Re: MPLS Route Targets

Ah! I think the confusion here is the purpose of the command. The purpose is
to prevent a PE router from making those route-targets visible to ANY
upstream BGP peer that does not configure the RT that matched the Downstream
PE.

That said, If the 2 EBGP P routers can remove the route-target filter and
use the inner most label to send traffic, then the command is NOT REQUIRED
to pass on RD and RT information with the (NON-LDP) VPNv4 EBGP peer. Try and
say that 10 times. Crap!! :-)

Does this make sense?

-- 
Paul Negron
CCIE# 14856 CCSI# 22752
Senior Technical Instructor
www.micronicstraining.com
> From: Carlos G Mendioroz <tron_at_huapi.ba.ar>
> Date: Sat, 21 Aug 2010 08:02:43 -0300
> To: Paul Negron <negron.paul_at_gmail.com>
> Cc: Adam Booth <adam.booth_at_gmail.com>, Brad Edgeworth <edgie512_at_gmail.com>,
> Cisco certification <ccielab_at_groupstudy.com>
> Subject: Re: MPLS Route Targets
> 
> Cool.
> Just one question, as I have never labbed nor have experience in
> inter-AS mpls vpns: You say "in order to see" the route targets,
> but my impression of the command (no bgp default route-target filter)
> is that it actually filters, so for a reflector or a vpnv4 eBGP peer,
> you would actually need it in order to exchange such routes
> (those with no RTs used by local VRFs). Is that correct ?
> 
> Thanks,
> -Carlos
> 
> Paul Negron @ 20/08/2010 21:52 -0300 dixit:
>> All,
>> 
>> When configuring Inter-AS VPN, The P routers ARE participating in BGP under
>> the VPNv4 Address-Family and will use the inner label to switch from carrier
>> to carrier. The default route target must be lifted in order to see the
>> route-targets on the P router. The only other way I know of is to configure
>> the route-targets on a vrf that is on the P router but not applied to any
>> interfaces.
>> 
>> A similar problem would take place when using Confederations.
>> 
>> The command that dumps the information on that P router or ANY router that
>> the route-targets are not configured on, is " no bgp default route-target
>> filter" under the BGP process. All of the RD information is seen. Even more
>> than a router that has the RT's configured.
>> 
>> 
>> Paul
> 
> -- 
> Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
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