indeed I make it simpler.... - network is already running with ospf (very sensite traffic) - the concept is A-C-B-A as you correctly understood, but there are between A and B 4 links with 4 big MXs on each side and on C there are two different big SRX, hence topology is not so easier - traffic is OSPF over IPSEC on each link - the idea is to find a solution under the current config/topology/routing domain, otherwise if I was enabled to rebuild everything I'd do in different way...
Subject: Re: [j-nsp] Junos ospf question From: [email protected] Date: Wed, 25 Sep 2013 11:32:01 +0200 CC: [email protected]; [email protected] To: [email protected] First let me see if I understand you correctly by rephrasing. - Three sites A, B och C all connected with direct links- Link A-B has high capacity- Links A-C and B-C has lower capacity- High volume storage traffic traverses link A-B and must not use links A-C or B-C, even if link A-B goes down- There is also other low-volume traffic between all sites that should be routed around possible broken links. Why not first try to solve it the easy way instead of using routing magic? - If the high-volume storage traffic has static addressing that is unique, you can use static routes that are NOT exported into OSPF. If the easy way does not apply, there is a slightly more complex way to do it: - If you can classify storage traffic statically with a filter, use FBF to direct that traffic to a static default route in another routing instance. I don't really recommend it, but there are high-tech alternatives that do about the same as FBF in this case, but in a more "interesting" way. Usually you should always think KISS in production, but I must mention it: Multitopology routing. With MT routing one OSPF instance can have more than one topology active, in this case one with only A and B present, and another where all of A, B and C are present. You then classify the ingress traffic and assign it to one of the topologies (by using their specific routing/forwarding table). Here is a link to where you can get started: http://www.juniper.net/techpubs/en_US/junos12.1/topics/usage-guidelines/routing-configuring-multitopology-routing-in-ospf.html . Remember: I don't recommend it! /Per 25 sep 2013 kl. 10:39 skrev R S <[email protected]>:basically I've a triangulation A - B - C - A single area 0 A-B link is 10Gbs A-C and B-C is 1 Gbs since in A-B run a very high volume of traffic (storage), I do not want if A-B fails this traffic goes through C C redistribute as well statics into OSPF Hope it clear now _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
