[c-nsp] tag-switching advertise-tags for?
Aamer Akhter (aakhter)
aakhter at cisco.com
Tue Oct 25 09:00:34 EDT 2005
> If I understood you correctly, I'll need an extra lo on each
> PE (one for
> vpnv4 BGP peering, one for ipv4 peering, twice as many BGP
> sessions, and
> will have to set things up so that each session is strictly
> vpnv4 or ipv4,
> but not both (or only accepts routes in the appropriate
> address-family).
Jon,
Just to clarify, there is a way to have single session which shares ipv4 + vpnv4 and a relatively simple config.
You'll need to have 2 loopbacks: one for ipv4 another for vpnv4. Additionally, you'll need one route-map: to change the next-hop to one of the loopbacks per address-family. The other loopback will be set by default.
hth
--
Aamer Akhter / aa at cisco.com
NSITE - cisco Systems
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jon Lewis
> Sent: Monday, October 24, 2005 6:37 PM
> To: Robert Kiessling
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] tag-switching advertise-tags for?
>
> On Mon, 24 Oct 2005, Robert Kiessling wrote:
>
> >> tables or policy routing. Do all the PE router lo0's have
> to be advertised
> >> into TDP/LDP for MPLS-VPN tag switching to work?
> >
> > All your loopbacks that are nexthops for BGP in the vpnv4 address
> > family have to be advertised by LDP, and only those have to.
> >
> >> How/why would traffic to bgp learned non vpnv4 prefixes be
> label-switched
> >> if tags for those prefixes were not advertised?
> >
> > If the next hop is label switched, then the prefix itself
> > is too.
>
> That sucks...so getting our non-MPLS traffic routed instead of
> tag-switched is actually going to be much more complicated
> (or at least
> more work) than just tag-switching advertise-tags for <acl>
> on all the
> PEs.
>
> If I understood you correctly, I'll need an extra lo on each
> PE (one for
> vpnv4 BGP peering, one for ipv4 peering, twice as many BGP
> sessions, and
> will have to set things up so that each session is strictly
> vpnv4 or ipv4,
> but not both (or only accepts routes in the appropriate
> address-family).
>
> ----------------------------------------------------------------------
> Jon Lewis | I route
> Senior Network Engineer | therefore you are
> Atlantic Net |
> _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
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