio Multicast MAX-ratio PVID Tagged VLAN ID Untagged VLAN ID Current state of the Ethernet subinterface, which can be one of the following: DOWN The Ethernet subinterface is physically down (possibly because no physical link is present or the link has failed). UP The Ethernet subinterface is physically up. Frame type of the Ethernet subinterface Interface hardware address Broadcast storm suppression ratio Unicast storm suppression ratio Multicast storm suppression ratio Default VLAN ID VLANs whose packets are sent through the port with VLAN tag kept. VLANs whose packets are sent through the port with the VLAN tag stripped off. 0 packets input, 0 bytes, 0 drops Statistics on the packets received 0 packets output, 0 bytes, 0 drops Statistics on the packets sent display interface brief Any view display interface [ interface-type [ interface-number interface-number.subnumber ] ] brief [ { begin exclude include } regular-expression ] display interface [ interface-type ] brief [ down ] [ { begin exclude include } regular-expression ] 1: Monitor level interface-type: Specifies an interface type. interface-number: Specifies an interface number. 9

11 interface-number.subnumber: Specifies a subinterface number, where interface-number is an interface number; subnumber is the number of a subinterface created under the interface. The value range of subnumber is 1 to : Uses a regular expression to filter output information. For more information about regular expressions, see Basic System Configuration in the System Volume. begin: Displays the line that matches the regular expression and all the subsequent lines. exclude: Displays the lines that do not match the regular expression. include: Displays the lines that match the regular expression. regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters. down: Displays information about interfaces in DOWN state and the relevant causes. Use the display interface brief command to display brief interface information. If no interface type is specified, this command displays information about all interfaces. If only interface type is specified, this command displays information about interfaces of the specified type. If both interface type and interface number are specified, this command displays information about the specified interface. # Display brief information about all interfaces. <Sysname> display interface brief The brief information of interface(s) under route mode: Link: ADM - administratively down; Stby - standby Protocol: (s) - spoofing Interface Link Protocol Main IP Aux0 DOWN DOWN -- GE0/0 UP UP GE0/1 DOWN DOWN -- GE0/2 UP UP NULL0 UP UP(s) -- The brief information of interface(s) under bridge mode: Link: ADM - administratively down; Stby - standby Speed or Duplex: (a)/a - auto; H - half; F - full Type: A - access; T - trunk; H - hybrid Interface Link Speed Duplex Type PVID GE0/3 DOWN auto A A 30 # Filter the brief interface information to display the line starting with the (s) string and all subsequent lines. <Sysname> display interface brief begin (s) The brief information of interface(s) under route mode: Link: ADM - administratively down; Stby - standby Protocol: (s) - spoofing Interface Link Protocol Main IP NULL0 UP UP(s) -- 10

12 When you use the begin keyword to filter output information, the system only searches the Layer 3 interface list or the Layer 2 interface list. If the starting line is on the Layer 3 interface list, the system only displays the starting line and all subsequent lines on the Layer 3 interface list. # Display brief information about all UP interfaces. <Sysname> display interface brief include UP The brief information of interface(s) under route mode: Link: ADM - administratively down; Stby - standby Protocol: (s) - spoofing Interface Link Protocol Main IP GE0/0 UP UP NULL0 UP UP(s) -- Vlan30 UP UP The brief information of interface(s) under bridge mode: Link: ADM - administratively down; Stby - standby Speed or Duplex: (a)/a - auto; H - half; F - full Type: A - access; T - trunk; H - hybrid Interface Link Speed Duplex Type PVID GE0/2 UP 100M(a) F(a) A 30 # Display the brief information about all but Ethernet interfaces. <Sysname> display interface brief exclude GE The brief information of interface(s) under route mode: Link: ADM - administratively down; Stby - standby Protocol: (s) - spoofing Interface Link Protocol Main IP Aux0 DOWN DOWN -- NULL0 UP UP(s) -- Vlan30 UP UP # Display information about interfaces in DOWN state and the relevant causes. <Sysname> display interface brief down The brief information of interface(s) under bridge mode: Link: ADM - administratively down; Stby - standby Interface Link Cause GE0/3 DOWN Not connected Table 5 display interface brief command output description Field The brief information of interface(s) under route mode: Link: ADM - administratively down; Stby - standby The command displays brief information about Layer 3 interfaces The interface has been shut down by the network administrator. To recover its physical layer state, perform the undo shutdown command. Stby indicates that the current interface is a standby interface. You can use the display standby state command to check the corresponding primary interface. 11

