BGP No Advertise Community
Before
R3(config-router-bgp)#show ip bgp
BGP routing table information for VRF default
Router identifier 192.168.23.3, local AS number 23
Route status codes: * - valid, > - active, # - not installed, E - ECMP head, e - ECMP
S - Stale, c - Contributing to ECMP, b - backup, L - labeled-unicast
Origin codes: i - IGP, e - EGP, ? - incomplete
AS Path Attributes: Or-ID - Originator ID, C-LST - Cluster List, LL Nexthop - Link Local Nexthop
Network Next Hop Metric LocPref Weight Path
* > 1.1.1.1/32 192.168.23.2 0 100 0 1 i
R3(config-router-bgp)#
After
R3(config-router-bgp)#show ip bgp
BGP routing table information for VRF default
Router identifier 192.168.23.3, local AS number 23
Route status codes: * - valid, > - active, # - not installed, E - ECMP head, e - ECMP
S - Stale, c - Contributing to ECMP, b - backup, L - labeled-unicast
Origin codes: i - IGP, e - EGP, ? - incomplete
AS Path Attributes: Or-ID - Originator ID, C-LST - Cluster List, LL Nexthop - Link Local Nexthop
Network Next Hop Metric LocPref Weight Path
R3(config-router-bgp)#
R4(config-router-bgp)#show ip bgp
BGP routing table information for VRF default
Router identifier 192.168.24.4, local AS number 4
Route status codes: * - valid, > - active, # - not installed, E - ECMP head, e - ECMP
S - Stale, c - Contributing to ECMP, b - backup, L - labeled-unicast
Origin codes: i - IGP, e - EGP, ? - incomplete
AS Path Attributes: Or-ID - Originator ID, C-LST - Cluster List, LL Nexthop - Link Local Nexthop
Network Next Hop Metric LocPref Weight Path
Config R1
interface Ethernet1
no switchport
ip address 192.168.12.1/24
interface Loopback0
ip address 1.1.1.1/32
!
interface Management1
!
ip routing
!
route-map NO_ADVERTISE permit 10
set community no-advertise
!
router bgp 1
neighbor 192.168.12.2 remote-as 23
neighbor 192.168.12.2 route-map NO_ADVERTISE out
neighbor 192.168.12.2 send-community
network 1.1.1.1/32
R2
interface Ethernet1
no switchport
ip address 192.168.12.2/24
!
interface Ethernet2
no switchport
ip address 192.168.23.2/24
!
interface Ethernet3
no switchport
ip address 192.168.24.2/24
!
ip routing
!
router bgp 23
neighbor 192.168.12.1 remote-as 1
neighbor 192.168.23.3 remote-as 23
neighbor 192.168.23.3 next-hop-self
neighbor 192.168.24.4 remote-as 4
R3
interface Ethernet1
no switchport
ip address 192.168.23.3/24
!
ip routing
!
router bgp 23
neighbor 192.168.23.2 remote-as 23
R4
interface Ethernet1
no switchport
ip address 192.168.24.4/24
!
ip routing
!
router bgp 4
neighbor 192.168.24.2 remote-as 23