Headquarters will have 2 routers and links (one from each carrier). CE to PE will be running BGP, while internally they will be running iBGP (OSPF) between L3 switch and CE. Remote sites will be configured similar. We want to send non-critical traffic over one carrier, while critical traffic over the other carrier. We want return traffic over the same source link while maintaining redundancy.
What is the best way to influence the routes so they select a particular path for both egress and ingress?
deterministic advertisement of summary routes per egress path (now in english)
Use ospf summary routes to give the carrier running non-critical traffic a less specific route prefix of your internal networks. the more specific routes will be perferred over the "other carrier" for the critical traffic.
I.E. send 172.16.0.0/12 over the "non-critical carrier" and 172.16.1.0/24 over the "critical carrier".
thank you joe. what would you suggest for non-company routes (internet) over the non-critical traffic carrier? The challenge is the return internet traffic from remote, want to insure it routes back through non-critical carrier to remote. FYI: all internet traffic routes through HQ.
I have attached a simple schematic of the network. In this example I am looking at the same host accessing "critical and non-critical traffic" simultaneously. The destination AS and prefix would be the same at the remote end. I know that CEF by default enables destination based sessions, which should have the return traffc follow the same path as the initiated session but I dont know that it can be guaranteed. Hope this clarifies my question.
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