Router reflector and iBGP routers are not able ping reflected eBGP routes.

abhisar patil · ‎06-20-2011

This is regarding the Route reflector.

Route reflector is reflecting routes to other iBGP peers but the reflected eBGP routes(eBGP router is connected to one of the iBGP router)

are not able to ping from route reflector and other iBGP routers.

What may the cause?

Abhisar.

SunilKhanna · ‎06-20-2011

do you see the routes in show ip route ??

Regards, Sunil Khanna

SunilKhanna · ‎06-20-2011

Refer to Troubleshooting BGP.

Cheers,

Sunil

Regards, Sunil Khanna

abhisar patil · ‎06-20-2011

Thanks Sunil for your reply,

I am able to see routes in show ip route and next hop is rechable too. But still cant ping the eBGP routes.

But at the same time, iBGP routes reflected by route reflectoor are able to ping.

Abhisar.

cadet alain · ‎06-20-2011

Hi,

Can you post a diagram with explanation of what is not working and then post sh ip route x.x.x.x on each router

where x.x.x.x is subnet from external AS.

Can you administrate the eBGP peer? if so can you do sh ip ro x.x.x.x where x.x.x.x is the src IP your are pinging from that is not working

Regards.

Alain.

Don't forget to rate helpful posts.

abhisar patil · ‎06-20-2011

Thanks Cadet for your reply,

Ya, I will paste network diagram and all outputs, give me some time as I dont have data with me now.

Abhisar.

milan.kulik · ‎06-20-2011

Hi,

are you sure the eBGP neighbours do have a correct routes to your reflector (and cascaded iBGP routers)?

If you try tracerouter to the eBGP routes from your reflector, what is the last hop replying?

HTH,

Milan

abhisar patil · ‎06-20-2011

Dear All,

Please find the network diagram and show run,show ip bgp outputs.

Configuration :

*************************************************

R1

interface FastEthernet0/0

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/0

ip address 10.12.1.1 255.255.255.252

clock rate 2000000

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/1

ip address 10.14.1.1 255.255.255.252

clock rate 2000000

!

interface Serial0/2

ip address 10.13.1.1 255.255.255.252

clock rate 2000000

!

interface Serial0/3

ip address 10.15.1.1 255.255.255.0

clock rate 2000000

!

router eigrp 1

network 10.0.0.0

no auto-summary

!

router bgp 6300

no synchronization

bgp log-neighbor-changes

neighbor 10.12.1.2 remote-as 6300

neighbor 10.12.1.2 route-reflector-client

neighbor 10.13.1.2 remote-as 6300

neighbor 10.13.1.2 route-reflector-client

neighbor 10.14.1.2 remote-as 6300

neighbor 10.14.1.2 route-reflector-client

neighbor 10.15.1.2 remote-as 5300

no auto-summary

*************************************************

R2

interface FastEthernet0/0

ip address 10.26.1.1 255.255.255.252

duplex auto

speed auto

!

interface Serial0/0

ip address 10.12.1.2 255.255.255.252

clock rate 2000000

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/1

no ip address

shutdown

clock rate 2000000

!

router eigrp 1

network 10.12.1.0 0.0.0.255

no auto-summary

!

router bgp 6300

no synchronization

bgp log-neighbor-changes

neighbor 10.12.1.1 remote-as 6300

neighbor 10.12.1.1 next-hop-self

neighbor 10.26.1.2 remote-as 4300

neighbor 10.26.1.2 ebgp-multihop 2

no auto-summary

*************************************************

R3

interface FastEthernet0/0

ip address 10.37.1.1 255.255.255.252

duplex auto

speed auto

!

interface Serial0/0

ip address 10.13.1.2 255.255.255.252

clock rate 2000000

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/1

no ip address

shutdown

clock rate 2000000

!

router eigrp 1

network 10.13.1.0 0.0.0.255

no auto-summary

!

router bgp 6300

no synchronization

bgp log-neighbor-changes

neighbor 10.13.1.1 remote-as 6300

neighbor 10.13.1.1 next-hop-self

neighbor 10.37.1.2 remote-as 2300

no auto-summary

!

