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BGP route issue

TusharMore05872
Level 1
Level 1

i am  not getting  ping from PC (172.100.50.51 ) to PC ( 172.100.20.21).....

MY network diagram attached below ..

router 1 configuration:-

Building configuration...

 

Current configuration : 889 bytes

!

version 15.1

no service timestamps log datetime msec

no service timestamps debug datetime msec

no service password-encryption

!

hostname Router

!

ip cef

no ipv6 cef

!

license udi pid CISCO1941/K9 sn FTX15246TGH

!

spanning-tree mode pvst

!

interface GigabitEthernet0/0

ip address 192.100.100.11 255.255.255.0

duplex auto

speed auto

!

interface GigabitEthernet0/1

ip address 172.100.20.1 255.255.255.0

duplex auto

speed auto

!

interface Vlan1

no ip address

shutdown

!

router eigrp 1

distance eigrp 10 15

network 172.100.20.0 0.0.0.255

network 192.168.10.0

no auto-summary

!

router bgp 65002

bgp log-neighbor-changes

no synchronization

neighbor 192.100.100.12 remote-as 1010

network 172.100.20.0 mask 255.255.255.0

!

ip classless

!

ip flow-export version 9

!

!

 

line con 0

!

line aux 0

!

line vty 0 4

login

!

end

Router#

Router#sh ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

P - periodic downloaded static route

Gateway of last resort is not set

172.100.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 172.100.20.0/24 is directly connected, GigabitEthernet0/1

L 172.100.20.1/32 is directly connected, GigabitEthernet0/1

192.100.100.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.100.100.0/24 is directly connected, GigabitEthernet0/0

L 192.100.100.11/32 is directly connected, GigabitEthernet0/0

B 192.168.10.0/24 [20/0] via 192.100.100.12, 03:33:41

Router#

 

Router 2 configuration :- 

 

Building configuration...

 

Current configuration : 1024 bytes

!

version 15.1

no service timestamps log datetime msec

no service timestamps debug datetime msec

no service password-encryption

!

hostname Router

!

ip dhcp excluded-address 172.100.50.0 172.100.50.50

!

ip dhcp pool Tushar

network 172.100.50.0 255.255.255.0

default-router 172.100.50.1

!

ip cef

no ipv6 cef

!

license udi pid CISCO1941/K9 sn FTX1524LSP4

!

spanning-tree mode pvst

!

interface Loopback0

ip address 10.10.10.10 255.255.255.0

!

interface GigabitEthernet0/0

ip address 172.100.50.1 255.255.255.0

duplex auto

speed auto

!

interface GigabitEthernet0/1

ip address 192.168.10.10 255.255.255.0

duplex auto

speed auto

!

interface Vlan1

no ip address

shutdown

!

router bgp 65002

bgp log-neighbor-changes

neighbor 192.168.10.11 remote-as 1010

network 172.100.50.0 mask 255.255.255.0

network 10.10.10.0 mask 255.255.255.0

!

ip classless

!

ip flow-export version 9

!

ip access-list standard PERMIT

!

line con 0

!

line aux 0

!

line vty 0 4

login

!

end

Router#sh ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.10.10.0/24 is directly connected, Loopback0

L 10.10.10.10/32 is directly connected, Loopback0

172.100.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 172.100.50.0/24 is directly connected, GigabitEthernet0/0

L 172.100.50.1/32 is directly connected, GigabitEthernet0/0

B 192.100.100.0/24 [20/0] via 192.168.10.11, 03:36:07

192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.10.0/24 is directly connected, GigabitEthernet0/1

L 192.168.10.10/32 is directly connected, GigabitEthernet0/1

 

 

Router 6 (Airtel ) configuration :- 

Current configuration : 728 bytes

!

version 12.4

no service timestamps log datetime msec

no service timestamps debug datetime msec

no service password-encryption

!

hostname Router

!

ip cef

no ipv6 cef

!

spanning-tree mode pvst

!

interface FastEthernet0/0

ip address 192.168.10.11 255.255.255.0

duplex auto

speed auto

!

interface FastEthernet0/1

ip address 192.100.100.12 255.255.255.0

duplex auto

speed auto

!

interface Vlan1

no ip address

shutdown

!

router bgp 1010

bgp log-neighbor-changes

neighbor 192.168.10.10 remote-as 65002

neighbor 192.100.100.11 remote-as 65002

redistribute connected

!

ip classless

!

ip flow-export version 9

!

line con 0

!

line aux 0

!

line vty 0 4

login

!

end

Router#sh ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 1 subnets

B 10.10.10.0 [20/0] via 192.168.10.10, 03:38:13

172.100.0.0/24 is subnetted, 2 subnets

B 172.100.20.0 [20/0] via 192.100.100.11, 03:38:13

B 172.100.50.0 [20/0] via 192.168.10.10, 03:38:13

C 192.100.100.0/24 is directly connected, FastEthernet0/1

C 192.168.10.0/24 is directly connected, FastEthernet0/0

 

 

 

(Not getting route of router 2 on  router 1 and viceversa)

2 Replies 2

Hello,

 

your Airtel router is connected to two routers in the same AS ? That won't work, as routes that contain it's own AS are dropped. You need to change one of the AS numbers to something else (e.g. 65003) and also change the configurations accordingly.

 

router bgp 1010

bgp log-neighbor-changes

neighbor 192.168.10.10 remote-as 65002

neighbor 192.100.100.11 remote-as 65002

redistribute connected

Hello

Due to bgp loop avoidance the two rtrs runing in the same ASN wont accept prefixes that contain thier own ASN in the sequence number of the as-path, you can negate this loop avoidance if you desire with the following:

both rtrs in ASN 65002:

router bgp 65002
neighbor x.x.x. allowas-in 1010


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Kind Regards
Paul
Review Cisco Networking for a $25 gift card