Table Of Contents
Access Circuit Redundancy Support for Inverse Multiplexing over ATM
Prerequisites for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
Restrictions for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
Information About Access Circuit Redundancy Support for Inverse Multiplexing over ATM
How to Configure Access Circuit Redundancy Support for Inverse Multiplexing over ATM
Configuring IMA Groups on a Virtual Controller
Configuring an ATM PVC on an IMA ACR Interface or an ATM ACR Group
Configuring an ATM PVP on an IMA ACR Interface or an ATM ACR Group
Configuration Examples for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
Example: Configuring ACR and IMA Groups
Example: Configuring an IMA ACR Interface on an ATM PVP
Example: ACR show Command Output
Feature Information for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
Access Circuit Redundancy Support for Inverse Multiplexing over ATM
First Published: November 24, 2010Last Updated: November 24, 2010The Access Circuit Redundancy Support for Inverse Multiplexing over ATM feature provides a converged IP or Multiprotocol Label Switching (MPLS) access network for its mobile users that use Radio Access Network (RAN) aggregation.
Inverse Multiplexing over ATM (IMA) breaks up the ATM cell stream and distributes the cells over the multiple physical links of an IMA group and then recombines the cells into a single stream at the other end of the connection. In IP RAN 3G networks, ATM cells received on the access side are transported using Layer 2 Transport over an IP or MPLS cloud using MPLS pseudowires (PWs). SONET-APS is used to provide redundancy at the access side that connects the Base Transceiver Station (BTS) and the Circuit Emulation over Packet (CEoP) card in the aggregation router. The convergence time upon failure in this framework is in seconds. ACR provides ACR for SONET-based clients in a Single Router Automatic Protect Switching (SR APS) environment that ensures data traffic downtime of less than 500 milliseconds in case of switchover.
Finding Feature Information
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 Access Circuit Redundancy Support for Inverse Multiplexing over ATM" section.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
•Prerequisites for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
•Restrictions for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
•Information About Access Circuit Redundancy Support for Inverse Multiplexing over ATM
•How to Configure Access Circuit Redundancy Support for Inverse Multiplexing over ATM
•Configuration Examples for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
•Feature Information for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
Prerequisites for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
The Access Circuit Redundancy Support for Inverse Multiplexing over ATM feature is supported only on Cisco 7600 routers with Session Initiation Protocol (SIP) 400 line cards and Black Russian (BR) Shared Point Adapters (SPA) (SPA-1CHOC3-CE-ATM).
Restrictions for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
•ACR configuration is an extension of APS and works only with an APS configuration.
•ACR support is available only for SR APS.
•There is no provision for migration from the existing physical interface-based configuration, because the entire configuration is on a virtual interface.
•The maximum number of ACR groups is restricted to the maximum number of SONET controllers or BR SPAs supported on a Cisco 7600 router.
•There are only 11 slots of SIP 400 (2 for rendezvous point (RP)) available.
•The absence of dedicated primary and secondary line cards results in port-level redundancy. Each port has to be identified as a primary or secondary.
•ACR can be configured only after all the previous configurations are removed from the physical interface.
•Once a member controller of an ACR group is removed during the online insertion and removal (OIR) process, and replaced with another controller, it cannot be reinserted into the ACR group.
Information About Access Circuit Redundancy Support for Inverse Multiplexing over ATM
The aggregation of multiple low-speed links (T1/E1) into one or more IMA groups provides IMA support. The ATM IMA interface appears as one logical ATM interface.
How to Configure Access Circuit Redundancy Support for Inverse Multiplexing over ATM
•Configuring ACR (required)
•Configuring IMA Groups on a Virtual Controller (required)
•Configuring an ATM PVC on an IMA ACR Interface or an ATM ACR Group (required)
•Configuring an ATM PVP on an IMA ACR Interface or an ATM ACR Group (required)
