PE-to-CE eBGP using BVI - no data forwarding

[ar]

Hi Cisco Experts.

Is there a limitation in using IRB and BVI in PE-to-CE eBGP peering?

Interface facing CE is configured as:

- L2transport

- dot1q encapsulation

- VRF

- IPv4 address in BVI

- l2vpn configuration for PE to CE interface and BVI

- eBGP with CE

My experience is PE receives/advertises all routes. But user plane is not working. No data is being forwarded.

XR version is  5.2.0

Please advise. thanks.

[Swapnil Shingvi]

Hi Ar,

make sure you have "per-VRF label allocation" enabled under the vrf under bgp since its the only supported config.

Thanks

Swapnil

[ar]

Hi Swapnil.

Thanks.

Do you have good documentation for this?

Is this a known issue in IRB PE-to-CE and will be resolved 100% with this command?

ARe routes coming from PE-to-CE using physical interface will now be also per-vrf label allocation? or will not be affected and will still be per-prefix?

[Eddie Chami]

Hi, this is per design. Well documented here:

http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r4-1/interfaces/configuration/guide/hc41asr9kbook/hc41irb.html#wp1014268

Regards

Eddie.

[ar]

Thanks.

Is this required to be configured on all PEs?

Or it's safe to just apply on involved PE?

[Swapnil Shingvi]

Hi Ar,

yes on all PEs ,read more below

https://supportforums.cisco.com/discussion/11332686/forwarding-does-not-work-if-label-allocation-mode-vrf-not-set-using-bvi

hth,

swapnil

[ar]

Hi Swapnil.

Can I touch just the PE router having BVI vrf aware facing CE?

Or is it design wise recommended to configure on all PEs?

I am also thinking of placing a route-policy such as below to affect only routes coming from particulary CE.

router bgp <>

vrf TEST

address-family ipv4

label mode route-policy VRF-TEST per-vrf