Configuring Inverse Muliplexing over ATM

Transcription

1 This feature module describes how to configure Inverse Multiplexing over ATM (IMA) to transport ATM traffic over a bundle of T1 or E1 cables. This feature s the expansion of WAN bandwidth from T1 speeds, without DS3 or OC3 circuits. Finding Feature Information, on page 1 Prerequisites, on page 1 Restrictions, on page 1 Information About Inverse Muliplexing over ATM, on page 2 How to Configure IMA, on page 2 How to Configure ATM Class of Service, on page 9 Configuring Marking MPLS Experimental Bits, on page 15 Additional References, on page 21 Feature Information for Inverse Multiplexing over ATM, on page 22 Finding Feature Information Prerequisites Restrictions Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information for Inverse Multiplexing over ATM, on page 22. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to An account on Cisco.com is not required. Before testing any IMA implementation, you should terminate the T1 circuits end-to-end. The following features are not supported: Native ATM interfaces 1

2 Information About Inverse Muliplexing over ATM IP Routing VPI or VCI rewrite 1:1 and N:1 (where N > 1) VCC or VPP mode up and down traps ATM class of service (CBR, VBR-RT, VBR-nRT, UBR+, and UBR) for VPCs and port-mode Transmission of AIS on VCCs and VPCs to the customer-edge s, when the pseudowire goes down. Enabling atm cell payload scrambling for T1 Disabling atm cell payload scrambling for E1 Information About Inverse Muliplexing over ATM IMA involves inverse multiplexing and de-multiplexing of ATM cells in a cyclical fashion among physical links grouped to form a higher-bandwidth and logical link. Streams of cells are distributed in a round-robin manner across the multiple T1/E1 links and reassembled at the destination to form the original cell stream. Sequencing is provided using IMA Control Protocol (ICP) cells. The following features are supported in this release: AAl0 and AAL5 encapsulation N:1 (where N == 1) VPC and VCC cell relay mode Cell packing and Maximum Cell Packing Timeout (MCPT) timers Port mode AAL5 SDU frame encapsulation How to Configure IMA This section describes how to configure IMA on E1/T1 interface and over MPLS: Configuring ATM IMA on T1/E1 Interface To configure the ATM IMA on an E1 or T1 interface, complete the following steps: Enables privileged EXEC mode. Router> 2

3 Configuring ATM IMA over MPLS card type {t1 e1} slot/port Configures IMA on an E1 or T1 interface. Router(config)# card type e1 0 0 controller {t1 e1} slot/port Selects a T1 or E1 controller and enters controller configuration mode. Step 6 Router(config)# controller E1 0/4 ima-group ima-group-number Router(config-controller)# ima-group 0 exit Assigns the interface to an IMA group. This command creates the ATM0/IMAx interface by default. Exits the controller interface. Router(config-controller)# exit Step 7 Router(config-if)# interface ATM0/IMA0 Specifies the slot location and port of IMA interface group. ATMslot Specifies the slot location of the ATM IMA port adapter. ATMgroup-number Specifies the group number of the IMA group. Step 8 no ip address Disables the IP address configuration for the physical layer interface. Step 9 Router(config-if)# no ip address atm bandwidth dynamic Specifies the ATM bandwidth as dynamic. 0 Router(config-if)# atm bandwidth dynamic no atm ilmi-keepalive Disables the Interim Local Management Interface (ILMI) keepalive parameters. Router(config-if)# no atm ilmi-keepalive Configuring ATM IMA over MPLS This service allows the Cisco ASR 901 router to deliver ATM services over an existing MPLS network. The following sections describe how to configure transportation of service using ATM over MPLS: 3

4 Configuring the T1/E1 Controller Configuring the T1/E1 Controller Complete the following steps to configure an E1 or T1 controller: Enables privileged EXEC mode. Router> card type {t1 e1} slot port Configures the IMA on an E1 or T1 interface. Router(config)# card type e1 0 0 controller {t1 e1} slot/port Selects a T1 or E1 controller and enters controller configuration mode. Router(config)# controller E1 0/4 clock source internal Sets the clock source to internal. Step 6 Router(config-controller)# clock source internal ima-group group-number Specifies the group number for the controller. Router(config-controller)# ima-group 0 Configuring an ATM IMA Interface Complete the following steps to configure an ATM IMA interface: Enables privileged EXEC mode. 4

