OTV - ASR1001-X - Two physical interfaces?

[roger perkin]

I am looking for a configuration guide for OTV using the ASR platform where the ASR is not the main routing platform. 

I would like to deploy OTV between two sites which already have L3 connectivity. 

The ASRs have been purchased to provide L2 between two sites. 

One requirement I have seen with the ASRs is they have to have 2 physical interfaces.

Question: 

How do I use the ASR's for OTV with regards to traffic flow?

I was thinking I could use them like router on a stick as in the N7K deployment, but all the topologies I have seen so far have the routers in the traffic path - I cannot break the traffic path to put the routers in so can I configure them on a stick?

Thanks

Roger

[Steve Fuller · Accepted solution]

Hi Roger,

I've done something along the lines of the attached, albeit with Nexus 7000 rather than ASR, but the principle should be the same.

The configuration (taken from a CSR) would be as follows:

!
interface GigabitEthernet1
 description Join interface towards L3 core
 mtu 1600
 ip address A.B.C.D 255.255.255.252
 load-interval 30
 negotiation auto
!
bridge-domain 51
bridge-domain 52
!
interface GigabitEthernet2
 description Internal interface
 no ip address
 negotiation auto
 service instance 51 ethernet
  encapsulation dot1q 51
  bridge-domain 51
 !
 service instance 52 ethernet
  encapsulation dot1q 52
  bridge-domain 52
 !
!
interface Overlay1
 no ip address
 load-interval 30
 otv join-interface GigabitEthernet1
 otv use-adjacency-server 192.168.11.241 unicast-only
 otv adjacency-server unicast-only
 service instance 51 ethernet
  encapsulation dot1q 51
  bridge-domain 51
 !
 service instance 52 ethernet
  encapsulation dot1q 52
  bridge-domain 52
 !
!

There will obviously be a little more configuration (otv site bridge-domain and otv site-identifier) if using a pair of ASR per site for resilience.

You should be able to develop a working setup entirely with CSR 1000V to at least get some hands on. And from what I see you've dabbled with the CSR a little bit :-)

Not on a stick exactly, but you don't have to alter the existing traffic path.

Regards

[roger perkin]

Thanks Steve, 

I will be joining connecting the ASRs to a 6880 core so will have to have one L2 interface and one L3 interface. 

The configs are helpful and yes I will be labbing this on the CSRs first. 

Once I have it up and running I will post more details