On 13/12/12 14:15, Jason Lixfeld wrote:
On 2012-12-13, at 4:29 AM, Adam Vitkovsky <[email protected]> wrote:
Using common RD in a vrf is asking for trouble if route-reflection is used.
Let's say you have two PEs advertising default for vrf inet -if you use RRs
to spread the routes throughout the backbone -RRs will only advertise one
(best path)default route to all PEs.
Now with unique RD per PE RRs will consider default form each PE as a unique
route sending both to all PEs.
Than you are ready for fast convergence.
adam
Hold on, are you saying that within a single VRF, you can actually use more
than one RD?
Yes. In fact, that's *required* if you want to do multi-path.
route target controls what gets "into" a VRF. RD is just a unique value
that prefixes the route. It can be completely different.
FWIW we use the convention of:
xxx:N
...where N is the last octet of the routers loopback, so the RD is
different on each router.
There are differing opinions about the wisdom of this strategy - see
here, for example:
http://blog.ioshints.info/2012/07/bgp-route-replication-in-mplsvpn-pe.html
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