Basic MPLS commands. display mpls forwarding ilm. Syntax. Views. Predefined user roles. Parameters. Usage guidelines. Examples

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1 Contents Basic MPLS commands 1 display mpls forwarding ilm 1 display mpls forwarding nhlfe 2 display mpls interface 4 display mpls label 5 display mpls lsp 6 display mpls lsp statistics 10 display mpls nid 11 display mpls summary 12 display mpls statistics 13 mpls enable 15 mpls label advertise 16 mpls lsr-id 17 mpls mtu 17 mpls ttl expiration enable 18 mpls ttl propagate 19 i

2 Basic MPLS commands The switch operates in IRF or standalone (the default) mode. For more information about IRF, see IRF Configuration Guide. display mpls forwarding ilm Use display mpls forwarding ilm to display Incoming Label Map (ILM) entries. In standalone mode: display mpls forwarding ilm [ label ] slot slot-number In IRF mode: display mpls forwarding ilm [ label ] chassis chassis-number slot slot-number Any view network-operator mdc-operator Parameters label: Displays the ILM entry with the specified incoming label. The value range for the incoming label is 16 to If you do not specify an incoming label, the command displays information about all ILM entries on the specified card. slot slot-number: Specifies a card by its slot number. (In standalone mode.) chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument specifies the ID of the IRF member device, and the slot-number argument specifies the number of the slot that holds the card. (In IRF mode.) An ILM entry records the label operation type, outgoing label, and other forwarding information. After an LSR receives a labeled packet, it identifies the ILM entry that matches the top label of the packet, performs the specified label operation, and forwards the packet. # Display the ILM entry with incoming label 30. <Sysname> display mpls forwarding ilm 30 Flags: T - Forwarded through a tunnel N - Forwarded through the outgoing interface to the nexthop IP address B - Backup forwarding information A - Active forwarding information 1

3 InLabel Oper VRF Flag SwapLabel Forwarding Info SWAP 0 T # Display all ILM entries. <Sysname> display mpls forwarding ilm Total ILM entries: 3 Flags: T - Forwarded through a tunnel N - Forwarded through the outgoing interface to the nexthop IP address B - Backup forwarding information A - Active forwarding information InLabel Oper VRF Flag SwapLabel Forwarding Info SWAP 0 T POP SWAP 0 NA 1271 GE3/0/ NB 1270 Tun Table 1 Command output Field Total ILM entries InLabel Oper VRF Flag SwapLabel Forwarding Info Description Total number of ILM entries. Incoming label. Operation type: POP Pops the label. POPGO Pops the label and forwards the packet to another tunnel. SWAP Swaps the label. Index of a VPN instance. Forwarding flag: T Forwarded through a tunnel. N Forwarded through the outgoing interface to the nexthop IP address. B Backup forwarding information. A Active forwarding information. Outgoing label value. Forwarding information: When the forwarding flag is N, the forwarding information records the outgoing interface and the next hop. When the forwarding flag is T, the forwarding information records the NID. display mpls forwarding nhlfe Use display mpls forwarding nhlfe to display Next Hop Label Forwarding Entry (NHLFE) entries. 2

4 In standalone mode: display mpls forwarding nhlfe [ nid ] slot slot-number In IRF mode: display mpls forwarding nhlfe [ nid ] chassis chassis-number slot slot-number Any view network-operator mdc-operator Parameters nid: Displays the NHLFE entry with the specified NID. The value range for the NID is 0 to If you do not specify an NID, the command displays information about all NHLFE entries on the specified card. slot slot-number: Specifies a card by its slot number. (In standalone mode.) chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument specifies the ID of the IRF member device, and the slot-number argument specifies the number of the slot that holds the card. (In IRF mode.) An NHLFE entry records label forwarding information, such as the outgoing label and outgoing interface. NHLFE entries are mainly used to add multiple labels to packets. To add multiple labels to a packet, an LSR first obtains the bottom label and NID in the matching FIB or ILM entry, and then obtains the outer label in the NHLFE entry identified by the NID. # Display the NHLFE entry with NID <Sysname> display mpls forwarding nhlfe 2048 Flags: T - Forwarded through a tunnel N - Forwarded through the outgoing interface to the nexthop IP address B - Backup forwarding information A - Active forwarding information NID Tnl-Type Flag OutLabel Forwarding Info LSP NA 2025 GE3/0/ # Display all NHLFE entries. <Sysname> display mpls forwarding nhlfe Total NHLFE entries: 5 Flags: T - Forwarded through a tunnel N - Forwarded through the outgoing interface to the nexthop IP address 3