13 Field Protocol: (s) - spoofing Interface Link Protocol The brief information of interface(s) under bridge mode: Speed or Duplex: (a)/a - auto; H - half; F - full Type: A - access; T - trunk; H - hybrid Speed Duplex Type PVID Cause If the network layer protocol state of an interface is shown as up, but its link is an on-demand link or not present at all, its protocol attribute includes the spoofing flag (an s in parentheses). This attribute is typical of null and loopback interfaces. Interface name Physical link state of the interface: UP The link is present. DOWN The link is physically down. ADM The link has been administratively shut down. To recover its physical state, perform the undo shutdown command. Stby The interface is a standby interface. Protocol connection state of the interface, which can be up or down. If the network layer protocol state of the interface is up, but its link is an on-demand link or not present at all, its protocol attribute includes the spoofing flag (an s in parentheses). Brief information about Layer 2 interfaces If the speed of an interface is automatically negotiated, its speed attribute includes the auto negotiation flag, letter a in parentheses. If the duplex mode of an interface is automatically negotiated, its duplex mode attribute includes the auto negotiation flag, letter a in parentheses or a capital A. Letter H indicates the half duplex mode, and letter F indicates the full duplex mode. Link type options for Ethernet interfaces Interface rate, in bps Duplex mode of the interface: A auto-negotiation F full duplex F(a) auto-negotiated full duplex H half duplex H(a) auto-negotiated half duplex Link type of the interface: A access H hybrid T trunk Default VLAN ID of the interface Causes why the physical state of an interface is DOWN. For more information, see Table 6. 12

14 Table 6 Causes why the physical state of an interface is DOWN Field Not connected Administratively Link-Aggregation interface down OAM connection failure DLDP connection failure Loopback detection-protected BPDU-protected Monitor-Link uplink down No physical connection exists (possibly because the network cable is disconnected or faulty). The port was brought down with the shutdown command. To restore the physical state of the interface, use the undo shutdown command. The aggregate interface corresponding to the aggregation group to which the current interface belongs was shut down with the shutdown command. OAM connection fails (possibly because the connection fails to be established or the current connection is disconnected). DLDP connection fails (possibly because the connection fails to be established or the current connection is disconnected). The interface is shut down because a loop is detected on it. The interface is shut down by the BPDU guard function. The uplink of the current monitor link group to which the current interface belongs is down. duplex duplex { auto full half } undo duplex Ethernet interface view auto: Sets the interface to operate in auto-negotiation mode. full: Sets the interface to operate in full duplex mode. half: Sets the interface to operate in half-duplex mode. This keyword is not available for the optical ports of Combo interfaces. Use the duplex command to set the duplex mode for an Ethernet interface. Use the undo duplex command to restore the default duplex mode of the Ethernet interface. By default, Ethernet interfaces operate in auto-negotiation mode. Related commands: speed. # Configure interface GigabitEthernet 0/1 to operate in full-duplex mode. 13

15 interface [Sysname-GigabitEthernet0/1] duplex full interface interface-type { interface-number interface-number.subnumber } System view interface-type: Specifies and interface type. interface-number: Specifies an interface number. interface-number.subnumber: Specifies a subinterface number, where interface-number is an interface number, and subnumber is the number of a subinterface created under the interface. The subnumber argument ranges from 1 to Use the interface command to enter interface/subinterface view. With the interface-number.subnumber argument specified, if the subinterface identified by the argument does not exist, this command creates the subinterface first, and then enters subinterface view. loopback # Enter GigabitEthernet 0/0 interface view (assuming that the interface is a Layer 3 Ethernet interface). [Sysname] interface gigabitethernet 0/0 [Sysname-GigabitEthernet0/0] # Create Ethernet subinterface GigabitEthernet 0/0.1 and enter GigabitEthernet 0/0.1 subinterface view (assuming that GigabitEthernet 0/0 is an Layer 3 Ethernet interface and the subinterface does not exist). [Sysname] interface gigabitethernet 0/0.1 [Sysname-GigabitEthernet0/0.1] loopback { external internal } undo loopback Ethernet interface view 14

