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bgp community

bmuggall
Beginner
Beginner

Hi,

   I was trying the following scenario in my GNS simulator. I could not see bgp community attribute taking effect. Please let me know what is going wrong here.

|R7|------|R5|

R7:

==

router bgp 200

no synchronization

bgp log-neighbor-changes

network 70.1.1.0 mask 255.255.255.0

network 70.1.2.0 mask 255.255.255.0

aggregate-address 70.1.0.0 255.255.252.0

neighbor 5.5.5.5 remote-as 100

neighbor 5.5.5.5 ebgp-multihop 2

neighbor 5.5.5.5 update-source Loopback0

neighbor 5.5.5.5 next-hop-self

neighbor 5.5.5.5 route-map lab_3 out

auto-summary

R7#show route-map lab_3

route-map lab_3, permit, sequence 10

  Match clauses:

    ip address (access-lists): 106

  Set clauses:

    community no-export

  Policy routing matches: 0 packets, 0 bytes

route-map lab_3, permit, sequence 20

  Match clauses:

  Set clauses:

    community none

  Policy routing matches: 0 packets, 0 bytes

R7#

R7#

R7#show ip access

R7#show ip access-lists 106

Extended IP access list 106

    10 permit ip 70.1.0.0 0.0.3.255 any (3 matches)

R7#

R5:

==

router bgp 100

no synchronization

bgp log-neighbor-changes

network 40.1.1.0

network 40.1.1.0 mask 255.255.255.0

network 100.0.0.0

network 112.1.1.0

network 112.1.1.0 mask 255.255.255.0

neighbor 7.7.7.7 remote-as 200

neighbor 7.7.7.7 ebgp-multihop 2

neighbor 7.7.7.7 update-source Loopback0

neighbor 20.1.1.1 remote-as 100

neighbor 30.1.1.1 remote-as 100

neighbor 30.1.1.1 next-hop-self

auto-summary

R5#show ip bgp

BGP table version is 395, local router ID is 40.1.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path

*>i20.1.1.0/24      30.1.1.1                 0    100      0 i

r>i30.1.1.0/24      30.1.1.1                 0    100      0 i

*> 40.1.1.0/24      0.0.0.0                  0         32768 i

*> 70.1.0.0/22      7.7.7.7                  0             0 200 i

*> 70.1.1.0/24      7.7.7.7                  0             0 200 i

*> 70.1.2.0/24      7.7.7.7                  0             0 200 i

*> 100.0.0.0        40.1.1.2                 0         32768 i

*> 112.1.1.0/24     0.0.0.0                  0         32768 i

R5#

R5#

R5#show ip bgp community

R5#

As shown above, I am  not seeing community attribute on R5 even when I configured route-map on R7. Could you please let me know your thoughts on this.

2 Replies 2

cadet alain
Mentor
Mentor

Hi,

by default the router doesn't send the community attribute, you must issue neighbor x.x.x.x  send-community  command.

Regards.

Alain

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Thats great. That solved the issue. Thanks a lot.

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