5 Configuring ATM over MPLS Pseudowire Interface Router> controller {t1 e1} slot/port Selects a T1 or E1 controller and enters controller configuration mode. Router(config)# controller E1 0/4 Router(config-controller)# interface ATM0/IMA0 no ip address Specifies the slot location and port of IMA interface group. ATMslot/ Specifies the slot location of the ATM IMA port adapter. /IMAgroup-number Specifies the group number of the IMA group. Disables the IP address configuration for the physical layer interface. Step 6 Router(config-if)# no ip address atm bandwidth dynamic Specifies the ATM bandwidth as dynamic. Step 7 Router(config-if)# atm bandwidth dynamic no atm ilmi-keepalive Disables the ILMI keepalive parameters. Router(config-if)# no atm ilmi-keepalive Configuring ATM over MPLS Pseudowire Interface Configuring a Port Mode Pseudowire You can configure ATM over MPLS in the following modes: A port mode pseudowire allows you to map an entire ATM interface to a single pseudowire connection. To configure, complete the following steps: Enables privileged EXEC mode. 5

6 Configuring an N-to-1 VCC Cell Mode Router> Router(config)# interface atm0/ima0 xconnect ip-address port-number encapsulation mpls Specifies the slot location and port of IMA interface group and configures the ATM interface. ATMslot Specifies the slot location of the ATM IMA port adapter. IMAgroup-number Specifies the group number of the IMA group. Binds an attachment circuit to the ATM IMA interface to create a pseudowire. Router(config-if)# xconnect encapsulation mpls Configuring an N-to-1 VCC Cell Mode An N-to-1 Virtual Channel Connection (VCC) pseudowire allows you to map a ATM VCC to a pseudowire. You must use an ATM adaptation layer (AAL) encapsulation for this transport type. To configure, complete the following steps: Enables privileged EXEC mode. Router> Router(config)# interface ATM0/IMA0 Specifies the slot location and port of IMA interface group and configures the ATM interface. 6

7 Configuring an N-to-1 vpc Cell Mode ATMslot Specifies the slot location of the ATM IMA port adapter. ATMgroup-number Specifies the group number of the IMA group. pvc VPI/VCI l2transport Router(config-if)# 100/12 l2transport encapsulation encapsulation-type Specifies the Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) of the Permanent Virtual Circuit (PVC) and configures them in layer 2 transport mode. Sets the encapsulation type to AAL0 Step 6 Router(config-if-atm-l2trans-)# encapsulation aal0 xconnect ip-address port-number encapsulation mpls one-to-one Binds an attachment circuit to the ATM IMA interface to create a pseudowire. Router(config-if-atm-l2trans-)# xconnect encapsulation mpls Configuring an N-to-1 vpc Cell Mode An N-to-1 virtual port channel (vpc) pseudowire allows you to map one or more vpcs to a single pseudowire. You must use ATM Adaptation Layer (AAL) encapsulation for this transport type. To configure, complete the following steps: Enables privileged EXEC mode. Router> Router(config)# interface ATM0/IMA0 Specifies the slot location and port of IMA interface group and configures the ATM interface. ATMslot Specifies the slot location of the ATM IMA port adapter. 7

8 ATM AAL5 SDU VCC Transport atm pvp VPI l2transport IMAgroup-number Specifies the group number of the IMA group. Specifies the VPI of the PVP and configures the PVP in L2transport mode. Router(config-if)# atm pvp 10 l2transport xconnect ip-address port-number encapsulation mpls one-to-one Binds an attachment circuit to the ATM IMA interface to create a pseudowire. Router(config-if-atm-l2trans-pvp)# xconnect encapsulation mpls ATM AAL5 SDU VCC Transport An ATM AAL5 SDU VCC transport pseudowire maps a single ATM to another ATM. You must use AAL5 encapsulation for this transport type. Complete the following steps to configure an ATM AAL5 SDU VCC transport pseudowire: Enables privileged EXEC mode. Router> Router(config)# interface ATM0/IMA0 VPI/VCI l2transport Specifies the slot location and port of IMA interface group. slot Specifies the slot location of the ATM IMA port adapter. group-number Specifies the group number of the IMA group. Specifies the VPI and VCI and configures them in layer 2 transport mode. Router(config-if)# 100/12 l2transport 8

