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New Member

Route-target propagation from PE up to CE


Little question for expert please.

Is there a way to propagate RT extended community from PE to CE ? (ie : on an address family ipv4 eBGP neighbor)

During my tests, I activated "send extended community ebgp" from PE to CE and successfully verified that the RT was propagated on the CE side.

Unfortunately, the RT tag is not inserted in the BGP table and so are not usable for route-maps on the CE side.

Perhaps I'm missing a magical command to activate on the CE...

Thanks a lot for your opinion.


  • XR OS and Platforms
Everyone's tags (5)
Cisco Employee

Route-target propagation from PE up to CE


Are you running vrf on the CE interface connecting to the PE


New Member

Route-target propagation from PE up to CE


Yes we are.

After some tips by another way, I finally get the following information :

IOS-XR respect the section 7.4.d of RFC 4364 (

Specifically the following point :

The CE may suggest a particular Route Target for each

route, from among the Route Targets that the PE is

authorized to attach to the route.  The PE would then

attach only the suggested Route Target, rather than

the full set.  This gives the CE administrator some

dynamic control of the distribution of routes from

the CE.

Even if this trick is given on the way CE to PE, I tried it on my use case and, if you export "every RT" on the CE side, it keeps only the RT matching the one sent by the PE

(a bit weird, but it's "working")

If you have another point a view, I'm interrested to ear it.


New Member

Route-target propagation from PE up to CE

This sounds pretty interesting, what type of a problem are you trying to solve with this? Can you elaborate on the design requiremtent.