16 external: Enables external loopback testing to test all on-chip functions related to Ethernet interfaces. internal: Enables internal loopback testing to test the hardware of Ethernet interfaces. Use the loopback command to enable loopback testing on an Ethernet interface. Use the undo loopback command to disable Ethernet interface loopback testing on an Ethernet interface. By default, loopback testing is disabled on Ethernet interfaces. NOTE: You enable loopback testing for troubleshooting purposes, such as identifying an Ethernet problem. You can perform neither internal nor external loopback testing on an administratively down (ADM DOWN) port. On a physically down (DOWN) port, you can perform only internal loopback testing. During loopback testing, the speed, duplex, mdi, and shutdown commands are not available. In addition, the port is operating in full duplex mode, regardless of its duplex configuration. After loopback testing is disabled, the duplex configuration of the port restores. # Enable internal loopback testing on GigabitEthernet 0/1. [Sysname-GigabitEthernet0/1] loopback internal port link-mode port link-mode { bridge route } undo port link-mode Ethernet interface view bridge: Specifies the Layer 2 mode. route: Specifies the Layer 3 mode. Use the port link-mode command to change the working mode of the Ethernet interface. 15

17 Use the undo port link-mode command to restore the default. Depending on the hardware structure of interface cards, for a device, some interfaces can operate only as Layer 2 Ethernet interfaces (in bridge mode), some can operate only as Layer 3 Ethernet interfaces (in route mode), while others can operate either as Layer 2 or Layer 3 Ethernet interfaces (you can use commands to set the operating mode to bridge or route). CAUTION: After you change the operating mode of an Ethernet interface, all the settings of the Ethernet interface are restored to their defaults under the new operating mode. # Configure GigabitEthernet 0/1 to operate in Layer 2 mode. [Sysname-GigabitEthernet0/1] display this # interface GigabitEthernet0/1 port link-mode route # Return The preceding output shows that GigabitEthernet 0/1 operates in route mode. [Sysname-GigabitEthernet0/1] port link-mode bridge [Sysname-GigabitEthernet0/1] display this # interface GigabitEthernet0/1 port link-mode bridge # Return The preceding output shows that GigabitEthernet 0/1 is now operating in bridge mode. NOTE: The display this command displays the configuration that takes effect in the current view. reset counters interface reset counters interface [ interface-type [ interface-number interface-number.subnumber ] ] User view interface-type: Specifies an interface type. interface-number: Specifies an interface number. 16

18 interface-number.subnumber: Subinterface number, where interface-number is an interface number; subnumber is the number of a subinterface created under the interface. The value of subnumber ranges from 1 to Use the reset counters interface command to clear the statistics of an interface/subinterface. Before collecting traffic statistics for a specific period of time on an interface, clear the old statistics first. If no interface type is specified, this command clears statistics for all interfaces. If only the interface type is specified, this command clears statistics for all interfaces of the specified interface type. If both the interface type and interface/subinterface number are specified, this command clears statistics for the specified interface/subinterface. shutdown # Clear the statistics of GigabitEthernet 0/1. <Sysname> reset counters interface gigabitethernet 0/1 # Clear the statistics of subinterface GigabitEthernet 0/1.1. <Sysname> reset counters interface gigabitethernet 0/1.1 shutdown undo shutdown Ethernet interface view, Ethernet subinterface view None Use the shutdown command to shut down an Ethernet interface/subinterface. Use the undo shutdown command to bring up an Ethernet interface/subinterface. By default, an Ethernet interface/subinterface is in the up state. You may need to shut down and then bring up an Ethernet interface to activate configuration changes in certain circumstances, for example, after modifying the operating parameters of the interface. The electrical and optical ports of a Combo interface cannot work simultaneously. When you bring up the optical port with the undo shutdown command, the electrical port is automatically shut down, and vice versa. # Shut down and then bring up interface GigabitEthernet 0/1. 17

