Solved: BGP not advertising

hfakoor222 · ‎06-05-2022

I believe it is a misconfiguration on core router which isnt advertising to B2, P2, A2 or receiving advertisement from A2.

Looking for hel;p.

C2    Router




*> 100.68.2.0/24 0.0.0.0 0 32768 i
C2#sh run
Building configuration...

Current configuration : 5078 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec localtime show-timezone year
service timestamps log datetime msec localtime show-timezone year
service password-encryption
!
hostname C2
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
aaa new-model
!
!
!
!
aaa session-id common
no ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ip domain name ws.nsrc.org
ipv6 unicast-routing
no ipv6 source-route
ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
ip tcp synwait-time 5
ip tcp path-mtu-discovery
!
!
!
!
interface Loopback0
description Loopback on Border
ip address 100.68.2.2 255.255.255.255
ipv6 address 2001:DB8:2::2/128
!
interface FastEthernet0/0
description BackBone link to Core
ip address 100.68.2.18 255.255.255.254
no ip redirects
no ip proxy-arp
ip router isis as20
duplex half
ipv6 address 2001:DB8:2:11::/127
ipv6 nd ra suppress
ipv6 router isis as20
isis network point-to-point
isis metric 2
isis ipv6 metric 2
!
interface FastEthernet1/0
description BackBone link to Core
ip address 100.68.2.20 255.255.255.254
no ip redirects
no ip proxy-arp
ip router isis as20
duplex auto
speed auto
ipv6 address 2001:DB8:2:12::/127
ipv6 nd ra suppress
ipv6 router isis as20
isis network point-to-point
isis metric 2
isis ipv6 metric 2
!
interface FastEthernet1/1
description BackBone link to Core
ip address 100.68.2.16 255.255.255.254
no ip redirects
no ip proxy-arp
ip router isis as20
duplex auto
speed auto
ipv6 address 2001:DB8:2:10::/127
ipv6 nd prefix default no-advertise
ipv6 nd ra suppress
ipv6 router isis as20
isis network point-to-point
isis metric 2
isis ipv6 metric 2
!
router isis as20
net 49.0001.0002.0002.00
is-type level-2-only
metric-style wide
set-overload-bit on-startup wait-for-bgp
log-adjacency-changes all
metric 100000
passive-interface Loopback0
!
address-family ipv6
multi-topology
set-overload-bit on-startup wait-for-bgp
metric 100000
exit-address-family
!
router bgp 20
no bgp default ipv4-unicast
bgp log-neighbor-changes
bgp deterministic-med
neighbor ibgp-full peer-group
neighbor ibgp-full remote-as 20
neighbor ibgp-full description FULL ROUTES
neighbor ibgp-full update-source Loopback0
neighbor ibgpv6-full peer-group
neighbor ibgpv6-full remote-as 20
neighbor ibgpv6-full description Full Routes
neighbor ibgpv6-full update-source Loopback0
neighbor ibgp-partial peer-group
neighbor ibgp-partial remote-as 20
neighbor ibgp-partial description Local Routes only
neighbor ibgp-partial update-source Loopback0
neighbor ibgpv6-partial peer-group
neighbor ibgpv6-partial remote-as 20
neighbor ibgpv6-partial description Local Routes only
neighbor ibgpv6-partial update-source Loopback0
neighbor 2001:DB8:2::1 peer-group ibgpv6-full
neighbor 2001:DB8:2::1 description iBGP with Border
neighbor 2001:DB8:2::3 peer-group ibgpv6-partial
neighbor 2001:DB8:2::3 description iBGP with Peering
neighbor 2001:DB8:2::4 peer-group ibgpv6-partial
neighbor 2001:DB8:2::4 description iBGP with Access
neighbor 100.68.2.1 peer-group ibgp-full
neighbor 100.68.2.1 description iBGP with Border
neighbor 100.68.2.3 peer-group ibgp-partial
neighbor 100.68.2.3 description iBGP with Peering
neighbor 100.68.2.4 peer-group ibgp-partial
neighbor 100.68.2.4 description iBGP with Access
!
address-family ipv4
neighbor ibgp-full send-community
neighbor ibgp-full route-reflector-client
neighbor ibgp-full next-hop-self
neighbor ibgp-partial send-community
neighbor ibgp-partial route-reflector-client
neighbor ibgp-partial next-hop-self
neighbor ibgp-partial filter-list 20 out
neighbor 100.68.2.1 activate
neighbor 100.68.2.3 activate
neighbor 100.68.2.4 activate
distance bgp 200 200 200
no auto-summary
no synchronization
network 100.68.2.0 mask 255.255.255.0
network 100.68.2.28 mask 255.255.255.252
exit-address-family
!
address-family ipv6
neighbor ibgpv6-full send-community
neighbor ibgpv6-full route-reflector-client
neighbor ibgpv6-full next-hop-self
neighbor ibgpv6-partial send-community
neighbor ibgpv6-partial route-reflector-client
neighbor ibgpv6-partial next-hop-self
neighbor ibgpv6-partial filter-list 10 out
neighbor 2001:DB8:2::1 activate
neighbor 2001:DB8:2::3 activate
neighbor 2001:DB8:2::4 activate
distance bgp 200 200 200
network 2001:DB8:2::/48
network 2001:DB8:2:21::/64
exit-address-family
!
ip forward-protocol nd
ip route 100.68.2.0 255.255.255.0 Null0
no ip http server
no ip http secure-server
!
ip as-path access-list 10 permit ^$
!
!
no cdp log mismatch duplex
ipv6 route 2001:DB8:2::/48 Null0
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
transport preferred none
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
transport preferred none
stopbits 1
line vty 0 4
transport preferred none
!
end