*************************************************

R4

interface Loopback0

ip address 40.0.0.1 255.255.255.0

!

interface Loopback1

ip address 40.0.1.1 255.255.255.0

!

interface FastEthernet0/0

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/0

ip address 10.14.1.2 255.255.255.252

clock rate 2000000

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/1

no ip address

shutdown

clock rate 2000000

!

router eigrp 1

network 10.14.1.0 0.0.0.255

no auto-summary

!

router bgp 6300

no synchronization

bgp log-neighbor-changes

network 40.0.0.0 mask 255.255.255.0

network 40.0.1.0 mask 255.255.255.0

neighbor 10.14.1.1 remote-as 6300

no auto-summary

!

*************************************************

R5

interface FastEthernet0/0

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/0

ip address 10.15.1.2 255.255.255.0

clock rate 2000000

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/1

no ip address

shutdown

clock rate 2000000

!

router bgp 5300

no synchronization

bgp log-neighbor-changes

neighbor 10.15.1.1 remote-as 6300

no auto-summary

!

*************************************************

R6

interface Loopback0

ip address 10.26.4.1 255.255.255.0

!

interface Loopback1

ip address 10.26.8.1 255.255.255.0

!

interface Loopback2

ip address 10.26.12.1 255.255.255.0

!

interface Loopback3

ip address 10.26.16.1 255.255.255.0

!

interface FastEthernet0/0

ip address 10.26.1.2 255.255.255.252

duplex auto

speed auto

!

interface Serial0/0

no ip address

shutdown

clock rate 2000000

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0/1

no ip address

shutdown

clock rate 2000000

!

router bgp 4300

no synchronization

bgp log-neighbor-changes

network 10.26.4.0 mask 255.255.255.0

network 10.26.8.0 mask 255.255.255.0

network 10.26.12.0 mask 255.255.255.0

network 10.26.16.0 mask 255.255.255.0

neighbor 10.26.1.1 remote-as 6300

neighbor 10.26.1.1 ebgp-multihop 2

auto-summary

!

*************************************************

R7

interface Loopback0

ip address 10.37.4.1 255.255.255.0

!

interface Loopback1

ip address 10.37.8.1 255.255.255.0

!

interface Loopback2

ip address 10.37.12.1 255.255.255.0

!

interface Loopback3

ip address 10.37.16.1 255.255.255.0

!

interface FastEthernet0/0

ip address 10.37.1.2 255.255.255.252

duplex auto

speed auto

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

router bgp 2300

no synchronization

bgp log-neighbor-changes

network 10.37.4.0 mask 255.255.255.0

network 10.37.8.0 mask 255.255.255.0

network 10.37.12.0 mask 255.255.255.0

network 10.37.16.0 mask 255.255.255.0

neighbor 10.37.1.1 remote-as 6300

neighbor 10.37.1.1 ebgp-multihop 2

auto-summary

!

*************************************************

Show ip route : R1

Router#show ip route

Codes: 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

i - IS-IS, su - IS-IS summary, 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

