@Richard Burtsmy thinking is this; we are using dynamic routing because we have dual redundant links. If i use PBR to override routing and set a next hop, i want to avoid the situation where that next hop cant get to the destination because of an impasse further down that link.
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I have a setup with 3 sites. Site's 1 and 2 are data centres and interconnect via a layer 3 link using EIGRP. Site 3 is remote. Comms between Site 1 & 3 (WAN A) and site 2 & 3 (WAN B) is controlled by BGP. Each site has a router and core switch, internal comms at each site uses EIGRP. Normal operation sees all traffic between the data centers and site 3 use the WAN link from site 1 to 3 (WAN A). So traffic from site 2 to 3 will traverse site 1. Ive been asked if the standby link (B) between sites 2 & 3 can be used for some traffic. For example, traffic between 184.108.40.206 (sites 1/2) and 220.127.116.11 (at site 3) should use WAN B. I'd imagine policy based routing specifying specific source and destination IPs would override the default costs to make WAN B preferred. However, routing from 1/2 to 3 has me scratching my head. I want site1/2 to look at each packet and, if source is 18.104.22.168 and destination is 22.214.171.124, route via WAN B if 126.96.36.199 is being advertised as a reachable destination via B. If the source is not 188.8.131.52, then route to 184.108.40.206 via A as usual. If it were just static routes being used, this would be straightforward. The use of EIGRP and BGP makes it less so.
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