From: David FAHED (dfahed@xxxxxxxxxxxx)
Date: Sun Feb 25 2001 - 09:49:37 GMT-3
The communities are not propagatedto internal or external BGP neighbors by
default. The send-community option is required in order for the assigned
community to be sent out.
And you need to use the community no-export to avoid the route to be
propagated ....
Nigel Taylor wrote:
> All,
> I just got done working through lab 325 - Adv BGP Routing and I was =
> hoping someone could tell me if I'm missing something or =
> misunderstanding the requirements for task (11) eleven. The =
> requirements calls for the implementation of communitites attribute to =
> dynamically limit the advertisment of an external learned network route =
> from AS300 to AS100. In doing so I accomplished this with the use of =
> applying the following configuration commands. In the fatkid solution =
> they make use of the command "send-community" on every bgp peer =
> connection. Based on the requirements I don't think this necessary? =
> Anyone did this lab and had the same questions or thoughts..
>
> Nigel.
>
> R2:
> router bgp 200
> bgp router-id 190.19.15.145
> redistribute eigrp 200 route-map localnet
> neighbor 190.19.15.177 remote-as 200
> neighbor 190.19.15.177 update-source Loopback0
> neighbor 190.19.15.177 send-community
> neighbor 190.19.15.177 route-map setcom out
> neighbor 210.10.10.5 remote-as 300
> neighbor 210.10.10.5 weight 450
> no auto-summary
> !
> ip classless
> !
> dialer-list 1 protocol ip permit
> route-map setcom permit 10
> set community no-export
>
> R3:
> router bgp 200
> bgp router-id 190.19.15.161
> redistribute eigrp 200 route-map localnet
> neighbor 190.19.15.177 remote-as 200
> neighbor 190.19.15.177 update-source Loopback0
> neighbor 190.19.15.177 send-community
> neighbor 190.19.15.177 route-map setcom out
> neighbor 210.10.10.1 remote-as 300
> no auto-summary
> !
> ip classless
> !
> dialer-list 1 protocol ip permit
> route-map setcom permit 10
> set community no-export
>
> R4:
> router bgp 200
> bgp router-id 190.19.15.177
> bgp log-neighbor-changes
> redistribute eigrp 200 route-map localnet
> neighbor 190.19.15.145 remote-as 200
> neighbor 190.19.15.145 update-source Loopback0
> neighbor 190.19.15.145 route-reflector-client
> neighbor 190.19.15.161 remote-as 200
> neighbor 190.19.15.161 update-source Loopback0
> neighbor 190.19.15.161 route-reflector-client
> neighbor 192.19.15.1 remote-as 100
> neighbor 192.19.15.1 route-map weight250 in
> no auto-summary
>
> R4#sh ip bgp
> BGP table version is 25, local router ID is 190.19.15.177
> Status codes: s suppressed, d damped, h history, * valid, > best, i - =
> internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
> *> 20.1.1.0/24 192.19.15.1 0 250 100 i
> *> 22.1.1.0/24 192.19.15.1 0 250 100 i
> *> 24.1.1.0/24 192.19.15.1 0 250 100 i
> * i190.1.0.0 210.10.10.1 0 100 0 300 i
> *>i 210.10.10.5 0 100 0 300 i
> *> 190.19.15.0/26 0.0.0.0 0 32768 ?
> * i 190.19.15.161 0 100 0 ?
> *> 190.19.15.64/26 0.0.0.0 0 32768 ?
> * i 190.19.15.145 0 100 0 ?
> *> 190.19.15.128/28 190.19.15.66 40537600 32768 ?
> * i 190.19.15.161 0 100 0 ?
> * i 190.19.15.145 0 100 0 ?
> *> 190.19.15.129/32 190.19.15.2 40537600 32768 ?
> * i 190.19.15.161 0 100 0 ?
> *> 190.19.15.130/32 190.19.15.66 40537600 32768 ?
> * i 190.19.15.145 0 100 0 ?
> *> 190.19.15.144/28 190.19.15.66 409600 32768 ?
> * i 190.19.15.145 0 100 0 ?
> Network Next Hop Metric LocPrf Weight Path
> *> 190.19.15.160/28 190.19.15.2 409600 32768 ?
> * i 190.19.15.161 0 100 0 ?
> *> 190.19.15.176/28 0.0.0.0 0 32768 ?
> *> 192.19.15.0 0.0.0.0 0 32768 ?
> *> 210.10.10.0/30 190.19.15.2 2195456 32768 ?
> * i 190.19.15.161 0 100 0 ?
> *> 210.10.10.4/30 190.19.15.66 2195456 32768 ?
> * i 190.19.15.145 0 100 0 ?
> r3_14#
>
> r4#sh ip bgp 190.1.0.0=20
> BGP routing table entry for 190.1.0.0/16, version 2
> Paths: (2 available, best #2, table Default-IP-Routing-Table, not =
> advertised to EBGP peer)
> Advertised to non peer-group peers:
> 190.19.15.161=20
> 300, (Received from a RR-client)
> 210.10.10.1 (metric 2195456) from 190.19.15.161 (190.19.15.161)
> Origin IGP, metric 0, localpref 100, valid, internal, synchronized
> Community: no-export
> 300, (Received from a RR-client)
> 210.10.10.5 (metric 2195456) from 190.19.15.145 (190.19.15.145)
> Origin IGP, metric 0, localpref 100, valid, internal, =
> synchronized, best
> Community: no-export
>
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