06-21-2009 10:47 AM - edited 03-04-2019 05:11 AM
Hi,
Our Service Provider provides remote office connection though MPLS using BGP.
when I do sh ip route , i see lots of unwanted routes.
can someone help with correct route-map filter commands to restrict these routes.
Interface connected to Service-provider network Serial 0/0
Interface connected to LAN Fe 0/1
**************
HeadQuarters**
**************
interface s 0/0
ip address 172.16.100.1/30
interface e 0/1
ip address 192.168.1.140/30
Other networks are 192.168.5.0/24
172.20.2.0/21
Remote Office network is 10.10.10.0/23 &&
192.168.100.0/24
Unwanted network from service provider
88.80.76.0/24
172.16.105/24
172.16.99.0/24
85.15.77.0/23
06-21-2009 10:57 AM
Hi Ron,
You can apply a prefix-list inbound to the updates coming from the Service Provider. Prefix-lists are faster and require less processor cycles.
Example:
ip prefix-list TEST seq 5 deny 88.80.76.0/24
ip prefix-list TEST seq 10 deny 172.16.105/24
ip prefix-list TEST seq 15 deny 172.16.99.0/24
ip prefix-list TEST seq 20 deny 85.15.77.0/23
ip prefix-list TEST seq 25 permit 0.0.0.0/0 le 32 (this line permits everything else that is not denied by earlier statements)
router bgp xxx
neighbor y.y.y.y prefix-list TEST in (y.y.y.y is the service provider neighbor router ip address).
Cheers:
Istvan
06-21-2009 12:37 PM
Thanks.
Can you help with route-map commands as well.
06-21-2009 08:49 PM
Hi Ron,
The same can be implemented on route-map the following way:
access-list 1 permit 88.80.76.0 0.0.0.255
access-list 1 permit 172.16.105.0 0.0.0.255
access-list 1 permit 172.16.99.0 0.0.0.255
access-list 1 permit 88.15.77.0 0.0.0.255
route-map FROM_SP deny 10
match ip address 1
route-map FROM_SP permit 20
router bgp xxx
neighbor y.y.y.y route-map FROM_SP in
Cheers:
Istvan
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