P2   Router










P2#sh run
Building configuration...

Current configuration : 3027 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec localtime show-timezone year
service timestamps log datetime msec localtime show-timezone year
service password-encryption
!
hostname P2
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
aaa new-model
!
!
!
!
aaa session-id common
no ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ip domain name ws.nsrc.org
ipv6 unicast-routing
no ipv6 source-route
ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
ip tcp synwait-time 5
ip tcp path-mtu-discovery
!
!
!
!
interface Loopback0
description Loopback On Said Router
ip address 100.68.2.3 255.255.255.255
ipv6 address 2001:DB8:2::3/128
!
interface FastEthernet0/0
description BackBone link to Core
ip address 100.68.2.19 255.255.255.254
no ip redirects
no ip proxy-arp
ip router isis as20
duplex half
ipv6 address 2001:DB8:2:11::1/127
ipv6 nd prefix default no-advertise
ipv6 nd ra suppress
ipv6 router isis as20
isis network point-to-point
isis metric 2
isis ipv6 metric 2
!
interface FastEthernet1/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet1/1
no ip address
shutdown
duplex auto
speed auto
!
router isis as20
net 49.0001.0002.0003.00
is-type level-2-only
metric-style wide
set-overload-bit on-startup wait-for-bgp
log-adjacency-changes all
metric 100000
!
address-family ipv6
multi-topology
set-overload-bit on-startup wait-for-bgp
metric 100000
exit-address-family
!
router bgp 20
no bgp default ipv4-unicast
bgp log-neighbor-changes
bgp deterministic-med
neighbor ibgp-rr peer-group
neighbor ibgp-rr remote-as 20
neighbor ibgp-rr description iBGP with RR
neighbor ibgp-rr update-source Loopback0
neighbor ibgpv6-rr peer-group
neighbor ibgpv6-rr remote-as 20
neighbor ibgpv6-rr description iBGP with RR
neighbor ibgpv6-rr update-source Loopback0
neighbor 2001:DB8:2::2 peer-group ibgpv6-rr
neighbor 2001:DB8:2::2 description iBGP with Core
neighbor 100.68.2.2 peer-group ibgp-rr
neighbor 100.68.2.2 description iBGP with Core
!
address-family ipv4
neighbor ibgp-rr send-community
neighbor ibgp-rr next-hop-self
neighbor 100.68.2.2 activate
distance bgp 200 200 200
no auto-summary
no synchronization
exit-address-family
!
address-family ipv6
neighbor ibgpv6-rr send-community
neighbor ibgpv6-rr next-hop-self
neighbor 2001:DB8:2::2 activate
distance bgp 200 200 200
exit-address-family
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Null0
no ip http server
no ip http secure-server
!
!
!
no cdp log mismatch duplex
ipv6 route ::/0 Null0
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
transport preferred none
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
transport preferred none
stopbits 1
line vty 0 4
transport preferred none
!
end










