My questions are: Should I continue to use a single ASN for all bgp peers? currently using '1'
At Tower1, should I use a single instance to both connect to Core and to Towers 2,3,4, or should I have an 'upstream' instance and a 'downstream', or even a different instance for each tower I connect to?
For route filters, should I be doing accepts and only allowing specific networks through? Or should I be letting anything through and disguarding certain networks?
Finally, when to use route-reflect. Just at Tower1 so that Towers2,3, and 4 can get those routes?
Joined: Thu Jan 27, 2011 8:29 am Posts: 221
just to throw a kink in here, I plan on deploying an HWMP+ mesh on this and giving each tower router a public IP on the mesh and eventually routing clients through the mesh.
When I do that I will have a separate bgp tree on the mesh, but because the mesh is a single layer2 I will just have the core mesh node with route reflect on and the sites as peers, all of which on a separate bgp instance. (unless I am told that is the wrong way to do it.)
Joined: Sat Apr 04, 2009 3:45 am Posts: 933
Location: Østfold - Norway
run a main ebgp at core router. Then try confederation with different AS in all ibgp routers. make sure u have a connection between all routers, who will act as multihomed (redundant) links. if stright r1-r2-r3-r4 and no r2-r3and4 its no good use of bgp. Just stight forward routes.
And how many "real" eBGP sessions (on different routers) do you have there? iBGP's main idea is that the eBGP routers should "discuss" the routes received from their peers and decide, how to route the traffic outside. For routing inside one "real" AS - BGP is too "heavy" and complicated, and THAT'S WHY people invented some better routing protocols - like OSPF!
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