[c-nsp] IOS-XR: 6PE - next-hop manipulation in route-policy.

[Pshem Kowalczyk]

Hi,

For IPv4 we ended up manipulating the next hops on the outbound policy
from the RRs (in XR). There is one magic switch under the bgp config
that you have to enable for the outbound manipulations to work:
bgp xxxx
 ibgp policy out enforce-modifications

kind regards
Pshem


On 4 February 2014 04:17, Jonathan Hart <johathan.hart at gmail.com> wrote:
> Hi list,
>
>
>
> I am trying to manipulate the next-hop for community-tagged routes, inbound
> on a 6PE router. Routes are received from route-reflectors, and should be
> treated inbound. In this specific scenario I am trying to change a
> next-hop. The configuration is based on what we have in production on IOS
> today, where this works just fine.
>
>
>
> PE is ASR9000 running IOS-XR 4.3.2.
>
>
>
> My configuration;
>
> Non-essential configuration has been omitted.
>
>
>
> router static
>
>  address-family ipv6 unicast
>
>   2001:db8::160/128 Null0
>
>   ::ffff:192.168.0.1/128 Null0
>
>
>
> router bgp <asn>
>
>  neighbor-group IPv6RR
>
>    address-family ipv6 labeled-unicast
>
>    route-policy rr-edge-in in
>
>
>
>
>
> route-policy rr-edge-in
>
>   if community matches-any (1000:6) and destination in (::/0 ge 64) then
>
>     set next-hop 2001:db8::160
>
>   endif
>
>     pass
>
> end-policy
>
>
>
> Also tried this..
>
>
> route-policy rr-edge-in
>
>   if community matches-any (1000:6) and destination in (::/0 ge 64) then
>
>     set next-hop ::ffff:192.168.0.1
>
>   endif
>
>     pass
>
> end-policy
>
>
>
> The defined policy is processing the routes. I tried swapping the
> "next-hop" statement for a simple "drop", and the prefix was dropped. In
> IOS, I use an IPv6 next-hop which works just fine. In IOS-XR, I tried with
> both a normal IPv6 unicast address, and with IPv4-mapped address - without
> success.
>
>
>
> I am sure there is a reasonable explanation for this, and I have a feeling
> it lies in the 6PE part of the next-hop magic. As it seems to be working
> just fine in IOS, I'm fairly confident it should be possible to do in XR as
> well.
>
>
>
> Any help is appreciated!
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