5 B - Backup forwarding information A - Active forwarding information NID Tnl-Type Flag OutLabel Forwarding Info TA TA LSP NA 2025 GE3/0/ LSP NA 3024 GE3/0/ TB LSP NA 3025 GE3/0/ Table 2 Command output Field Total NHLFE entries NID Tnl-Type Flag OutLabel Forwarding Info Description Total number of NHLFE entries. NHLFE entry index. Tunnel type: LSP, GRE, or CRLSP. If the tunnel type is an invalid value, this field displays a hyphen (-). Forwarding flag: T Forwarded through a tunnel. N Forwarded through the outgoing interface to the nexthop IP address. B Backup forwarding information. A Active forwarding information. Outgoing label. Forwarding information: When the forwarding flag is N, the forwarding information records the outgoing interface and the next hop. When the forwarding flag is T, the forwarding information records the NID. display mpls interface Use display mpls interface to display MPLS interface information, including the interface name, interface status, and interface MPLS MTU. display mpls interface [ interface-type interface-number ] Any view network-operator mdc-operator 4

6 Parameters interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, the command displays MPLS information for all MPLS-enabled interfaces. # Displays all MPLS interfaces. <Sysname> display mpls interface Interface Status MPLS MTU GE3/0/1 Up 1514 GE3/0/2 Up 1514 The MPLS MTU of an interface is in bytes. Related commands mpls enable mpls mtu display mpls label Use display mpls label to display MPLS label usage information. display mpls label { label-value1 [ to label-value2 ] all } Any view network-operator mdc-operator Parameters label-value1: Specifies a label in the range of 16 to If used with the label-value2 argument, the label-value1 argument represents the start label of a label range. to label-value2: Specifies the end label in the range of 16 to If you specify a label range by using the label-value1 argument and the to label-value2 option, the command displays usage information for the specified range of labels. all: Specifies all labels. # Display the usage information of labels 900 through 902. <Sysname> display mpls label 900 to 902 Label Owner State Idle Idle 902 LDP Alloc 5

7 Table 3 Command output Field Label Owner State Description Label value. Protocol that is using the label. Possible values include LDP, BGP, RSVP, and L2VPN. Usage state of the label: Idle The label is idle. Alloc The label has been allocated. Pending The label has been released but is still used by an LSP entry. Inuse The label has been allocated and used by an LSP entry. display mpls lsp Use display mpls lsp to display LSP information. display mpls lsp [ egress in-label label-value ingress outgoing-interface interface-type interface-number protocol { bgp ldp local rsvp-te static static-cr } transit ] [ vpn-instance vpn-instance-name ] [ ipv4-dest mask-length ipv6 [ ipv6-dest prefix-length ] ] [ verbose ] Any view network-operator mdc-operator Parameters egress: Displays the LSPs taking the current LSR as the egress. in-label label-value: Displays the LSPs using the specified label as the incoming label. The value range for the label-value argument is 0 to ingress: Displays the LSPs taking the current LSR as the ingress. outgoing-interface interface-type interface-number: Displays the LSPs using the specified interface as the outgoing interface. The interface-type interface-number argument specifies an interface by its type and number. protocol: Displays the LSPs established by a specific protocol. bgp: Displays BGP LSPs. Ldp: Displays LDP LSPs. local: Displays the direct LSP. rsvp-te: Displays CR-LSPs established by RSVP-TE. The switch does not support this keyword. 6