40.0.0.0/24 is subnetted, 2 subnets

B 40.0.0.0 [200/0] via 10.14.1.2, 00:11:05

B 40.0.1.0 [200/0] via 10.14.1.2, 00:08:52

10.0.0.0/8 is variably subnetted, 12 subnets, 2 masks

B 10.26.16.0/24 [200/0] via 10.12.1.2, 00:23:11

C 10.15.1.0/24 is directly connected, Serial0/3

C 10.14.1.0/30 is directly connected, Serial0/1

C 10.13.1.0/30 is directly connected, Serial0/2

C 10.12.1.0/30 is directly connected, Serial0/0

B 10.26.4.0/24 [200/0] via 10.12.1.2, 00:23:11

B 10.26.8.0/24 [200/0] via 10.12.1.2, 00:23:11

B 10.26.12.0/24 [200/0] via 10.12.1.2, 00:23:11

B 10.37.12.0/24 [200/0] via 10.13.1.2, 00:22:54

B 10.37.8.0/24 [200/0] via 10.13.1.2, 00:22:55

B 10.37.4.0/24 [200/0] via 10.13.1.2, 00:22:55

B 10.37.16.0/24 [200/0] via 10.13.1.2, 00:22:55

*******************

show ip bgp : R1

Router#show ip bgp

BGP table version is 11, local router ID is 10.14.1.1

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

*>i10.26.4.0/24 10.12.1.2 0 100 0 4300 i

*>i10.26.8.0/24 10.12.1.2 0 100 0 4300 i

*>i10.26.12.0/24 10.12.1.2 0 100 0 4300 i

*>i10.26.16.0/24 10.12.1.2 0 100 0 4300 i

*>i10.37.4.0/24 10.13.1.2 0 100 0 2300 i

*>i10.37.8.0/24 10.13.1.2 0 100 0 2300 i

*>i10.37.12.0/24 10.13.1.2 0 100 0 2300 i

*>i10.37.16.0/24 10.13.1.2 0 100 0 2300 i

*>i40.0.0.0/24 10.14.1.2 0 100 0 i

*>i40.0.1.0/24 10.14.1.2 0 100 0 i

*************************************************

R2#show ip bgp

BGP table version is 11, local router ID is 10.26.1.1

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

*> 10.26.4.0/24 10.26.1.2 0 0 4300 i

*> 10.26.8.0/24 10.26.1.2 0 0 4300 i

*> 10.26.12.0/24 10.26.1.2 0 0 4300 i

*> 10.26.16.0/24 10.26.1.2 0 0 4300 i

*>i10.37.4.0/24 10.13.1.2 0 100 0 2300 i

*>i10.37.8.0/24 10.13.1.2 0 100 0 2300 i

*>i10.37.12.0/24 10.13.1.2 0 100 0 2300 i

*>i10.37.16.0/24 10.13.1.2 0 100 0 2300 i

*>i40.0.0.0/24 10.14.1.2 0 100 0 i

*>i40.0.1.0/24 10.14.1.2 0 100 0 i

*************************************************

R3#show ip bgp

BGP table version is 11, local router ID is 10.37.1.1

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

*>i10.26.4.0/24 10.12.1.2 0 100 0 4300 i

*>i10.26.8.0/24 10.12.1.2 0 100 0 4300 i

*>i10.26.12.0/24 10.12.1.2 0 100 0 4300 i

*>i10.26.16.0/24 10.12.1.2 0 100 0 4300 i

*> 10.37.4.0/24 10.37.1.2 0 0 2300 i

*> 10.37.8.0/24 10.37.1.2 0 0 2300 i

*> 10.37.12.0/24 10.37.1.2 0 0 2300 i

*> 10.37.16.0/24 10.37.1.2 0 0 2300 i

*>i40.0.0.0/24 10.14.1.2 0 100 0 i

*>i40.0.1.0/24 10.14.1.2 0 100 0 i

*************************************************

R4#show ip bgp

BGP table version is 11, local router ID is 10.14.1.2

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

*>i10.26.4.0/24 10.12.1.2 0 100 0 4300 i

*>i10.26.8.0/24 10.12.1.2 0 100 0 4300 i

*>i10.26.12.0/24 10.12.1.2 0 100 0 4300 i

*>i10.26.16.0/24 10.12.1.2 0 100 0 4300 i

*>i10.37.4.0/24 10.13.1.2 0 100 0 2300 i

*>i10.37.8.0/24 10.13.1.2 0 100 0 2300 i

*>i10.37.12.0/24 10.13.1.2 0 100 0 2300 i

*>i10.37.16.0/24 10.13.1.2 0 100 0 2300 i

*> 40.0.0.0/24 0.0.0.0 0 32768 i

*> 40.0.1.0/24 0.0.0.0 0 32768 i

*************************************************

Show ip route : R5

Router#show ip route

Codes: 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

i - IS-IS, su - IS-IS summary, 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

