----- Original Message -----
Sent: Wednesday, January 28, 2004 12:44
PM
Subject: Re: [MPLS-OPS]: Aggregate routes
Import & export within VRF's on the same PE's
I guess the example given by M. Elk was a bad one (the specifics are a
subset of the aggregate but not a complete set).
I guess if I could rephrase the question, based on what I understood from
the reply he sent:
Assume we have 192.168.0.0/16 and 192.168.1.0/16 in VRF
Green
This can be aggregated to 192.168.0.0/17.
Now when we propogate the routes using export and import RT, how are the
routes propogated to VRF Red on the same PE?
Will the interface routes also be advertised in this case?
My guess is yes as the most specific would be advertised.
In this particular case above, my guess is the aggregate would never be
advertised.
Is this correct?
(Incase one was to not bother about most specific but only
about protocol metrics, then maybe even the aggregate could be advertised, but
that could be avoided by pulling up the cost associated with the next-hop
null0/or using a policy map which sends only aggregate to remote PE
routers.)
M.Elk, was this what you wanted to clarify?
Piotr Marecki <piotr.marecki@tdcinternet.pl>
wrote:
>
>
2- Specific to cisco implementation .
> guess the above as configured
is not workable ,ie: 10.9/16 will not
show
> in VRF red
>
neither 10.10/16 in VRF green , is it correct ?
Actually all
aggregates will appear in other vrf with next-hop null0.Of
course
more
specific , ie static routes will also appear in other vrf with
next-hop
of
proper vrf intf. Moreover , on others PE ( MP_BGP ) you
'll also see other
agregate ( with proper
route-target import) . PE
LFIB will contain Aggregate as an action connected
with every aggregated
prefix.
regards
Piotr Marecki
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