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Route Exchange between CE and PE

  • From: Robert Raszuk <raszuk@cisco.com>
  • Date: Mon, 30 Oct 2000 22:38:46 -0800
  • CC: mpls@UU.NET
  • Organization: Signature: http://www.employees.org/~raszuk/sig/

> Wayne wrote:
> 
> Hi,
> 
> I am reading the RFC2547bis and came up with a question for route
> exchange between the CE and PE. Suppose there are 2 CEs belongs to
> different VRFs and connect to the same PE. RIP is used to exchange
> routing. Though there is 2 different VRFs in the PE, would the RIP
> process in it re-advertise the learned routes to the other CE in
> another VPN?

Not really. RIP on PE-CE1 would be isolated by implementation with the
RIP PE-CE2. Re-advertising or inter-vrf importing is done via bgp based
on the ext comunities values.

> The RFC also suggests other routing options. Other the
> static route implementation, I cannot find an answer for it. But I may
> miss some important point while reading. Could anyone show me how this
> can be solved?

You can in fact implement any IGP between PE-CE. All you need to make
sure that the routes learned by one context will be isolated by another
inside your PE.

R.