9 Verifying IMA Configurations Step 6 encapsulation encapsulation-type Router(config-if-atm-l2trans-)# encapsulation aal5 xconnect ip-address port-number encapsulation mpls Sets the encapsulation type to AAL5. AAL5 is the default l2transport encapsulation for the VCC mode. Binds an attachment circuit to the ATM IMA interface to create a pseudowire. Router(config-if-atm-l2trans-)# xconnect encapsulation mpls Verifying IMA Configurations To verify the IMA configurations, use the show ima interface command. Router# show ima interface ATM0/IMA3 ATM0/IMA3 is up, ACTIVATION COMPLETE Slot 0 Slot Unit 0 unit 3, CTRL VC -1, Vir -1, VC -1 IMA Configured BW 3022, Active BW 3022 IMA version 1.0, Frame length 64 Link Test: Disabled Auto-Restart: Disabled ImaGroupState: NearEnd = operational, FarEnd = operational ImaGroupFailureStatus = nofailure IMA Group Current Configuration: ImaGroupMinNumTxLinks = 1 ImaGroupMinNumRxLinks = 1 ImaGroupDiffDelayMax = 200 ImaGroupNeTxClkMode = independent(itc) ImaGroupFrameLength = 64 ImaTestProcStatus = disabled ImaGroupTestLink = None ImaGroupTestPattern = 0xFF ImaGroupConfLink = 2 ImaGroupActiveLink = 2 IMA Link Information: ID Link Link State - Ctlr/Chan/Prot Test Status Scrambling T1 0/0 Up Up Up Up disabled Off 1 T1 0/1 Up Up Up Up disabled Off How to Configure ATM Class of Service This section describes how to configure ATM class of services: Configuring Constant Bit Rate Complete the following steps to configure Constant Bit Rate (CBR) QoS class for an ATM PVC and to specify the bandwidth on the Cisco ASR 901 series router. 9

10 Configuring Unspecified Bit Rate Enables privileged EXEC mode. Router> Configures an ATM interface and enters the interface configuration mode. Router(config)# interface ATM1/IMA0 pvc VPI/VCI l2transport Router(config-if)# 100/12 l2transport cbr rate Router(config-if-atm-vc)# cbr Specifies the VPI and VCI of the PVC and configures the PVC in Layer 2 transport mode. l2transport is an optional keyword. Configures the constant bit rate (CBR) QoS class for an ATM permanent virtual circuit () and specifies the bandwidth. rate Peak cell rate in Kbps. Configuring Unspecified Bit Rate Complete the following steps to configure Unspecified Bit Rate (UBR) QoS class for an ATM permanent virtual circuit () and to specify the bandwidth on the Cisco ASR 901 series Router. Enables the privileged EXEC mode. Router> 10

11 Configuring Unspecified Bit Rate Plus Configures an ATM interface and enters the interface configuration mode. Router(config)# interface ATM1/IMA0 pvc VPI/VCI l2transport Router(config-if)# pvc 100/12 l2transport Specifies the VPI and VCI of the PVC and configures the PVC in layer 2 transport mode. l2transport is an optional field. ubr rate Router(config-if-atm-vc)# ubr Configures the UBR QoS class for an ATM permanent virtual circuit (PVC) and specifies the bandwidth. By default a value is set to UBR ATM class of service with the rate equal to the bandwidth of the IMA interface, which in turn is a product of the number of active IMA links and the bandwidth of each link. rate Peak cell rate in Kbps. Configuring Unspecified Bit Rate Plus Complete the following steps to configure Unspecified Bit Rate Plus (UBR+) QoS class for an ATM permanent virtual circuit () and to specify the bandwidth on the Cisco ASR 901 series Router. Enables the privileged EXEC mode. Router> Configures an ATM interface and enters the interface configuration mode. Router(config)# interface ATM1/IMA0 pvc VPI/VCI l2transport Router(config-if)# pvc 100/12 l2transport Specifies the VPI and VCI of the PVC and configures the PVC in layer 2 transport mode. l2transport is an optional field. 11

12 Configuring Variable Bit Rate for Real/Non-Real Time Traffic ubr+ pcr-rate mcr-rate Router(config-if-atm-vc)# ubr Configures the UBR+ QoS class for an ATM permanent virtual circuit () and specifies the bandwidth. pcr-rate Peak cell rate in Kbps. mcr-rate Peak cell rate in Mbps Configuring Variable Bit Rate for Real/Non-Real Time Traffic Complete the following steps to configure the real/non-real time Variable Bit Rate for VoATM voice connections for an ATM on the Cisco ASR901 series Router. Enables the privileged EXEC mode. Router> Configures an ATM interface and enters the interface configuration mode. Router(config)# interface ATM1/IMA0 pvc VPI/VCI l2transport Router(config-if)# pvc 100/12 l2transport Do one of the following: vbr-rt peak-rate average-rate burst vbr-nrt peak-rate average-rate burst Router(config-if-atm-vc)# vbr-rt Specifies the VPI and VCI of the PVC and configures the PVC in layer 2 transport mode. l2transport is an optional field. Configures the real-time VBR for VoATM voice connections for an ATM in virtual circuit configuration mode. Configures the non-real time VBR for VoATM voice connections for an ATM in virtual circuit configuration mode. peak-rate Peak cell rate in Kbps. average-rate Average cell rate in Kbps. burst Burst cell size in number of cells. Minimum cell size is

