can someone suggest on the design. we had some issues recently
Customer site A ISP-WAN-R1,ISP-WAN-R2, CUSt-WAN-R1 and CUSt-WAN-R2 run ospf and have their own area , area 0
CUST-WAN-R1, CUST-WAN-R2, CUST-LAN-6509A and CUST-LAN-6509B run ospf and have their own area , area 0
6509A and 6509B have networks 10.1.0.0 and 22.214.171.124. they are annouced using ospf by them CUST-WAN-R1 and CUST-WAN-R2 learn about these networks CUST-WAN-R1 and CUST-WAN-R2 with thier OSPF running send infor about network 10.1.0.0 and 126.96.36.199 to ISP-WAN-R1 and ISP-WAN-R2
ISP-WAN-R1 and ISP-WAN-R2 have EBGP configured and they send these routes into MPLS cloud to reach customer site b and customer site c ISP-WAN-R1 and ISP-WAN-R2 should send routes of customer site b and c to
At customer site B and customer site C, there is similar set up to Customer site A
what is requried is no load balancing but have a primary path as shown in the attachment and have a backup path
how should OSPF be configured at all customer sites? how should BGP be configured on ISP WAN routers at all sites? there was issue recently when both CUST-WAN-R1 and CUST-WAN-R2 stopped sending traffic to 10.1.0.0 and 188.8.131.52 both these routers were not learning them from CUSt-WAN-R1 and CUSt-WAN-R2 via ospf but in thier routing table there was EBGP with AD 20/0 for 10.1.0.0 and 184.108.40.206
The part you're describing in the last semtence is very common in BGP / OSPF MPLS environments. eBGP routes have an AD of 20, OSPF routes have an AD of 110. Therefore, eBGP routes are preferred and the traffic gets routed back to the MPLS cloud rather than taking OSPF.
The easy way to fix this is "BGP backdoor", which will change the AD to 200. OSPF routes will then be preferred.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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