ASR9K and 7609 l2 loop

mirkolobina · ‎08-10-2015

hi all, i am studying an integration in the following scenario:

7609_1 ----- 7609_2

| |

ASR9K ASR9K

\ /

ASR920

In the specific:

1) in the ASR920 i have configured a l2vpn vpls + bridge-domain (i have several devices attached to access switch ASR920):

l2vpn vfi context management100
vpn id 100
autodiscovery bgp signaling bgp
ve id 1
rd 1111:100
route-target export 1111:100
route-target import 1111:100
no auto-route-target

bridge-domain 100
member vfi management100

2) the ASR9K (i paste the config of one ASR, the other is the same):

l2vpn

bridge group management100
bridge-domain management100
   interface TenGigE0/0/0/16.100
    !
   vfi management100
    vpn-id 100
    autodiscovery bgp
     rd 1111:100
     route-target import 1111:100
     route-target export 1111:100
     signaling-protocol bgp
      ve-id 3

spanning-tree pvrst management100
vlan 100
!
interface TenGigE0/0/0/16

where TenGigE is the uplink to 7609_1 or _2. this interface is configured this way:

interface TenGigE0/0/0/16.100 l2transport
encapsulation dot1q 100
rewrite ingress tag pop 1 symmetric

3) the two 7609s are running rapid-pvrst in the cross between them and to the ASRs. the first 7609 is root bridge.

what is happening is a loop. i am a newbie of vpls in asr, so any idea/suggestions/clarifications welcome!!!

br and tnx advance, mirko

xthuijs · ‎08-10-2015

hi mirko,

you dont need to run stp in your vpls core between 7600 and a9k.

the stp runs from your edge devices a9k's to the switch 920.

vpls/pw's in teh core between your PE nodes.

if you want to run stp in the core, you can, not recommended, but then dont use PW's but use the EFP/sufinterfaces between a9k and 7600.

also have a look at this one:

https://supportforums.cisco.com/document/11935841/asr9000xr-using-pvstag-cluster-and-satellite-example

and this:

https://supportforums.cisco.com/document/61401/asr9000xr-using-mst-ag-mst-access-gateway-mst-and-vpls

that describe the Acess gateway functionality and the concepts of vpls/pw's and all that.

cheers!

xander

mirkolobina · ‎08-11-2015

tnx very much for your prompt reply: i am trying a config with psvrtag. i will post findings in the next hours. tnx again mirko

mirkolobina · ‎08-11-2015

all solved. i have used first approach from the first link.

tnx mirko

xthuijs · ‎08-11-2015

hey mirko, thanks for confirming! great to see the option worked!

cheers!

xander