Mailing List Archive

On 8/30/23 18:14, Mark Tinka via cisco-nsp wrote:

> Hi all.
>
> Does anyone have any definitive info per subject?
>
> We don't see support in our CSR1000v units, and my SE seems to have
> gone fishing.
>
> Anyone who has deployed Cat8000v know if there is support there? It's
> what we are moving to, but we aren't there yet.
>
> Using different RD's per site is a workaround, but...

Actually, different RD's are not a solution for VRF routes leaked into
the global table. It will only work for traffic carried inside the VRF
domain.

If IOS XE can't support Add-Paths for VPN traffic, direct iBGP sessions
may be necessary to workaround this. Ouch!

Mark.
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On 8/30/23 18:24, Mark Tinka wrote:

>
> Actually, different RD's are not a solution for VRF routes leaked into
> the global table. It will only work for traffic carried inside the VRF
> domain.
>
> If IOS XE can't support Add-Paths for VPN traffic, direct iBGP
> sessions may be necessary to workaround this. Ouch!

So this turned out to be a known limitation as described in CSCvn41817.

Basically, IOS XE is unable to advertise capability for Add-Paths for
VPNv4 and VPNv6 AFI's.

From IOS XE 17.9.x and later, VPNv4 and VPNv6 supports the "bgp
additional-paths select" and "bgp additional-paths install" features.

However, neither "bgp additional-paths send receive" nor "advertise
additional-paths" are supported, making it a fractured and not very
useful feature.

Mark.
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