8 static: Displays static LSPs. static-cr: Displays static CR-LSPs. The switch does not support this keyword. transit: Displays the LSPs taking the current LSR as a transit LSR. vpn-instance vpn-instance-name: Displays LSPs for the specified VPN. The vpn-instance-name is a case-sensitive string of 1 to 31 characters. If you do not specify this option, the command displays LSPs for the public network. ipv4-dest mask-length: Displays the IPv4 LSP for a FEC specified by an IPv4 address and a mask length. The value range for the mask length is 0 to 32. ipv6: Displays IPv6 LSP information. If you do not specify this keyword, the command displays IPv4 LSP information. ipv6-dest prefix-length: Displays the IPv6 LSP for a FEC specified by an IPv6 address and a prefix length. The value range for the prefix length is 0 to 128. verbose: Displays detailed LSP information. If you do not specify this keyword, the command displays brief LSP information. If no parameters are specified, the command displays brief information for all LSPs. If you specify only the verbose keyword, the command displays detailed information for all LSPs. # Display brief information for all IPv4 LSPs. <Sysname> display mpls lsp FEC Proto In/Out Label Interface/Out NHLFE /24 LDP -/1049 Vlan20 Backup -/1050 Vlan /24 LDP -/1051 Vlan22 Backup -/1050 Vlan /24 LDP -/1049 Vlan /24 LDP 1026/1049 Vlan /24 LDP 1027/ /24 LDP 1028/1049 Tunnel /24 BGP -/1049 Vlan /24 BGP 2028/1049 Vlan /24 BGP 2029/- Vlan /24 BGP 2030/1049 NHLFE /24 BGP 2031/1050 Tunnel Local -/- Vlan /32 Static -/100 Vlan20 - Static 100/200 Vlan20 - Static 101/- Vlan /64000/64000 RSVP -/1030 Vlan /64000/64000 RSVP 1024/1031 Vlan /64000/64000 RSVP 1025/ /64001/0 StaticCR -/1000 Vlan10 - StaticCR 50/1001 Vlan10 - StaticCR 51/- - 7

9 Table 4 Command output Field FEC Proto In/Out Label Interface/Out NHLFE Description Forwarding equivalence class: IP address/mask Classifies FECs by destination address. IP address Classifies FECs by next hop. IP address/out Label Classifies FECs by next hop and outgoing label. Ingress LSR ID/Tunnel ID/LSP ID RSVP TE FEC. A hyphen (-) The LSP is a static transit LSP, static egress LSP, static transit CR-LSP, or static egress CR-LSP. Backup If the LSP is a backup LSP of the previous LSP, this field displays "Backup." Label distribution protocol: LDP. BGP. RSVP. Static. StaticCR Static CR-LSP. Local The LSP is a direct LSP. Incoming label/outgoing label. Outgoing interface name or NHLFE entry index. NHLFEnumber specifies the outer LSP that carries the current LSP. The outer LSP is that matches the NHLFE entry with an NID of number. # Display IPv6 LSP information. <Sysname> display mpls lsp ipv6 FEC : 100:100:100:100:100:100:100:100/128 Protocol : BGP In-Label : 2050 Out-Label: BkLabel : Out-Interface: Vlan10 BkInterface : Vlan20 Table 5 Command output Field FEC Description Forwarding equivalence class: IP address/mask Classifies FECs by destination address. IP address Classifies FECs by next hop. IP address/out Label Classifies FECs by next hop and outgoing label. Ingress LSR ID/Tunnel ID/LSP ID RSVP TE FEC. A hyphen (-) The LSP is a static transit LSP, static egress LSP, static transit CR-LSP, or static egress CR-LSP. 8

