Cisco IOS XR - redistribute from BGP to OSPF filtering on community.

[jvoorend]

I am wanting to filter routes from BGP to OSPF based on the BGP community:

Have the following setup:

community-set GLF_Local_910

  910:910

end-set

route-policy BGP-To-CMN

  if community matches-any GLF_Local_910 then

    pass

  else

    drop

  endif

end-policy

When I apply the following to the ospf process:

redistribute bgp 4288888888 tag 660 route-policy BGP-To-CMN

I get the following:

router ospf 10
redistribute bgp 4288888888 tag 660 route-policy BGP-To-CMN
!!% Could not find entry in list: Policy [BGP-To-CMN] uses the 'community' attribute. There is no 'community' attribute at the ospf redistribution attach point.
!

Is there a way under IOS XR to filter from BGP to OSPF based on the community ?

Kind Regards

John

[balaji.bandi]

check the below thread :

https://community.cisco.com/t5/routing/ios-xr-route-policy-matching-community-problem/td-p/3732661

[jvoorend]

Thank you for that - I actually saw that thread however:

Mention is made of the below as a solution:

"You could set a tag based on the community using a table-policy under the proper address-family and then use this tag to conditionally redistributed the routes in OSPF"

What is a "table-policy" and do you have an example of this ?

Kind Regards

[balaji.bandi]

try below example :

https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-5/routing/configuration/guide/b-routing-cg-asr9000-65x/b-routing-cg-asr9000-65x_chapter_01011.html#con_1310956

https://www.cisco.com/c/en/us/td/docs/routers/xr12000/software/xr12k_r4-0/routing/configuration/guide/rc40xr12k_chapter7.html#con_1117278

[Harold Ritter]

Hi @jvoorend ,

The table-policy is configured to filter routes from the BGP local rib to the routing table. What you want to achieve would look something like this.

route-policy bgp2rib
if community matches-any (xxx:xxx) then
set tag 999
endif
end-policy

!

route-policy rib2ospf
if tag eq 999 then
pass
endif
end-policy
!

router ospf xxx

redistribute bgp xxx route-policy rib2ospf

!

router bgp xxx
address-family ipv4 unicast
table-policy bgp2rib
!

Regards,

[jvoorend]

Many thanks for that - it worked a treat.

Kind Regards

John