Configuring ACR
Support for ACR has been provided using the aps command on the SONET controller. Perform the following steps to configure ACR:
SUMMARY STEPS
1. enable
2. configure terminal
3. controller SONET slot/p-adapter/port
4. aps group acr acr-group-number
5. aps working channel
6. exit
7. controller SONET slot/p-adapter/port
8. aps group acr acr-group-number
9. aps protect circuit-number loopback ip-address
10. end
DETAILED STEPS
Configuring IMA Groups on a Virtual Controller
To configure the IMA group on a virtual controller, use the following commands:
SUMMARY STEPS
1. enable
2. configure terminal
3. controller SONET-ACR slot/p-adapter/port
4. framing sonet
5. sts-1 id-number
6. mode mode-name
7. vtg number interface interface-number ima-group group-number
8. exit
9. exit
10. interface IMA-ACR group-number/ima ima-group-id
11. pvc vpi/vci l2transport
12. xconnect peer-id vc-id encapsulation mpls
13. end
DETAILED STEPS
Configuring an ATM PVC on an IMA ACR Interface or an ATM ACR Group
To create a virtual ATM ACR group or an IMA ACR interface and configure an ATM PVC, use the following commands:
SUMMARY STEPS
1. enable
2. configure terminal
3. interface IMA-ACR group-number/ima ima-group-id
4. pvc vpi/vci l2transport
5. xconnect peer-id vc-id encapsulation mpls
6. end
DETAILED STEPS
Configuring an ATM PVP on an IMA ACR Interface or an ATM ACR Group
To create a virtual ATM ACR group or an IMA ACR interface and configure an ATM PVP, use the following commands:
SUMMARY STEPS
1. enable
2. configure terminal
3. interface IMA_ACR group-number/ima ima-group-id
4. atm pvp vpi l2transport
5. xconnect peer-id vc-id encapsulation mpls
6. end
DETAILED STEPS
Configuration Examples for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
•Example: Configuring ACR and IMA Groups
•Example: Configuring an IMA ACR Interface on an ATM PVP
•Example: ACR show Command Output
Example: Configuring ACR and IMA Groups
The following example shows how ACR and IMA groups are configured:
Working ACR Member
controller SONET 4/1/0framing sonetclock source line!sts-1 1mode vt-15!sts-1 2mode vt-15!sts-1 3mode vt-15aps group acr 1aps working 1Protect ACR Member
controller SONET 4/3/0framing sonetclock source line!sts-1 1mode vt-15!sts-1 2mode vt-15!sts-1 3mode vt-15aps group acr 1aps protect 1 10.2.2.2controller SONET-ACR 1framing sonet!sts-1 1mode vt-15!sts-1 2mode vt-15!sts-1 3mode vt-15vtg 1 t1 1 ima-group 0interface IMA-ACR 1/ima 0no ip addresspvc 2/34 l2transportxconnect 10.3.3.3 1234 encapsulation mpls!endExample: Configuring an IMA ACR Interface on an ATM PVP
The following example shows how an IMA ACR interface on ATM PVP is configured:
interface ATM 1/0/0aps group acr 1aps working 1!interface ATM 1/0/1aps group acr 1aps protect 1 10.2.2.2!interface Loopback 1ip address 10.1.1.1 255.255.255.0interface ATM-ACR 1no ip addressatm pvp 10 l2transportxconnect 10.2.2.2 1234 encapsulation mplsExample: ACR show Command Output
The show acr group command lists the status of all active ACR groups:
Router# show acr groupACR Group Working I/f Protect I/f Currently Active Status--------------------------------------------------------------------------1 SONET 4/1/0 SONET 4/3/0 SONET 4/1/0The show acr group acr-group-number command lists the status of a specific ACR group:Router# show acr group 1ACR Group Working I/f Protect I/f Currently Active Status--------------------------------------------------------------------------1 SONET 4/1/0 SONET 4/3/0 SONET 4/1/0The show acr group acr-group-number detail command lists the status and details of a specific ACR group:
Router# show acr group 1 detail imaACR Group Working I/f Protect I/f Currently Active Status--------------------------------------------------------------------------IM1/ima0 ATM4/1/ima0 ATM4/3/ima0 ATM4/1/ima0ATM PVC DetailVPI VCI State on Working State on Protect2 34 Provision Success UnknownRouter#The show controllers SONET-ACR slot/p-adapter/port command lists the details of the active controllers:Router# show controllers sonet 4/1/0SONET 4/1/0 is up.Hardware is SPA-1CHOC3-CE-ATMApplique type is Channelized Sonet/SDHClock Source is LineMedium info:Type: Sonet, Line Coding: NRZ,SECTION:LOS = 0 LOF = 0 BIP(B1) = 13SONET/SDH Section TablesINTERVAL CV ES SES SEFS06:13-06:28 0 0 0 005:58-06:13 0 0 0 005:43-05:58 0 0 0 0...23:43-23:58 0 0 0 023:28-23:43 0 0 0 006:13-06:28 0 0 0 0Total of Data in Current and Previous Intervals06:13-06:28 0 0 0 0LINE:AIS = 0 RDI = 0 REI = 351390 BIP(B2) = 23Active Defects: NoneActive Alarms: NoneAlarm reporting enabled for: SLOS SLOFDefect reporting enabled for: