Monday, October 15, 2018

XR L2transport question?

Hi Guys,

I have this scenario wherein I have 2 routers need to communicate and its passing thru l2vpn that is configured on XR. Now I would like to confirm the below setup and ask whether we can impose/tag a vlan on XR main-interface in ethernet portmode l2transport.

Scenario:

RTR1 ----XR9k1--l2vpn---XR9k2-----RTR2

RTR1 is directly connect to XR9k1 and l2vpn established towards to XR9k2 to RTR2.

Configuration:

RTR01:

int g0/0

ip address 1.1.1.1/30

XR9k1

interface GigE0/0

l2transport (is this allow all vlan?)

XR9k2

GigE0/1.100

encapsulation dot1q 100

rewrite ingress tag pop 1 symmetric

RTR02 (under sub-int)

int g0/0.100

encapsulation dot1q 100

ip address 1.1.1.1/30

Now my question is this a correct setup?

  1. Since RTR1 sending without any tag, when it reaches XR9k02, XR9k02 will tagged it as 100 and forward to RTR02.
  2. RTR02 will match the incoming traffic with tagged of 100, while the reply of RTR02 will have a tag.
  3. Reply from RTR02 will now pass to XR02 which then be process by match the encap, adding additional header for MPLS, Since i dont have "rewrite ingress tag pop 1 symmetric" on XR9k01 do you think it can reach RTR01 succesfully?

Thanks



No comments:

Post a Comment