Hello Matthew,

the route-map should be used to set one or more BGP attributes of the IP prefix referenced by the network command

what if you use only the last route-map clause?

Example:

route-map LAN_to_BGP2 permit 100
set metric 50

Hope to help

Giuseppe

Hi Giuslar,

I got a requirement to deny all those routes with tag 7001 and 7002.

I just want to understand

1. Is there any problem with route-map ?

2. Is the route-map working different for network command than the neighbor command?

Regards

Mathew

Hi,

When I am applying the route-map and debug , I am getting below logs..

*Mar  1 00:41:49.783: BGP(0): delete invalid sourced route for 193.122.25.0/24 path 0
*Mar  1 00:41:49.787: BGP(0): no valid path for 193.122.25.0/24
*Mar  1 00:41:50.539: BGP(0): nettable_walker 193.122.25.0/24 no best path
*Mar  1 00:41:50.543: BGP(0): 10.255.200.157 send unreachable 193.122.25.0/24
*Mar  1 00:41:50.543: BGP(0): 10.255.200.157 send UPDATE 193.122.25.0/24 -- unreachable

Regards

Mathew

Hello Mathew,

>> 2. Is the route-map working different for network command than the neighbor command?

I would say yes, when used with the network command the route-map should be used only for setting BGP attributes of the IP prefix that matches that network command

when used towards a neighbor a route-map can act as a route filter and can deny some routes based on different criteria including route tag = 7001 or route tag = 7002.

you can still implement a second route-map towards neighbor where you deny routes with that specific route tag values.

the debug shows that the network is considered not valid. but we know it is a connected route, it is actullay the IP address of a test loopbck or there is a static route using as next-hop the loopback address?

the debug can show the effects of using a route-map like that with the network command

Hope to help

Giuseppe

Thanks Giuslar..

Do you have any document reference for the route-map used for network command ? I serached but didn't find any document which says the difference between the route-maps for network and neighbor command.

Regards

Mathew

Hello Mathew,

I agree that documentation is not clear about this

even command reference reports generic information

http://www.cisco.com/en/US/docs/ios/iproute_bgp/command/reference/irg_bgp4.html#wp1098414

But if we think about the logic that is behind the command we should agree that:

given the following BGP command:

network 193.122.25.0 route-map  test

a) applies only to IP prefix 193.122.25.0/24

b) route-map test at this point should do something related to prefix 193.122.25.0/24 like setting metric (MED) to 50 no filtering action is required here because only one IP prefix is involved

in other words if I don't want to advertise a prefix I simply do not use a network command for that prefix.

If I use the network command I'm referring to a specific IP prefix.

On the other hand if I use a route-map towards a neighbor things are different all BGP prefixes in local BGP table are processed by the route-map and some filtering action is expected and performed.

Hope to help

Giuseppe