CONFIGURING ETHERNET LINK BUNDLES IN CISCO IOS XR (ASR 9000)

Link bundling is an IOS XR term of Etherchannel .The Link Bundling feature in Cisco IOS XR (ASR 9000 family works on IOS XR) allows you to group multiple point-to-point links together into one logical link hence providing higher throughput, redundancy and load balancing between two routers. In other words, a link bundle is a group of one or more ports that are aggregated together and treated as a single link. Each bundle has a single MAC, a single IP address, and a single configuration set

Cisco ASR 9000 Series Router supports both Layer 2 and Layer 3 Link Bundles.

If the Link Bundle is –

  • Layer 3 interface – an IP address is required
  • Layer 2 interface – an IP address is not required.

A Link Bundle on the Cisco ASR 9000 Series Router may contain Layer 2 and Layer 3 subinterfaces within it. In which case,

In case of subinterfaces –

  • Layer 3 subinterfaces – requires IP address
  • Link Bundle interface – does not require an IP address.

Below is a simple diagram depicting Link Bundle created between 2 Cisco ASR 9000 Routers running IOS XR –

 

CONFIGURATION –

The step by step configuration on each router for bringing up Link Bundle (in IOS XR) is as below –

RP/0/RSP0/CPU0:router# configureRP/0/RSP0/CPU0:router#(config)# interface Bundle-Ether 2

RP/0/RSP0/CPU0:router(config-if)# ipv4 address 192.168.1.1 255.255.255.0

RP/0/RP0/CPU0:router(config-if)# bundle minimum-active links 2 >>>>>> minimal of 2 links should be up before the bundle link can be brought up

RP/0/RSP0/CPU0:router(config)# interface TenGigE 0/0/0/1

RP/0/RSP0/CPU0:router(config-if)# bundle-id 2 mode active >>>>>> will enable active LACP in bundle

RP/0/RSP0/CPU0:router(config-if)# no shutdown

RP/0/RSP0/CPU0:router(config-if)# exit

RP/0/RSP0/CPU0:router(config)# interface TenGigE 0/0/0/2

RP/0/RSP0/CPU0:router(config-if)# bundle id 2 mode active >>>>>> will enable active LACP in bundle

RP/0/RSP0/CPU0:router(config-if)# no shutdown

RP/0/RSP0/CPU0:router(config-if)# exit

RP/0/RSP0/CPU0:router(config)# interface TenGigE 0/0/0/3

RP/0/RSP0/CPU0:router(config-if)# bundle id 2 mode active >>>>>> will enable active LACP in bundle

RP/0/RSP0/CPU0:router(config-if)# no shutdown

RP/0/RSP0/CPU0:router(config-if)# exit

RP/0/RSP0/CPU0:router(config)# interface TenGigE 0/0/0/4

RP/0/RSP0/CPU0:router(config-if)# bundle id 2 mode active >>>>>> will enable active LACP in bundle

RP/0/RSP0/CPU0:router(config-if)# no shutdown

RP/0/RSP0/CPU0:router(config-if)# exit

RP/0/RSP0/CPU0:router(config-if)# end      

VERIFICATION –

Once the configuration is performed , below command will help verify the Bundle members and related protocols and mechanisms in use like “LACP/PAGP/On” , “minimal active links” etc

RP/0/RSP0/CPU0:router# show bundle Bundle-Ether 2Bundle-Ether2

Status:                                                                                               Up

Local links <active/standby/configured>:                               4 / 0 / 4

Local bandwidth <effective/available>:                                  80000000 (80000000) kbps

MAC address (source):                                                               0001.0002.0003 (Chassis pool)

Inter-chassis link:                                                                        No

Minimum active links / bandwidth:                                         2 / 1 kbps

Maximum active links:                                                               64

Wait while timer:                                                                         2000 ms

Load balancing:                                                                            Default

LACP:                                                                                             Operational

Flap suppression timer:                                                              Off

Cisco extensions:                                                                         Disabled

mLACP:                                                                                         Not configured

IPv4 BFD:                                                                                      Not configured

Port                     Device                 State                 Port ID                             B/W,      kbps

——————– —————        ———–              ————–                         ———-

Te0/0/0/1           Local                   Active                   0x8000, 0x0002            1000000

Link is Active

Te0/0/0/2           Local                   Active                   0x8000, 0x001a             1000000

Link is Active

Te0/0/0/3           Local                   Active                   0x8000, 0x0009             1000000

Link is Active

Te0/0/0/4           Local                   Active                   0x8000, 0x0001             1000000

Link is Active   

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