task: Ensure that the IP prefix for 100.100.101.0 is not propagated beyond
AS 8888. Why don't I see 100.100.100.0 advertised?
r4
router bgp 65522
no synchronization
bgp log-neighbor-changes
bgp confederation identifier 8888
bgp confederation peers 65511 65533
network 100.100.100.0 mask 255.255.255.0
network 100.100.101.0 mask 255.255.255.0
neighbor 150.50.100.2 remote-as 65522
neighbor 150.50.100.2 send-community
neighbor 150.50.100.2 route-map NOEXPORT out
no auto-summary
!
access-list 1 permit 100.100.101.0 0.0.0.255
!
route-map NOEXPORT permit 10
match ip address 1
set community no-export
!
route-map NOEXPORT permit 20
r2
Network Next Hop Metric LocPrf Weight Path
*>i100.100.101.0/24 150.50.100.4 0 100 0 i
* 172.16.0.0/24 150.50.200.2 0 100 0 (65511) 500 i
* 172.16.1.0/24 150.50.200.2 0 100 0 (65511) 500 i
* 172.16.2.0/24 150.50.200.2 0 100 0 (65511) 500 i
* 172.16.3.0/24 150.50.200.2 0 100 0 (65511) 500 i
*> 192.168.0.0 150.50.20.1 0 100 0 (65511) i
*> 192.168.0.0/22 150.50.20.1 0 100 0 (65511) i
*> 192.168.1.0 150.50.20.1 0 100 0 (65511) i
*> 192.168.3.0 150.50.20.1 0 100 0 (65511) i
R2(config-router)#do sho ip route 100.100.100.0
% Subnet not in table
R2(config-router)#do sho ip route 100.100.101.0
Routing entry for 100.100.101.0/24
Known via "bgp 65522", distance 200, metric 0, type internal
Last update from 150.50.100.4 00:07:13 ago
Routing Descriptor Blocks:
* 150.50.100.4, from 150.50.100.4, 00:07:13 ago
Route metric is 0, traffic share count is 1
AS Hops 0
R2(config-router)#do sh ip bgp nei 150.50.100.4 routes
BGP table version is 21, local router ID is 150.50.2.2
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
*>i100.100.101.0/24 150.50.100.4 0 100 0 i
Total number of prefixes 1
*
As soon as I take the community off I see both 100.100.100.0 and
100.100.101.0*
R2#sho ip bgp
BGP table version is 23, local router ID is 150.50.2.2
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
*>i100.100.100.0/24 150.50.100.4 0 100 0 i
*>i100.100.101.0/24 150.50.100.4 0 100 0 i
* 172.16.0.0/24 150.50.200.2 0 100 0 (65511) 500 i
* 172.16.1.0/24 150.50.200.2 0 100 0 (65511) 500 i
* 172.16.2.0/24 150.50.200.2 0 100 0 (65511) 500 i
* 172.16.3.0/24 150.50.200.2 0 100 0 (65511) 500 i
*> 192.168.0.0 150.50.20.1 0 100 0 (65511) i
*> 192.168.0.0/22 150.50.20.1 0 100 0 (65511) i
*> 192.168.1.0 150.50.20.1 0 100 0 (65511) i
*> 192.168.3.0 150.50.20.1 0 100 0 (65511) i