13 Configuration Examples Router(config-if-atm-vc)# vbr-nrt Configuration Examples This section provides sample configuration examples for IMA on the Cisco ASR 901 Router: Creating an IMA Interface The following is a sample configuration to create an IMA interface with T1 controller. controller t1 0/0 ima-group 0 exit The following is a sample configuration to create an IMA interface with E1 controller. controller e1 0/0 ima-group 0 exit Configuring a Port Mode Pseudowire The following is a sample configuration of a port mode pseudowire. interface ATM0/IMA2 no ip address xconnect encapsulation mpls Configuring an N-to-1 VCC Cell Mode The following is a sample configuration of N-to-1 VCC cell mode: interface ATM0/IMA0 no ip address atm mcpt-timers no atm -ilmi-trap 100/100 l2transport cell-packing 10 mcpt-timer 2 encapsulation aal0 xconnect encapsulation mpls The following is a sample configuration for AAL5 SDU mode: 13

14 Configuring an N-to-1 VPC Cell Mode interface ATM0/IMA0 no ip address no atm -ilmi-trap 100/100 l2transport encapsulation aal5 xconnect encapsulation mpls Configuring an N-to-1 VPC Cell Mode Configuring CBR The following is a sample configuration of N-to-1 Permanent Virtual Circuit (VPC) cell mode. interface ATM0/IMA0 no ip address atm pvp 12 l2transport xconnect encapsulation mpls The following is a sample configuration of constant bit rate. interface atm0/ima0 1/200 l2transport cbr Configuring UBR The following is a sample configuration of constant bit rate. interface atm0/ima0 1/200 l2transport ubr Configuring UBR Plus interface atm0/ima0 1/200 l2transport ubr Configuring VBR for Real Time Traffic interface atm0/ima0 1/200 l2transport vbr-rt

15 Configuring VBR for Non-Real Time Traffic Configuring VBR for Non-Real Time Traffic interface atm0/ima0 1/200 l2transport vbr-nrt Configuring Marking MPLS Experimental Bits You can configure MPLS through the following procedures: Creating a Policy-map for PVP/PVC/ATM IMA Interface To configure a policy map, complete the following steps: Enables the privileged EXEC mode. Router> policy-map policy-map-name Specifies a name for the policy map. Router(config)# policy-map mark_qosgroup class class-name Specifies a name for the class associated with the policy map. Router(config-if)# class class-default set qos-group qos-group-number Sets a group to the policy map. Router(config-if)# set qos-group 2 15

16 Applying the Policy-map Applying the Policy-map You can apply a policy map on the following interfaces: Applying a Policy map on PVC and PVP To apply a policy map on PVC and PVP, complete the following steps: Enables privileged EXEC mode. Router> Router(config)# interface atm0/ima0 no ip address Specifies the slot location and port of IMA interface group and configures the ATM interface. slot Specifies the slot location of the ATM IMA port adapter. group-number Specifies the group number of the IMA group. Disables the IP address configuration for the physical layer interface. Router(config-if)# no ip address no atm -ilmi-trap Disables the ILMI trap parameters. Step 6 Router(config-if)# no atm -ilmi-trap pvc VPI/VCI l2transport Specifies the VPI and VCI of the PVC and configures the PVC in layer 2 transport mode. Step 7 Router(config-if)# pvc 100/100 l2transport encapsulation encapsulation-type Sets the PVC encapsulation type to AAL0. 16