10 Field Protocol BkLabel BkInterface Description Label distribution protocol: LDP. BGP. RSVP. Static. StaticCR Static CR-LSP. Local Direct LSP. Outgoing label of the backup LSP. Outgoing interface of the backup LSP. # Display detailed information for all LSPs. <Sysname> display mpls lsp verbose Destination : FEC : /32 Protocol : LDP LSR Type : Egress Service : - In-Label : 1024 State : Active Destination : FEC : /32 Protocol : LDP LSR Type : Transit Service : - In-Label : 1026 Path ID : 0x State : Active Out-Label : 1800 Nexthop : Out-Interface: Vlan10 BkLabel : 1900 BkNexthop : BkInteface : Vlan20 Destination : FEC : /32 Protocol : LDP LSR Type : Ingress Service : - NHLFE ID : 2000 State : Active Out-Label : 1800 Nexthop : Out-Interface: Vlan10 9

11 Table 6 Command output Field Destination FEC Proto LSR Type Service Path ID NHLFE ID Outgoing NID State BkLabel BkNexthop BkInterface Description LSP destination address. Forwarding equivalence class: IP address/mask Classifies FECs by destination address. IP address Classifies FECs by next hop. IP address/out Label Classifies FECs by next hop and outgoing label. Ingress LSR ID/Tunnel ID/LSP ID RSVP TE FEC. A hyphen (-) The LSP is a static transit LSP, static egress LSP, static transit CR-LSP, or static egress CR-LSP. Label distribution protocol: LDP. BGP. RSVP. Static. StaticCR Static CR-LSP. Local Direct LSP. LSR type: Ingress The current LSR is the ingress node of the LSP. Transit The current LSR is a transit node of the LSP. Egress The current LSR is the egress node of the LSP. Service deployed on the LSP. Forwarding path. The value is in the format of 0xnn.m, where nn represents the NHLFE group ID of the outer LSPs that carry the current LSP, and m represents the sequence number of the equivalence path. NHLFE entry index. Index of the NHLFE entry for the outer tunnel. LSP state: Active The LSP is in use. Inactive The LSP is idle. Outgoing label of the backup LSP. Next hop address of the backup LSP. Outgoing interface of the backup LSP. Related commands display mpls lsp statistics display mpls lsp statistics Use display mpls lsp statistics to display LSP statistics. display mpls lsp statistics 10

12 Any view network-operator mdc-operator # Display LSP statistics. <Sysname> display mpls lsp statistics LSP Type Ingress/Transit/Egress Active Static LSP 0/0/0 0/0/0 Static CRLSP 0/0/0 0/0/0 LDP LSP 2/2/1 2/2/1 RSVP CRLSP 0/0/0 0/0/0 BGP LSP 0/0/0 0/0/0 Local LSP 2/0/0 2/0/ Total 4/2/1 4/2/1 Table 7 Command output Field LSP Type Total Ingress Transit Egress Active Description LSP types: Static LSP. Static CRLSP. LDP LSP. Local LSP (direct LSP). RSVP CRLSP. BGP LSP. Total number of LSPs. Number of LSPs that take the local device as the ingress node. Number of LSPs that take the local device as a transit node. Number of LSPs that take the local device as the egress node. Number of active LSPs of a specific type. display mpls nid Use display mpls nid to display the NID usage information. display mpls nid [ nid-value1 [ to nid-value2 ] ] 11

13 Any view network-operator mdc-operator Parameters nid-value1: Specifies an NID in the range of 0 to If used with the nid-value2 argument, the nid-value1 argument represents the start NID of an NID range. to nid-value2: Specifies the end NID in the range of 0 to If you specify an NID range by using the nid-value1 argument and the to nid-value2 option, the command displays the usage information for the specified range of NIDs. If you do not specify any parameter, the command displays the usage information of all NIDs. # Display the usage information of NIDs 1028 through <Sysname> display mpls nid 1028 to 1500 NID alloc state: '.' means not used, '$' means used 1028 :...$ : : : : : : : display mpls summary Use display mpls summary to display MPLS summary information. display mpls summary Any view network-operator mdc-operator 12