40.0.0.0/24 is subnetted, 2 subnets

B 40.0.0.0 [20/0] via 10.15.1.1, 00:11:58

B 40.0.1.0 [20/0] via 10.15.1.1, 00:09:44

10.0.0.0/24 is subnetted, 9 subnets

B 10.26.16.0 [20/0] via 10.15.1.1, 00:13:14

C 10.15.1.0 is directly connected, Serial0/0

B 10.26.4.0 [20/0] via 10.15.1.1, 00:13:14

B 10.26.8.0 [20/0] via 10.15.1.1, 00:13:14

B 10.26.12.0 [20/0] via 10.15.1.1, 00:13:14

B 10.37.12.0 [20/0] via 10.15.1.1, 00:13:14

B 10.37.8.0 [20/0] via 10.15.1.1, 00:13:14

B 10.37.4.0 [20/0] via 10.15.1.1, 00:13:14

B 10.37.16.0 [20/0] via 10.15.1.1, 00:13:14

**********************

show ip bgp : R5

Router#show ip bgp

BGP table version is 11, local router ID is 10.15.1.2

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

*> 10.26.4.0/24 10.15.1.1 0 6300 4300 i

*> 10.26.8.0/24 10.15.1.1 0 6300 4300 i

*> 10.26.12.0/24 10.15.1.1 0 6300 4300 i

*> 10.26.16.0/24 10.15.1.1 0 6300 4300 i

*> 10.37.4.0/24 10.15.1.1 0 6300 2300 i

*> 10.37.8.0/24 10.15.1.1 0 6300 2300 i

*> 10.37.12.0/24 10.15.1.1 0 6300 2300 i

*> 10.37.16.0/24 10.15.1.1 0 6300 2300 i

*> 40.0.0.0/24 10.15.1.1 0 6300 i

*> 40.0.1.0/24 10.15.1.1 0 6300 i

*************************************************

R6#show ip bgp

BGP table version is 11, local router ID is 10.26.16.1

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

*> 10.26.4.0/24 0.0.0.0 0 32768 i

*> 10.26.8.0/24 0.0.0.0 0 32768 i

*> 10.26.12.0/24 0.0.0.0 0 32768 i

*> 10.26.16.0/24 0.0.0.0 0 32768 i

*> 10.37.4.0/24 10.26.1.1 0 6300 2300 i

*> 10.37.8.0/24 10.26.1.1 0 6300 2300 i

*> 10.37.12.0/24 10.26.1.1 0 6300 2300 i

*> 10.37.16.0/24 10.26.1.1 0 6300 2300 i

*> 40.0.0.0/24 10.26.1.1 0 6300 i

*> 40.0.1.0/24 10.26.1.1 0 6300 i

*************************************************

R7#show ip bgp

BGP table version is 11, local router ID is 10.37.16.1

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

*> 10.26.4.0/24 10.37.1.1 0 6300 4300 i

*> 10.26.8.0/24 10.37.1.1 0 6300 4300 i

*> 10.26.12.0/24 10.37.1.1 0 6300 4300 i

*> 10.26.16.0/24 10.37.1.1 0 6300 4300 i

*> 10.37.4.0/24 0.0.0.0 0 32768 i

*> 10.37.8.0/24 0.0.0.0 0 32768 i

*> 10.37.12.0/24 0.0.0.0 0 32768 i

*> 10.37.16.0/24 0.0.0.0 0 32768 i

*> 40.0.0.0/24 10.37.1.1 0 6300 i

*> 40.0.1.0/24 10.37.1.1 0 6300 i

*************************************************

Output :

R1#ping 10.26.12.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.26.12.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

**************

R1#traceroute 10.26.12.1

Type escape sequence to abort.

Tracing the route to 10.26.12.1

1 10.12.1.2 20 msec 52 msec 12 msec

2 * * *

3 * * *

4 * * *

**************

R5#ping 10.26.8.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.26.8.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R5#ping 40.0.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 40.0.1.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 8/32/68 ms

**************

R7#ping 40.0.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 40.0.1.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

**************

Abhisar.

cadet alain · ‎06-20-2011

Hi,

Can you post sh ip route on each router and traceroute R6 loopbacks as well as R7 loopbacks from R1

Regards.

Alain.

Don't forget to rate helpful posts.

abhisar patil · ‎06-20-2011

Hi Cadet,

Here is show ip route..

R1#show ip route

Codes: 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

i - IS-IS, su - IS-IS summary, 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

40.0.0.0/24 is subnetted, 2 subnets

B 40.0.0.0 [200/0] via 10.14.1.2, 00:04:35

B 40.0.1.0 [200/0] via 10.14.1.2, 00:04:35

10.0.0.0/8 is variably subnetted, 12 subnets, 2 masks

B 10.26.16.0/24 [200/0] via 10.12.1.2, 00:04:17

C 10.15.1.0/24 is directly connected, Serial0/3

C 10.14.1.0/30 is directly connected, Serial0/1

C 10.13.1.0/30 is directly connected, Serial0/2

C 10.12.1.0/30 is directly connected, Serial0/0

B 10.26.4.0/24 [200/0] via 10.12.1.2, 00:04:17

B 10.26.8.0/24 [200/0] via 10.12.1.2, 00:04:17

B 10.26.12.0/24 [200/0] via 10.12.1.2, 00:04:17

B 10.37.12.0/24 [200/0] via 10.13.1.2, 00:00:44

B 10.37.8.0/24 [200/0] via 10.13.1.2, 00:00:44

B 10.37.4.0/24 [200/0] via 10.13.1.2, 00:00:44

B 10.37.16.0/24 [200/0] via 10.13.1.2, 00:00:44

*********************************************************

R2#show ip route

Codes: 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

i - IS-IS, su - IS-IS summary, 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