SF B1-TCA B2-TCABER thresholds: SF = 10e-3 SD = 10e-6TCA thresholds: B1 = 10e-6 B2 = 10e-6SONET/SDH Line TablesINTERVAL CV ES SES UAS06:13-06:28 0 0 0 005:58-06:13 0 0 0 005:43-05:58 0 0 0 0...Total of Data in Current and Previous Intervals06:13-06:28 0 0 0 0High Order Path:PATH 1:AIS = 0 RDI = 1 REI = 2302655982 BIP(B3) = 3659922183LOP = 0 PSE = 32 NSE = 0 NEWPTR = 0LOM = 0 PLM = 0 UNEQ = 0Active Alarms: NoneActive Defects: PRDI B3-TCAAlarm/Defect reporting enabled for: PLOP LOM B3-TCATCA threshold: B3 = 10e-6Rx: S1S0 = 02, C2 = 02K1 = 00, K2 = 00J0 = 01Tx: S1S0 = 00, C2 = 02K1 = 00, K2 = 00J0 = 01PATH TRACE BUFFER : STABLE45 32 20 32 2F 33 2F 30 2E 31 00 00 00 00 E6 50 E2 2/3/0.1.....P45 32 20 32 2F 33 2F 30 2E 31 00 00 00 00 E6 50 E2 2/3/0.1.....P45 32 20 32 2F 33 2F 30 2E 31 00 00 00 00 E6 50 E2 2/3/0.1.....P45 32 20 32 2F 33 2F 30 2E 31 00 00 00 00 E6 50 E2 2/3/0.1.....PSONET/SDH Path Tables.The show ima command lists the details of IMA activation on the active interfaces:
Router# show imaATM4/1/ima0 is up, ACTIVATION COMPLETESlot 4 Slot Unit 64 unit 256, CTRL VC 256, Vir -1, VC 4097IMA Configured BW 1523, Active BW 1523IMA version 1.1, Frame length 128Link Test: DisabledAuto-Restart: DisabledImaGroupState: NearEnd = operational, FarEnd = operationalImaGroupFailureStatus = noFailureIMA Group Current Configuration:ImaGroupMinNumTxLinks = 1 ImaGroupMinNumRxLinks = 1ImaGroupDiffDelayMax = 25 ImaGroupNeTxClkMode = common(ctc)ImaGroupFrameLength = 128 ImaTestProcStatus = disabledImaGroupTestLink = None ImaGroupTestPattern = 0x0ImaGroupConfLink = 1 ImaGroupActiveLink = 1IMA Link Information:ID Link Link State - Ctlr/Chan/Prot Test Status---- -------------- ------------------------------ ---------------0 VT1.5 3/1/1 Up Up Up Up disabledATM4/3/ima0 is up, ACTIVATION COMPLETESlot 4 Slot Unit 192 unit 256, CTRL VC 256, Vir -1, VC 4097IMA Configured BW 1523, Active BW 1523IMA version 1.1, Frame length 128Link Test: DisabledAuto-Restart: DisabledImaGroupState: NearEnd = startUp, FarEnd = groupStateUnknownImaGroupFailureStatus = startUpNeIMA Group Current Configuration:ImaGroupMinNumTxLinks = 1 ImaGroupMinNumRxLinks = 1ImaGroupDiffDelayMax = 25 ImaGroupNeTxClkMode = common(ctc)ImaGroupFrameLength = 128 ImaTestProcStatus = disabledImaGroupTestLink = None ImaGroupTestPattern = 0x0ImaGroupConfLink = 1 ImaGroupActiveLink = 0IMA Link Information:ID Link Link State - Ctlr/Chan/Prot Test Status---- -------------- ------------------------------ ---------------0 VT1.5 3/1/1 Up Up Up Up disabledIMA-ACR1/ima0 is up, CONFIG COMPLETESlot 14 Slot Unit 1 unit 256, CTRL VC 256, Vir -1, VC 4097IMA Configured BW 1523, Active BW 1523IMA version 1.1, Frame length 128Link Test: DisabledAuto-Restart: DisabledImaGroupState: NearEnd = operational, FarEnd = operationalImaGroupFailureStatus = noFailureIMA Group Current Configuration:ImaGroupMinNumTxLinks = 1 ImaGroupMinNumRxLinks = 1ImaGroupDiffDelayMax = 25 ImaGroupNeTxClkMode = common(ctc)ImaGroupFrameLength = 128 ImaTestProcStatus = disabledImaGroupTestLink = None ImaGroupTestPattern = 0x0ImaGroupConfLink = 1 ImaGroupActiveLink = 1IMA Link Information:ID Link Link State - Ctlr/Chan/Prot Test Status---- -------------- ------------------------------ ---------------0 VT1.5 3/1/1 Up Up Up Up disabledThe show ima interface interface-name IMA-ACR command lists the details of IMA-ACR activation on a specific interface:
Router# show ima interface IMA-ACR 1/ima 0IMA-ACR1/ima0 is up, CONFIG COMPLETESlot 14 Slot Unit 1 unit 256, CTRL VC 256, Vir -1, VC 4097IMA Configured BW 1523, Active BW 1523IMA version 1.1, Frame length 128Link Test: DisabledAuto-Restart: DisabledImaGroupState: NearEnd = operational, FarEnd = operationalImaGroupFailureStatus = noFailureIMA Group Current Configuration:ImaGroupMinNumTxLinks = 1 ImaGroupMinNumRxLinks = 1ImaGroupDiffDelayMax = 25 ImaGroupNeTxClkMode = common(ctc)ImaGroupFrameLength = 128 ImaTestProcStatus = disabledImaGroupTestLink = None ImaGroupTestPattern = 0x0ImaGroupConfLink = 1 ImaGroupActiveLink = 1IMA Link Information:ID Link Link State - Ctlr/Chan/Prot Test Status---- -------------- ------------------------------ ---------------0 VT1.5 3/1/1 Up Up Up Up disabledAdditional References
Related Documents
Standards
MIBs
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Feature Information for Access Circuit Redundancy Support for Inverse Multiplexing over ATM
Table 1 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 enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note Table 1 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.
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