On Tue, Nov 20, 2001 at 11:05:06AM +0530, pankaj wrote:
>
> Now i want to receive traffic of two subnet A and B
> from ISP A, Subnet C, D from ISPB .
> If Isp A fails all traffic should come from B and if ISP B
> fails all traffic should come from ISPA.
announce all prefixes to both providers, with route-maps that prepend your AS to the "backup" provider for the prefixes you wish the provider to be backup for.
e.g. if you're AS100, your ISP-A is AS200, your ISP-B is AS300..
ip prefix-list ISP-A-backup permit 10.10.0.0/16
ip prefix-list ISP-B-backup permit 10.11.0.0/16
ip prefix-list announce permit 10.10.0.0/16
ip prefix-list announce permit 10.11.0.0/16
route-map ISP-A permit 10
match ip address prefix-list ISP-A-backup
set as-path prepend 100
route-map ISP-B permit 10
match ip address prefix-list ISP-B-backup
set as-path perpend 100
router bgp 100
network 10.10.0.0 mask 255.255.0.0
network 10.11.0.0 mask 255.255.0.0
neighbor 1.2.3.4 remote-as 200
neighbor 1.2.3.4 next-hop-self
neighbor 1.2.3.4 prefix-list announce out
neighbor 1.2.3.4 route-map ISP-A out
no auto-summary
dont forget to have an IGP/IBGP route for each of the network/mask pairs you have listed in the bgp router, etc, etc.
for more, read:
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/icsbgp4.htm
and check out the stuff in:
http://www.cisco.com/public/cons/
-amf
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