19 speed [Sysname-GigabitEthernet0/1] shutdown [Sysname-GigabitEthernet0/1] undo shutdown # Shut down and then bring up subinterface GigabitEthernet 0/ [Sysname-GigabitEthernet0/1.1] shutdown [Sysname-GigabitEthernet0/1.1] undo shutdown speed { auto } undo speed Ethernet interface view 10: Sets the interface speed to 10 Mbps. The optical port of a Combo interface does not support the 10 keyword. 100: Sets the interface speed to 100 Mbps. The optical port of a Combo interface does not support the 100 keyword. 1000: Sets the interface speed to 1,000 Mbps. auto: Enables the interface to negotiate a speed with its peer. Use the speed command to set the speed of an Ethernet interface. Use the undo speed command to restore the default. For an Ethernet electrical port, you use the speed command to set its speed to match the speed of the peer interface. For an optical port, you use the speed command to set its speed to match the rate of a pluggable optical transceiver. Related commands: duplex, speed auto. # Configure interface GigabitEthernet 0/1 to operate at 100 Mbps. [Sysname-GigabitEthernet0/1] speed 100 sub-interface rate-statistic sub-interface rate-statistic 18

20 undo sub-interface rate-statistic Ethernet interface view None Use the sub-interface rate-statistic command to enable rate statistics collection for the subinterfaces of an Ethernet interface. Use the undo sub-interface rate-statistic command to disable rate statistics collection for the subinterfaces of an Ethernet interface. By default, the system does not collect rate statistics for Ethernet subinterfaces. NOTE: Use this function with caution, because it requires a large amount of system resources. # Enable rate statistics collection on the subinterfaces of GigabitEthernet 0/1. [Sysname- GigabitEthernet0/1] sub-interface rate-statistic Layer 2 Ethernet Interface/Subinterface Configuration Commands broadcast-suppression (Ethernet interface view/ethernet sub-interface view) broadcast-suppression ratio undo broadcast-suppression Layer 2 Ethernet interface view, Layer 2 Ethernet subinterface view ratio: Sets the broadcast suppression threshold as a percentage of the transmission capability of an Ethernet interface. The smaller the percentage, the less broadcast traffic is allowed to pass through. 19

21 For devices that support linear suppression mode, this argument ranges from 1 to 100. The system default is 100. For devices that do not support linear suppression mode, this argument ranges from 5 to 100. The system default is 100. Use the broadcast-suppression command to set the broadcast suppression threshold on an Ethernet interface/subinterface. Use the undo broadcast-suppression command to restore the default. By default, Ethernet interfaces do not suppress broadcast traffic. When broadcast traffic exceeds the broadcast suppression threshold, the interface discards broadcast packets until the broadcast traffic drops below the threshold. NOTE: If you set different broadcast suppression thresholds in Ethernet interface view multiple times, the one configured last takes effect. # Set the broadcast suppression threshold to 20% on Ethernet interface GigabitEthernet 0/1. [Sysname-GigabitEthernet0/1] broadcast-suppression 20 # Set the broadcast suppression threshold to 20% on Ethernet subinterface GigabitEthernet 0/ [Sysname-GigabitEthernet0/1.1] broadcast-suppression 20 jumboframe enable jumboframe enable [ value ] undo jumboframe enable Layer 2 Ethernet interface view value: Sets the maximum length of Ethernet frames that are allowed to pass through, in bytes, in the range of 64 to If you set the value argument multiple times, the latest configuration takes effect. Use the jumboframe enable command to allow jumbo frames within the specified length to pass through an Ethernet interface. 20

22 Use the undo jumboframe enable command to prevent jumbo frames from passing through an Ethernet interface. By default, the device allows jumbo frames within a specified length to pass through Layer 2 Ethernet interfaces. # Enable jumbo frames to pass through GigabitEthernet 0/1. [Sysname-GigabitEthernet0/1] jumboframe enable mdi mdi { across auto normal } undo mdi Layer 2 Ethernet interface view across: Sets the MDI mode to across. In this mode, pins 1 and 2 of the port are receive pins, and pins 3 and 6 are transmit pins. auto: Sets the MDI mode to auto. In this mode, the port negotiates pin roles with its peer. normal: Sets the MDI mode to normal. In normal mode, pins 1 and 2 of the port are transmit pins, and pins 3 and 6 are receive pins. Use the mdi command to configure the MDI mode of a copper Ethernet interface. Use the undo mdi command to restore the default. By default, Ethernet interfaces operate in auto MDI mode. NOTE: This command is not applicable to optical ports. # Set interface GigabitEthernet 0/1 to operate in across MDI mode. [Sysname-GigabitEthernet0/1] mdi across 21