17 Applying a Policy map on ATM IMA Interface Step 8 Router(config-if)# encapsulation aal0 service-policy input policy-map-name Attaches a policy map to the input interface. Step 9 Router(config-if)# service-policy input mark_qosgroup xconnect ip-address port-number encapsulation mpls Binds an attachment circuit to the ATM IMA PVC to create a pseudowire. 0 Router(config-if)# xconnect encapsulation mpls atm pvp VPI l2transport Specifies the VPI of the PVP and configures the PVP in layer 2 transport mode. 1 Router(config-if)# atm pvp 200 l2transport service-policy input policy-map-name Attaches a policy map to the input interface. 2 Router(config-if)# service-policy input mark_qosgroup xconnect ip-address port-number encapsulation mpls Binds an attachment circuit to the ATM IMA PVP to create a pseudowire. Router(config-if)# xconnect encapsulation mpls Applying a Policy map on ATM IMA Interface To apply a policy map on ATM IMA interface, complete the following steps: Enables privileged EXEC mode. Router> 17

18 Creating a Table-map Router(config)# interface atm0/ima0 no ip address Specifies the slot location and port of IMA interface group and configures the ATM interface. slot Specifies the slot location of the ATM IMA port adapter. group-number Specifies the group number of the IMA group. Disables the IP address configuration for the physical layer interface. Router(config-if)# no ip address no atm -ilmi-trap Disables the ILMI trap parameters. Step 6 Router(config-if)# no atm -ilmi-trap service-policy input policy-map-name Attaches a policy map to the input interface. Step 7 Router(config-if)# service-policy input mark_qosgroup xconnect ip-address port-number encapsulation mpls Binds an attachment circuit to the ATM IMA interface to create a pseudowire. Router(config-if)# xconnect encapsulation mpls Creating a Table-map To create a table map for mapping QoS group to MPLS experimental bit, complete the following steps: Enables the privileged EXEC mode. 18

19 Creating a Policy-map for SVI Interface Router> table-map table-name Creates a table map with the specified name. Router(config)# table-map qos_exp_table map from from-value to to-value Maps the values associated with the policy map. Router(config-if)# map from 1 to 2 Creating a Policy-map for SVI Interface To create a policy-map, complete the following steps: Enables the privileged EXEC mode. Router> policy-map map-name Specifies the name of the existing policy map. Router(config)# policy-map pmap_qos_exp class class-default Specifies the name of the class associated with the policy map. Router(config)# class class-default 19

20 Applying a Service Policy on SVI Interface set mpls experimental topmost qos-group table table-map-name Copies the MPLS EXP value in the incoming MPLS traffic to the Qos group table. Router(config-if)# set mpls experimental topmost qos-group table qos_exp_table Applying a Service Policy on SVI Interface To apply a service policy on SVI interface, complete the following steps: Enables privileged EXEC mode. Router> interface interface-type Specifies the interface type and enters the interface configuration mode. Router(config)# interface vlan10 mtu bytes Router(config-if)# mtu 9216 ip address ip-address subnet-mask Configures the IP maximum transmission unit (MTU) size for the tunnel. bytes The range is from 1500 to The default is Configures an IP address and subnet mask on the interface. Step 6 Router(config-if)# ip address mpls ip Enables MPLS forwarding of IPv4 packets along normally routed paths for the interface. Router(config-if)# mpls ip 20

21 Additional References Step 7 service-policy output policy-map-name Attaches the specified policy map to the output interface. Router(config-if)# service-policy output pmap_qos_exp Additional References The following sections provide references related to inverse multiplexing over ATM. Related Documents Related Topic Cisco IOS Commands Cisco ASR 901 Command Reference Cisco IOS Interface and Hardware Component Commands Document Title Cisco IOS Master Commands List, All Releases Cisco ASR 901 Series Aggregation Services Router Command Reference Cisco IOS Interface and Hardware Component Command Reference Standards Standard None Title MIBs MIB IMA-MIB MIBs Link To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: RFCs RFC None Title 21

22 Feature Information for Inverse Multiplexing over ATM Technical Assistance Description The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content. Link Feature Information for Inverse Multiplexing over ATM Table 1: Feature Information for Inverse Multiplexing over ATM, on page 22 lists the features in this module and provides links to specific configuration information. Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator s you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to An account on Cisco.com is not required. Note Table 1: Feature Information for Inverse Multiplexing over ATM, on page 22 lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. Table 1: Feature Information for Inverse Multiplexing over ATM Feature Name Inverse Multiplexing over ATM Releases 15.2(2)SNH1 Feature Information This feature was introduced. See the following links for more information about this feature: How to Configure IMA, on page 2 Configuring ATM IMA on T1/E1 Interface, on page 2 Configuring ATM IMA over MPLS, on page 3 How to Configure ATM Class of Service, on page 9 Configuring Marking MPLS Experimental Bits, on page 15 22