40.0.0.0/24 is subnetted, 2 subnets

B 40.0.0.0 [200/0] via 10.14.1.2, 00:04:34

B 40.0.1.0 [200/0] via 10.14.1.2, 00:04:34

10.0.0.0/8 is variably subnetted, 13 subnets, 2 masks

B 10.26.16.0/24 [20/0] via 10.26.1.2, 00:06:12

D 10.15.1.0/24 [90/2681856] via 10.12.1.1, 00:03:32, Serial0/0

D 10.14.1.0/30 [90/2681856] via 10.12.1.1, 00:03:32, Serial0/0

D 10.13.1.0/30 [90/2681856] via 10.12.1.1, 00:03:32, Serial0/0

C 10.12.1.0/30 is directly connected, Serial0/0

C 10.26.1.0/30 is directly connected, FastEthernet0/0

B 10.26.4.0/24 [20/0] via 10.26.1.2, 00:06:12

B 10.26.8.0/24 [20/0] via 10.26.1.2, 00:06:12

B 10.26.12.0/24 [20/0] via 10.26.1.2, 00:06:12

B 10.37.12.0/24 [200/0] via 10.13.1.2, 00:01:18

B 10.37.8.0/24 [200/0] via 10.13.1.2, 00:01:18

B 10.37.4.0/24 [200/0] via 10.13.1.2, 00:01:18

B 10.37.16.0/24 [200/0] via 10.13.1.2, 00:01:18

*********************************************************

R3#show ip route

Codes: 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

i - IS-IS, su - IS-IS summary, 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

40.0.0.0/24 is subnetted, 2 subnets

B 40.0.0.0 [200/0] via 10.14.1.2, 00:04:56

B 40.0.1.0 [200/0] via 10.14.1.2, 00:04:56

10.0.0.0/8 is variably subnetted, 13 subnets, 2 masks

B 10.26.16.0/24 [200/0] via 10.12.1.2, 00:04:56

D 10.15.1.0/24 [90/2681856] via 10.13.1.1, 00:05:02, Serial0/0

D 10.14.1.0/30 [90/2681856] via 10.13.1.1, 00:05:02, Serial0/0

C 10.13.1.0/30 is directly connected, Serial0/0

D 10.12.1.0/30 [90/2681856] via 10.13.1.1, 00:05:02, Serial0/0

B 10.26.4.0/24 [200/0] via 10.12.1.2, 00:04:56

B 10.26.8.0/24 [200/0] via 10.12.1.2, 00:04:56

B 10.26.12.0/24 [200/0] via 10.12.1.2, 00:04:56

B 10.37.12.0/24 [20/0] via 10.37.1.2, 00:01:46

B 10.37.8.0/24 [20/0] via 10.37.1.2, 00:01:46

B 10.37.4.0/24 [20/0] via 10.37.1.2, 00:01:46

C 10.37.1.0/30 is directly connected, FastEthernet0/0

B 10.37.16.0/24 [20/0] via 10.37.1.2, 00:01:46

*********************************************************

R4#show ip route

Codes: 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

i - IS-IS, su - IS-IS summary, 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

40.0.0.0/24 is subnetted, 2 subnets

C 40.0.0.0 is directly connected, Loopback0

C 40.0.1.0 is directly connected, Loopback1

10.0.0.0/8 is variably subnetted, 12 subnets, 2 masks

B 10.26.16.0/24 [200/0] via 10.12.1.2, 00:06:01

D 10.15.1.0/24 [90/2681856] via 10.14.1.1, 00:05:24, Serial0/0

C 10.14.1.0/30 is directly connected, Serial0/0

D 10.13.1.0/30 [90/2681856] via 10.14.1.1, 00:05:24, Serial0/0

D 10.12.1.0/30 [90/2681856] via 10.14.1.1, 00:05:24, Serial0/0

B 10.26.4.0/24 [200/0] via 10.12.1.2, 00:06:02

B 10.26.8.0/24 [200/0] via 10.12.1.2, 00:06:02

B 10.26.12.0/24 [200/0] via 10.12.1.2, 00:06:02

B 10.37.12.0/24 [200/0] via 10.13.1.2, 00:02:17

B 10.37.8.0/24 [200/0] via 10.13.1.2, 00:02:17

B 10.37.4.0/24 [200/0] via 10.13.1.2, 00:02:17

B 10.37.16.0/24 [200/0] via 10.13.1.2, 00:02:17

*********************************************************

R5#show ip route

Codes: 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

i - IS-IS, su - IS-IS summary, 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

