[c-nsp] VPLS : Loop avoidance

[Nicolas KARP]

Hello,

We are going to interconnect two of our datacenters.  In one datacenter we
have a 6880-X configured with VSS and on the other hand, we have a pair of
ASR 1001-X.

 We would like to configure the VPLS and I have some questions about the
redundancy and loop avoidance. You can find a diagram attached to my email..


*6880 VSS : *

*l2 vfi VPLS-VLAN-582 manual*
* vpn id 582*
* neighbor ASR-2 24 encapsulation mpls*
* neighbor ASR-1 23 encapsulation mpls*

*interface Vlan582*
* mtu 9180*
* no ip address*
* xconnect vfi VPLS-VLAN-582*


*ASR 1: *

interface GigabitEthernet0/0/5
service instance 100 ethernet
  description VLAN582
  encapsulation dot1q 582 exact
  rewrite ingress tag pop 1 symmetric
  bridge-domain 582
 !

l2 vfi VPLS-VLAN-582 manual
 vpn id 582
 bridge-domain 582
 mtu 9180
 neighbor VSS-6880 23 encapsulation mpls
!


*ASR 2 : *

interface GigabitEthernet0/0/5
service instance 100 ethernet
  description VLAN582
  encapsulation dot1q 582 exact
  rewrite ingress tag pop 1 symmetric
  bridge-domain 582
 !
l2 vfi VPLS-VLAN-582 manual
 vpn id 582
 bridge-domain 582
 mtu 9180
 neighbor VSS-6880 24 encapsulation mpls
!


At the moment, I've enabled one interface on the ASR-1 (g0/0/5), the g0/0/5
on ASR-2 is still shut.  VPLS is working like a charm between the 6880 and
ASR-1 but now I would like to activate the second interface on ASR-2 :-)

I have some doubts about a loop in this case...
I guess there should be no loop because the 6880 is configured with
split-horizon but I just wanted to be sure that I will not break my network
if I activate the second port.

Can you please help me ?

Thank you.


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# - -   Nicolas KARP
# - -   Network and Security Engineer
# - -    Email : liste at karp.fr <nicolas at karp.fr>
# - -    Linkedin :  http://www.linkedin.com/in/nicolaskarp
# - -    Viadeo : http://www.viadeo.com/fr/profile/nicolas.karp
<http://www.viadeo.com/fr/profile/nicolas.karp%20>
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