On 11 Sep, 2009, at 09:30, Serge Vautour wrote:
Hello,
We're in the process of planning for an MPLS network that will use
BGP for signaling between PEs. This will be a BGP free Core (i.e. no
BGP on the P routers). What are folks doing for iBGP in this case?
Full Mesh? Full Mesh the Main POP PEs and Route Reflect to some
outlining PEs? Are folks using dedicated/centralized Route
Reflectors (redundant of course)? What about using some of the P
routers as the Centralized Route Reflectors? The boxes aren't doing
much from a Control Plane perspective, why not use them as Route
Reflectors.
serge,
you can, and probably should, segment your mpls signalling ibgp from
your internet/peering ibgp. in other words, on your pe, you configure
ipv4/ipv6 bgp sessions to your peering/transit routers, then you
configure mp-bgp sessions to three or four mpls vpn route reflectors.
the mpls route reflectors do not participate in the actual routing of
any packets (they don't set next-hop-self, only the pe routers would),
their only function is to reflect the vpn signalling between disparate
pe boxen.
similarly, if you have a very large number of pe routers, you can
setup three or four boxes to reflect internet/customer routes...these
boxes also would not route any packets, they would just reflect the
non-mpls bgp sessions (they don't set next-hop-self, only the pe/
transit/peering router do).
alternately, if you have local transit/peering routers at every pe
site, then you can mesh all the transit/peering routers and have the
local pe routers be rr clients of that site's transit/peering routers
hth
/joshua