40.0.0.0/24 is subnetted, 2 subnets

B 40.0.0.0 [20/0] via 10.15.1.1, 00:05:36

B 40.0.1.0 [20/0] via 10.15.1.1, 00:05:36

10.0.0.0/24 is subnetted, 9 subnets

B 10.26.16.0 [20/0] via 10.15.1.1, 00:05:36

C 10.15.1.0 is directly connected, Serial0/0

B 10.26.4.0 [20/0] via 10.15.1.1, 00:05:36

B 10.26.8.0 [20/0] via 10.15.1.1, 00:05:36

B 10.26.12.0 [20/0] via 10.15.1.1, 00:05:36

B 10.37.12.0 [20/0] via 10.15.1.1, 00:02:44

B 10.37.8.0 [20/0] via 10.15.1.1, 00:02:44

B 10.37.4.0 [20/0] via 10.15.1.1, 00:02:44

B 10.37.16.0 [20/0] via 10.15.1.1, 00:02:44

*********************************************************

R6#show ip route

Codes: 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

i - IS-IS, su - IS-IS summary, 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

40.0.0.0/24 is subnetted, 2 subnets

B 40.0.0.0 [20/0] via 10.26.1.1, 00:06:51

B 40.0.1.0 [20/0] via 10.26.1.1, 00:06:51

10.0.0.0/8 is variably subnetted, 9 subnets, 2 masks

C 10.26.16.0/24 is directly connected, Loopback3

C 10.26.1.0/30 is directly connected, FastEthernet0/0

C 10.26.4.0/24 is directly connected, Loopback0

C 10.26.8.0/24 is directly connected, Loopback1

C 10.26.12.0/24 is directly connected, Loopback2

B 10.37.12.0/24 [20/0] via 10.26.1.1, 00:03:49

B 10.37.8.0/24 [20/0] via 10.26.1.1, 00:03:49

B 10.37.4.0/24 [20/0] via 10.26.1.1, 00:03:49

B 10.37.16.0/24 [20/0] via 10.26.1.1, 00:03:49

*********************************************************

R7#show ip route

Codes: 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

i - IS-IS, su - IS-IS summary, 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

40.0.0.0/24 is subnetted, 2 subnets

B 40.0.0.0 [20/0] via 10.37.1.1, 00:04:26

B 40.0.1.0 [20/0] via 10.37.1.1, 00:04:26

10.0.0.0/8 is variably subnetted, 9 subnets, 2 masks

B 10.26.16.0/24 [20/0] via 10.37.1.1, 00:04:26

B 10.26.4.0/24 [20/0] via 10.37.1.1, 00:04:26

B 10.26.8.0/24 [20/0] via 10.37.1.1, 00:04:26

B 10.26.12.0/24 [20/0] via 10.37.1.1, 00:04:26

C 10.37.12.0/24 is directly connected, Loopback2

C 10.37.8.0/24 is directly connected, Loopback1

C 10.37.4.0/24 is directly connected, Loopback0

C 10.37.1.0/30 is directly connected, FastEthernet0/0

C 10.37.16.0/24 is directly connected, Loopback3

*********************************************************

R1#traceroute 10.26.12.1

Type escape sequence to abort.

Tracing the route to 10.26.12.1

1 10.12.1.2 20 msec 52 msec 12 msec

2 * * *

3 * * *

4 * * *

R1#traceroute 10.37.4.1

Type escape sequence to abort.

Tracing the route to 10.37.4.1

1 10.13.1.2 60 msec 28 msec 28 msec

2 * * *

3 * * *

4 * * *

Here,

I am able to ping 40.0.1.1(R4 loopback network) from R5,but not from R6 and R7 also not able to ping R6 or R7 loopback network from R1,R4,R5.