A2 Router




2#
A2#sh run
Building configuration...

Current configuration : 3327 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec localtime show-timezone year
service timestamps log datetime msec localtime show-timezone year
service password-encryption
!
hostname A2
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
aaa new-model
!
!
!
!
aaa session-id common
no ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ip domain name ws.nsrc.org
ipv6 unicast-routing
no ipv6 source-route
ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
ip tcp synwait-time 5
ip tcp path-mtu-discovery
!
!
!
!
interface Loopback0
description Loopback On Said Router
ip address 100.68.2.4 255.255.255.255
ipv6 address 2001:DB8:2::4/128
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface FastEthernet1/0
description BackBone link to Core
ip address 100.68.2.21 255.255.255.254
no ip redirects
no ip proxy-arp
ip router isis as20
duplex auto
speed auto
ipv6 address 2001:DB8:2:12::1/127
ipv6 nd prefix default no-advertise
ipv6 nd ra suppress
ipv6 router isis as20
isis network point-to-point
isis metric 2
isis ipv6 metric 2
!
interface FastEthernet1/1
description P2P Ethernet Link to Cust4
ip address 100.68.2.34 255.255.255.254
no ip redirects
no ip proxy-arp
duplex auto
speed auto
ipv6 address 2001:DB8:2:31::/127
ipv6 nd prefix default no-advertise
ipv6 nd ra suppress
!
router isis as20
net 49.0001.0002.0004.00
is-type level-2-only
metric-style wide
set-overload-bit on-startup wait-for-bgp
log-adjacency-changes all
metric 100000
!
address-family ipv6
multi-topology
set-overload-bit on-startup wait-for-bgp
metric 100000
exit-address-family
!
router bgp 20
no bgp default ipv4-unicast
bgp log-neighbor-changes
bgp deterministic-med
neighbor ibgp-rr peer-group
neighbor ibgp-rr remote-as 20
neighbor ibgp-rr description iBGP with RR
neighbor ibgp-rr update-source Loopback0
neighbor ibgpv6-rr peer-group
neighbor ibgpv6-rr remote-as 20
neighbor ibgpv6-rr description iBGP with RR
neighbor ibgpv6-rr update-source Loopback0
neighbor 2001:DB8:2::2 peer-group ibgpv6-rr
neighbor 2001:DB8:2::2 description iBGP with Core
neighbor 100.68.2.2 peer-group ibgp-rr
neighbor 100.68.2.2 description iBGP with Core
!
address-family ipv4
neighbor ibgp-rr send-community
neighbor ibgp-rr next-hop-self
neighbor 100.68.2.2 activate
distance bgp 200 200 200
no auto-summary
no synchronization
network 100.68.2.64 mask 255.255.255.192
exit-address-family
!
address-family ipv6
neighbor ibgpv6-rr send-community
neighbor ibgpv6-rr next-hop-self
neighbor 2001:DB8:2::2 activate
distance bgp 200 200 200
network 2001:DB8:2:4000::/52
exit-address-family
!
ip forward-protocol nd
ip route 100.68.2.64 255.255.255.192 100.68.2.35
no ip http server
no ip http secure-server
!
!
!
no cdp log mismatch duplex
ipv6 route 2001:DB8:2:4000::/52 2001:DB8:2:31::1
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
transport preferred none
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
transport preferred none
stopbits 1
line vty 0 4
transport preferred none
!
end



