14 # Display MPLS summary information. <Sysname> display mpls summary Memory State : Normal MPLS LSR ID : Egress Label Type: Implicit-null Labels: Range Idle Protocols: Type State BGP Normal Static Normal Table 8 Command output Field Memory State Egress Label Type Labels Range Idle Protocols Type State Description Memory state: Normal The memory is normal. Minor The memory has a minor alarm. Severe The memory has a severe alarm. Critical The memory has a critical alarm. Label type that the egress assigns to the penultimate hop: Implicit-null. Explicit-null. Non-null. Label information. Label range. Number of idle labels in the label range. Running label distribution protocols and the related information. Protocol type: LDP, BGP, RSVP, Static, Static CRLSP, or TE. Label distribution protocol running status: Normal. Recover The protocol is in the GR process. display mpls statistics Use display mpls statistics to display MPLS forwarding statistics for each LSP, such as the number of packets processed and dropped in the inbound and outbound directions. display mpls statistics { all lsp-index index } 13

15 Any view network-operator mdc-operator Parameters all: Displays MPLS forwarding statistics for all LSPs. lsp-index index: Displays MPLS forwarding statistics for the specified LSP. The index argument represents the index of an LSP, in the range of 1 to To use this command to view MPLS forwarding statistics for LSPs, you must first enable MPLS forwarding statistics for LSPs by using the mpls statistics command. Otherwise, the statistics are all 0. # Display MPLS forwarding statistics for all LSPs. <Sysname> display mpls statistics all Statistics for LSP (LSP index: 9218): Inbound: Octets : 0 Packets : 0 Errors : 0 Discards : 0 Start Time : 2006/05/20 15:52:30 End Time : 2006/05/20 15:52:30 Outbound: Octets : 0 Packets : 0 Errors : 0 Discards : 0 Start Time : 0000/00/00 00:00:00 End Time : 0000/00/00 00:00:00 Statistics for LSP (LSP index: 9219): Inbound: Octets : 0 Packets : 0 Errors : 0 Discards : 0 Start Time : 0000/00/00 00:00:00 End Time : 0000/00/00 00:00:00 Outbound: Octets : 0 Packets : 0 Errors : 0 14

16 Discards : 0 Start Time : 2006/05/20 15:52:30 End Time : 2006/05/20 15:52:30 Table 9 Command output Field Statistics for LSP (LSP index: index) Inbound Outbound Octets Packets Errors Discards Start Time End Time Description MPLS forwarding statistics for the LSP identified by the index. Inbound direction. Outbound direction. Bytes of packets processed. Number of packets processed. Number of errors. Number of packets discarded. Start time of the statistics. End time of the statistics. NOTE: On an ingress node, no statistics are collected in the inbound direction and the start time and end time for inbound statistics are both 0. Related commands On an egress node, no statistics are collected in the outbound direction and the start time and end time for outbound statistics are both 0. mpls statistics mpls enable Default Use mpls enable to enable MPLS on an interface. Use undo mpls enable to disable MPLS on an interface. mpls enable undo mpls enable MPLS is disabled on an interface. Interface view Execute this command on all interfaces that need to perform MPLS forwarding. 15

17 # Enable MPLS on VLAN-interface 2. <Sysname> System-view [Sysname] interface vlan-interface 2 [Sysname-Vlan-interface2] mpls enable Related commands display mpls interface mpls label advertise Default Use mpls label advertise to specify the type of label the egress will advertise to the penultimate hop. Use undo mpls label advertise to restore the default. mpls label advertise { explicit-null implicit-null } undo mpls label advertise As an egress, the device advertises an implicit null label to the penultimate hop. System view Parameters explicit-null: Specifies the egress to advertise an explicit null label of 0 to the penultimate hop. implicit-null: Specifies the egress to advertise an implicit null label of 3 to the penultimate hop. If the penultimate hop supports PHP, H3C recommends that you configure the egress to advertise an implicit null label to the penultimate hop. If you want to simplify packet forwarding on the egress but keep labels in packets for the egress to determine QoS policies, you can configure the egress to advertise an explicit null label to the penultimate hop. As a penultimate hop, the device allows the egress to advertise to the penultimate hop an implicit null label or an explicit null label. The mpls label advertise command takes effect only for the LSPs established after the command is executed. To apply the new setting to LSPs established before the command is executed, delete and then re-establish those LSPs: To re-establish LDP LSPs, execute the reset mpls ldp command to reset the LDP session. To re-establish BGP LSPs, delete the routes corresponding to the BGP LSPs, and then redistribute the routes. # Configure the egress device to advertise an explicit null label to the penultimate hop. <Sysname> system-view 16

