Loop Prevention MPLS VPN

Hi Group,

Given the following:

                 CE2
                  |
                  | OSPF
                  |
                PE-3
                  |
                  |
                  |
                  |
         MPLS Core
                  |
                  |
                  |
                  |
PE-1-----MPLS------PE2
| |
| |
| |
| |
|------ CE-1 ---------|
 
mBGP is configured as follows:

PE-1---- PE-3
PE-1---- PE-2
PE-2---- PE-3

Also assume OSPF process between the CE devices & the PEs are redistributed
into BGP & vice versa. So VPN routes are learnt by both CE routers so
end-to-end connectivity within the VRF has been achieved
The OSPF process within the VRF does not run between PE-1 & PE-2 so a loop
could be created when routes learnt from PE-3 are redistributed to the VRF OSPF
process.
Now suppose PE-3 has a second interface that is not running OSPF within the VRF
& that interface is redistributed into both the OSPF process with CE2 & the
mBGP to PE1- & PE-2. This new route will be prefered via OSPF by PE-1 & PE-2.
Can someone please indicate what methods & approaches they would use to filter
the redistributed route?

Thanks in advance

PE-1 & PE-2 both learn the

Blogs and organic groups at http://www.ccie.net
Received on Mon Nov 29 2010 - 11:47:59 ART