Hey all. I am trying to configured VRF-lite in a Dynamips environment using four 3640 routers (topology is shown in the attached .jpg). For some reason I am just not grasping the concepts behind VRF in general. I have been scouring the Internet for references all day (literally all day) to try and find a blog or a white paper that can "flip the switch" so to speak and get me over the hump. One of the areas that I’m REALLY struggling in is with the idea of RD and RT’s. Is the RD globally unique or not?? For the RT’s, I see some configs that have both the export and import set as the same ASN:nn but in some others I see the export = the local RD and the import = a neighbors export RT. For example:
rtr1
ip vrf rtr1vrf
rd 64512:01
route-target export 64512:01
route-target import 64515:01
rtr2
ip vrf rtr2vrf
rd 64515:01
route-target export 64515:01
route-target import 64512:01
How and why would you set the export and import to be the same?? When I do a sho ip bgp or a show ip bgp neighbor I just get blank lines back, why is that?? I am peering successfully. One last question is in my scenario I don’t want Clutterbuck and Burns to know about each other, but I want Koivu to know about both of them. I thought that I could just configure Clutterbuck and Burns to import routes from 1001:2 and they would only see the routes sourced from Koivu. Do only routes sourced by Koivu get the 1001:2 extended community value?? Do I need to have a distribute-list in place instead?? It just doesn’t make sense. Please give me a swift kick in the skull…
<b>Attachment Keywords : </b>
1) vrf_lite.jpg
2) configs.txt