Routing Issue

[Joe Lee]

Hi,

Attached is the network diagram and the configuration of the routers and switches.

Between router A and B, we run eBGP, between router A and switch A, and between router B and switch B, we run EIGRP. Each switch, we have two VLAN's. If I don't have the routing" ip route 0.0.0.0 0.0.0.0 x.x.x.x" configured on the switch, the user from the other location is not able to reach the VLAN2. and between router and switch, we have EIGRP. How come we still need this routing statement on the switch? Please explain in more detail if possible, or any documenation will be helpful.

Thanks!

[Varun Uniyal · Accepted solution]

The most simple explanation would be that the swithc that you are adding  the default route on is not learning a specific route for the remote  site through EIGRP...your EIGRP configuration seems quite simple and no filtering is done. So i would assume that you are either not advertising the required prefix or even if you are you are not redistributing between EIGRP and BGP on the routers.

Try this on both routers A and B:

router eigrp 10

redistribute bgp 20 metric 10000 100 255 1 1500

router bgp 20

residtribute eigrp 10

[cadet alain]

Hi,

if you want BGP to know about the VLANs subnets you must redistribute them in BGP on router or use a network command.

Then they will be advertised to your BGP peer which will advertise them to switch if you redistribute BGP into EIGRP.

Have you cut off some config before posting?

Regards.

Alain.

[Joe Lee]

Hi,

We do redistribute the eigrp in BGP on each router in each locaton, but we don't redistribute the bgp in eigrp on the router. Just want to clarify that we need to redistribute the bgp in eigrp on the router and we can remove the static route" ip route 0.0.0.0 0.0.0.0 x.x.x.x" on the switch at each site, right?

Regards,

Joe

[cadet alain · Accepted solution]

Yes you're right.

Regards.

Alain.