export route-target

[Okejo]

Hi everyone,

On IOS-XR 24.2, I’d like to configure MP-BGP in such a way that routes redistributed into MP-BGP (static, direct, OSPF) are exported with different route-targets.

I have tried using an export policy, but the issue there is that I can't specify the protocol.
I also tried doing it under MP-BGP during redistribution into the VRF, but it doesn't allow me to configure extended community route-targets.

Could you help me figure out what the solution is?

[M02@rt37]

Hello @Okejo 

I also tried doing it under MP-BGP during redistribution into the VRF, but it doesn't allow me to configure extended community route-targets.

--Please share the config.

Thanks 

[Okejo]

I quickly made two examples

-first case:

vrf test-1
address-family ipv4 unicast
import route-target
10:100
!
route-policy export-test-1-static
if protocol is static then
set extcommunity rt 100:10
endif
set extcommunity rt 100:20
end-policy

router bgp 100
vrf test-1
rd 10:100
address-family ipv4 unicast
redistribute static

show configuration failed

vrf test-1
address-family ipv4 unicast
export route-policy export-test-1-static
!!% Could not find entry in list: Policy [export-test-1-static] uses the 'protocol' attribute. There is no 'protocol' attribute at the bgp export attach point.

-------second case:

vrf test-1
address-family ipv4 unicast
import route-target
10:100
!

route-policy test-1-static
set extcommunity rt 100:10
end-policy

router bgp 100
vrf test-1
rd 10:100
address-family ipv4 unicast
redistribute static route-policy test-1-static

show configuration failed

router bgp 100
vrf test-1
address-family ipv4 unicast
redistribute static route-policy test-1-static
!!% Could not find entry in list: Policy [test-1-static] uses 'assign rt'. 'set' is not a valid operator for the 'rt' attribute at the bgp redistribution-vrf attach point.

[tkarnani]

please check the operations table, set ext comm is not supported under import vrf only inbound neighbor

https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r6-1/routing/configuration/guide/b-routing-cg-asr9k-61x/b-routing-cg-asr9k-61x_chapter_01011.html#con_1240966

[Harold Ritter · Accepted solution]

Hi @Okejo ,

You can achieve your requirement with the following approach.

1. set a different community when you redistribute the connected, static and ospf routes in BGP under the vrf. For example 1:1 for connected, 1:2 for static and 1:3 for ospf routes.

2. in the export policy set the rt based on the community as follow:

route-policy export-policy
if community matches-any (1:1) then
set extcommunity rt (1:1)
endif
if community matches-any (1:2) then
set extcommunity rt (1:2)
endif
if community matches-any (1:3) then
set extcommunity rt (1:3)
endif
end-policy

[Okejo]

Thank you!

[Harold Ritter]

You are very welcome @Okejo and thanks for the feedback