B2   Router










hostname B2
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
aaa new-model
!
!
!
!
aaa session-id common
no ip source-route
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
ip domain name ws.nsrc.org
ipv6 unicast-routing
no ipv6 source-route
ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
!
!
ip tcp synwait-time 5
ip tcp path-mtu-discovery
!
!
!
!
interface Loopback0
description Loopback On Said Router
ip address 100.68.2.1 255.255.255.255
ipv6 address 2001:DB8:2::1/128
!
interface FastEthernet0/0
description P2P Ethernet Link to CX
ip address 100.68.2.19 255.255.255.254
no ip redirects
no ip proxy-arp
duplex half
ipv6 address 2001:DB8:2:11::1/127
ipv6 nd prefix default no-advertise
ipv6 nd ra suppress
!
interface FastEthernet1/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet1/1
description BackBone link to Core
ip address 100.68.2.17 255.255.255.254
no ip redirects
no ip proxy-arp
ip router isis as20
duplex auto
speed auto
ipv6 address 2001:DB8:2:10::1/127
ipv6 nd prefix default no-advertise
ipv6 nd ra suppress
ipv6 router isis as20
isis network point-to-point
isis metric 2
isis ipv6 metric 2
!
router isis as20
net 49.0001.0002.0001.00
is-type level-2-only
metric-style wide
set-overload-bit on-startup wait-for-bgp
log-adjacency-changes all
metric 100000
!
address-family ipv6
multi-topology
set-overload-bit on-startup wait-for-bgp
metric 100000
exit-address-family
!
router isis asX0
is-type level-1
metric-style wide
log-adjacency-changes all
metric 100000
!
address-family ipv6
multi-topology
metric 100000
exit-address-family
!
router bgp 20
no bgp default ipv4-unicast
bgp log-neighbor-changes
bgp deterministic-med
neighbor ibgp-rr peer-group
neighbor ibgp-rr remote-as 20
neighbor ibgp-rr description iBGP with RR
neighbor ibgp-rr update-source Loopback0
neighbor ibgpv6-rr peer-group
neighbor ibgpv6-rr remote-as 20
neighbor ibgpv6-rr description iBGP with RR
neighbor ibgpv6-rr update-source Loopback0
neighbor 2001:DB8:2::2 peer-group ibgpv6-rr
neighbor 2001:DB8:2::2 description iBGP with Core
neighbor 100.68.2.2 peer-group ibgp-rr
neighbor 100.68.2.2 description iBGP with Core
!
address-family ipv4
neighbor ibgp-rr send-community
neighbor ibgp-rr next-hop-self
neighbor 100.68.2.2 activate
distance bgp 200 200 200
no auto-summary
no synchronization
exit-address-family
!
address-family ipv6
neighbor ibgpv6-rr send-community
neighbor ibgpv6-rr next-hop-self
neighbor 2001:DB8:2::2 activate
distance bgp 200 200 200
exit-address-family
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
transport preferred none
stopbits 1
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
transport preferred none
stopbits 1
line vty 0 4
transport preferred none
!

Jon Marshall · ‎06-05-2022

You need to start using other commands other than just

sh ip bgp

eg.

sh ip bgp summary

will show you if you have peerings formed or not

sh ip bgp neighbors <IP of peer> advertised-routes

will show which networks are being advertised to which peers

You are peering on loopbacks but it looks like they are not being advertised in your IGP but this was the same issue as your previous post wasn't it ?

Jon

View solution in original post

Jon Marshall · ‎06-05-2022

You need to start using other commands other than just

sh ip bgp

eg.

sh ip bgp summary

will show you if you have peerings formed or not

sh ip bgp neighbors <IP of peer> advertised-routes

will show which networks are being advertised to which peers

You are peering on loopbacks but it looks like they are not being advertised in your IGP but this was the same issue as your previous post wasn't it ?

Jon

hfakoor222 · ‎06-05-2022

yes I see it now,

Thank you