18 [Sysname] mpls label advertise explicit-null Related commands reset mpls ldp mpls lsr-id Use mpls lsr-id to configure an LSR ID for the local LSR. Use undo mpls lsr-id to delete the LSR ID of the local LSR. mpls lsr-id lsr-id undo mpls lsr-id Default An LSR has no LSR ID. System view Parameters lsr-id: Specifies an ID for identifying the LSR, in dotted decimal notation. H3C recommends that you use the address of a loopback interface on the LSR as the LSR ID. # Configure the LSR ID as for the local node. <Sysname> system-view [Sysname] mpls lsr-id Related commands lsr-id mpls mtu Use mpls mtu to configure the MPLS MTU for an interface. Default Use undo mpls mtu to restore the default. mpls mtu value undo mpls mtu The MPLS MTU of an interface is not configured. Fragmentation for MPLS packets is based on the MTU of the interface, and the length of a fragment does not include that of the MPLS label. Thus, after an MPLS label is inserted into a fragment, the length of the MPLS fragment may exceed the interface MTU. 17

19 Interface view Parameters value: Specifies the MPLS MTU of the interface, in the range of 46 to bytes. This command is effective only when MPLS is enabled on the interface. If the MPLS MTU is larger than the interface MTU, data forwarding may fail. # Set the MPLS MTU of VLAN-interface 2 to 1000 bytes. <Sysname> system-view [Sysname] interface vlan-interface 2 [Sysname-Vlan-interface2] mpls enable [Sysname-Vlan-interface2] mpls mtu 1000 Related commands display mpls interface mpls ttl expiration enable Default Use mpls ttl expiration enable to enable sending of MPLS TTL-expired messages. Use undo mpls ttl expiration enable to disable the function. mpls ttl expiration enable undo mpls ttl expiration enable The MPLS TTL-expired messages sending function is enabled. System view The mpls ttl expiration enable command enables an LSR to generate an ICMP TTL-expired message upon receiving an MPLS packet with TTL being 1. If the MPLS packet has only one label, the LSR sends the ICMP TTL-expired message back to the source through IP routing. If the MPLS packet has multiple labels, the LSR forwards the ICMP TTL-expired message along the LSP of the MPLS packet to the egress, which then sends the message back to the source. 18

20 # Disable the MPLS TTL-expired messages sending function. <Sysname> system-view [Sysname] undo mpls ttl expiration enable mpls ttl propagate Default Use mpls ttl propagate to enable TTL propagation. Use undo mpls ttl propagate to disable TTL propagation. mpls ttl propagate { public vpn } undo mpls ttl propagate { public vpn } TTL propagation is enabled for public network packets and disabled for VPN packets. System view Parameters public: Specifies public network packets. vpn: Specifies VPN packets. When TTL propagation is enabled, MPLS copies the IP TTL to the label TTL for packets entering the MPLS network, and copies the label TTL to the IP TTL for packets leaving the MPLS network. If you enable TTL propagation on both the ingress and egress, the IP tracert facility can show the real path in the MPLS network. When TTL propagation is disabled, MPLS sets the label TTL to 255 for packets entering the MPLS network, and pops the label for packets leaving the MPLS network, without copying the label TTL value to the IP TTL. The IP tracert facility cannot show the real path in the MPLS network. Within an MPLS network, TTL is always copied between the labels of an MPLS packet. The mpls ttl propagate command affects only the propagation between IP TTL and label TTL. H3C recommends setting the same TTL processing mode on all LSRs of an LSP. To enable TTL propagation for a VPN, you must enable it on all PE devices in the VPN, so that you can get the same traceroute result (hop count) from those PEs. # Enable TTL propagation for VPN packets. <Sysname> system-view [Sysname] mpls ttl propagate vpn 19