Hi,
I have a question regarding redistributing routes from BGP to OSPF in a L3VPN
setup. I've got limited experience in this area, so please excuse if the
question is incorrectly formulated.
The topology is like this
P -- PE1 -- CE1
| |
PE2 - PE3
|\ /|
| \ / |
| X |
| / \ |
CE2 - CE3
A subnet is directly connected to PE1 from CE1, no OSPF. PE1 is doing
address-family ipv4 vrf CUST-A
redistribute connected
exit-address-family
PE2 and PE3 (ASR9K) are doing OSPF with CE2 and CE3. PE2 and PE3 are
redistributing from BGP into OSPF, today no route-maps etc.
Now to the question. The subnet from CE1 is redistributed to CE2 and CE3 from
both PE2 and PE3 with the same metric (metric 1, default for BGP into OSPF) .
The result is that CE2 and CE3 have to equal cost routes to the subnet to both
PE2 and PE3. Wouldn't it better if the route to PE2 had a higher metric so that
when all links are up the traffic goes via only PE3?
Can we accomplish this in some "automatic" way (we have several VRFs set up in
the same way)? Getting PE2 and PE3 to take into account the IGP cost to reach
PE1 when redistributing? Or do we need to manually create route-maps in PE2 to
set a higher cost for the subnet from CE1 when redistributing into OSPF?
Regards,
/Ulrik Ivers
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