Abhisar.

milan.kulik · ‎06-21-2011

Hi,

IMHO, your problem is following:

When Pinging from your R1,R2, R3,R3 routers to the eBGP neighbours, the Ping packet is using the interface 10.12.1.x, 10.13.1.x, 10.14.1.x source IP address.

But the eBGP neighbor routers don't have those subnets in their routing tables as you are not advertising them via BGP!

The same way R4 does not know the route back to 10.26.1.0/30 whe you are Pinging to 40.0.1.1 from R6.

The easiest way might be adding "redistribute connected" command in your BGP configuration on all routers.

Or add proper "network ..." commands on your routers.

HTH,

Milan

abhisar patil · ‎06-21-2011

Hi Milan,

Ya, I am agree with you but here see I am able to ping 40.0.1.0 network form R5 and R5 does not have 10.14.1.0 network in its routing table.

Also,1 more thing..

Now, consider AS 6300 is one ISP say ISP1 and AS 4300 is ISP2. So to ping ISP2's network(loopbaks) from ISP1, do we have to broadcast link between ISP1 and ISP2(Poing to Point network here 10.26.1.0 through EIGRP or BGP)...?

Ans if yes, then in gereral we cant use the private IPs to built ISPs network(ISPs own internal network ), we have to use public IPs only..Correct..?

Abhisar.

cadet alain · ‎06-21-2011

Hi,

When you ping 10.26.12.1 on R6 from R1 the output interface is s0/0( 10.12.1.0 network) but R6 doesn't know about this subnet and so can't reply.

The same goes for R7 when you ping 10.37.4.1 the output interface is s0/2(10.13.1.0 network) but R7 doesn't know about this subnet and so can't reply.

Advertise 10.12.1.0/30 in BGP on R2 and 10.13.1.0/30 on R3 and it should work.

When you ping 40.0.1.1 from R5 the output interface is s0/0( network 10.15.1.0) and R4 can reply because it knows about this subnet from EIGRP.

From R6 and R7 it doesn't work because R4 doesn't know 10.26.1.0 nor 10.37.1.0 networks and so can't reply.

On all the routers in your route-reflector cluster enable EIGRP for 10.0.0.0 and it should work.

Regards.

Alain.

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abhisar patil · ‎06-21-2011

Thanks Alian,

So to solve the issue, I need to advertise 10.0.0.0 network through EIGRP in AS 6300..with 10.12.1.0/30 in BGP on R2 and 10.13.1.0/30 on R3 , because of this R6 and R7 will come to know 10.12.0 and 10.13.1.0 and 10.14.1.0..right..?

And it means we are advertising AS 6300's internal network(P2P links) to other AS 4300,2300.

But now my question is,

Consider AS 6300 is one ISP say ISP1 and AS 4300 is ISP2. So to ping ISP2's network(loopbaks) from ISP1, do we have to broadcast link between ISP1 and ISP2(Poing to Point network here 10.26.1.0 through EIGRP or BGP)...?

Ans if yes, then in gereral we cant use the private IPs to built ISPs network(ISPs own internal network ), we have to use public IPs only..Correct..?

Here, I am little confusing, so please guide.

Thanking you.

Abhisar.

cadet alain · ‎06-21-2011

So to solve the issue, I need to advertise

10.0.0.0

network through EIGRP in AS 6300..with

10.12.1.0/30 in BGP on R2 and 10.13.1.0/30 on R3

, because of this R6 and R7 will come to know 10.12.0 and 10.13.1.0 and 10.14.1.0..right..?

For 10.14.1.0 you must also advertise into BGP if you want R6 and R7 to know about it

Consider AS 6300 is one ISP say ISP1 and AS 4300 is ISP2. So to ping ISP2's network(loopbaks) from ISP1, do we have to broadcast link between ISP1 and ISP2(Poing to Point network here 10.26.1.0 through EIGRP or BGP)...?

I don't understand can you clarify please.

Ans  if yes, then in gereral we cant use the private IPs to built ISPs   network(ISPs own internal network ), we have to use public IPs   only..Correct..?

ISP are transit ASes and they enable prefixes from one AS to be advertised to another AS and in real life of course these prefixes are public IPs.

Inside your AS you can use private IPs as long as they are not advertised outside your AS.

Regards.

Alain.

Don't forget to rate helpful posts.