23 multicast-suppression (Ethernet interface view/ethernet sub-interface view) multicast-suppression ratio undo multicast-suppression Layer 2 Ethernet interface view, Layer 2 Ethernet subinterface view ratio: Sets the multicast suppression threshold as a percentage of the transmission capability of an Ethernet interface, in the range 1 to 100. The smaller the percentage, the less multicast traffic is allowed to pass through. Use the multicast-suppression command to set the multicast suppression threshold on an Ethernet interface/subinterface. Use the undo multicast-suppression command to restore the default. By default, Ethernet interfaces do not suppress multicast traffic. When multicast traffic exceeds the threshold you configure, the system discards multicast packets until the multicast traffic drops below the threshold. # Set the multicast threshold to 20% on Ethernet interface GigabitEthernet 0/1. [Sysname-GigabitEthernet0/1] multicast-suppression 20 # Set the multicast threshold to 20% on Ethernet subinterface GigabitEthernet 0/ [Sysname-GigabitEthernet0/1.1] multicast-suppression 20 unicast-suppression (Ethernet interface view/ethernet sub-interface view) unicast-suppression ratio undo unicast-suppression Layer 2 Ethernet interface view, Layer 2 Ethernet subinterface view 22

24 ratio: Sets the unknown unicast suppression threshold as a percentage of the transmission capability of the Ethernet interface, in the range of 1 to 100. The smaller the percentage, the less unknown unicast traffic is allowed through. Use the unicast-suppression command to set the unknown unicast suppression threshold on an Ethernet interface/subinterface. Use the undo unicast-suppression command to restore the default. By default, Ethernet interfaces do not suppress unknown unicast traffic. When unknown unicast traffic exceeds the threshold you configure, the system discards unknown unicast packets until the unknown unicast traffic drops below the threshold. # Set the unknown unicast threshold to 20% on Ethernet interface GigabitEthernet 0/1. [Sysname-GigabitEthernet0/1] unicast-suppression 20 # Set the unknown unicast threshold to 20% on Ethernet subinterface GigabitEthernet 0/ [Sysname-GigabitEthernet0/1.1] unicast-suppression 20 Layer 3 Ethernet Interface/Subinterface Configuration Commands mtu mtu size undo mtu Layer 3 Ethernet interface view, Layer 3 Ethernet subinterface view size: Maximum Transmission Unit (MTU) to be set (in bytes), whose range varies by interface types. The system default is 1500 bytes. Use the mtu command to set the MTU for an Ethernet interface/subinterface. 23

25 Use the undo mtu command to restore the default. NOTE: As the size of MTU decreases, the number of fragments grows. When setting MTU for an interface, you should consider QoS queue lengths (for example, the default FIFO queue length is 75) to avoid a too small MTU causing packet drop in QoS queuing. To achieve the best result, you can tune MTU with the mtu command or QoS queue lengths with the qos fifo queue-length command. For detailed configurations, see QoS Commands in the QoS Volume. # Set the MTU to 1430 bytes for the Layer 3 Ethernet interface GigabitEthernet 0/0. [Sysname] interface gigabitethernet 0/0 [Sysname-GigabitEthernet0/0] mtu 1430 # Set the MTU to 1680 bytes for the Layer 3 Ethernet subinterface GigabitEthernet 0/0.1. [Sysname] interface gigabitethernet 0/0.1 [Sysname-GigabitEthernet0/0.1] mtu 1680 promiscuous promiscuous undo promiscuous Layer 3 Ethernet interface view None Use the promiscuous command to configure a Layer 3 Ethernet interface to operate in promiscuous mode. Use the undo promiscuous command to cancel the promiscuous operating mode. By default, a Layer 3 Ethernet interface does not operate in promiscuous mode. # Configure GigabitEthernet 0/0 to operate in promiscuous mode. [Sysname] interface gigabitethernet 0/0 [Sysname-GigabitEthernet0/0] promiscuous 24