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BGP Routes are in Routing table but still unable to ping all these routes

Jan 16, 2012 3:07 PM

Aman 93 posts since
Oct 21, 2011

Hi,

 

I had created a simple bgp lab by using GNS-3. Topology is in attachment,

As shown in topology i am using two AS (5500 & 6500).

 

In AS-5500 i have 4 routers & bgp is running in routers R1 & R4. ( OSPF is used as IGP).

 

As shown in routing table of R1, all bgp routes advertised by R5 are in the Routing table of R1.

 

R1#sh 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

 

 

     1.0.0.0/24 is subnetted, 1 subnets

C       1.1.1.0 is directly connected, Loopback0

     2.0.0.0/24 is subnetted, 1 subnets

O       2.2.2.0 [110/65] via 10.1.12.2, 00:01:55, Serial0/1

     3.0.0.0/24 is subnetted, 1 subnets

O       3.3.3.0 [110/65] via 10.1.13.3, 00:01:55, Serial0/0

     4.0.0.0/24 is subnetted, 1 subnets

O       4.4.4.0 [110/129] via 10.1.13.3, 00:01:55, Serial0/0

     10.0.0.0/24 is subnetted, 4 subnets

C       10.1.13.0 is directly connected, Serial0/0

C       10.1.12.0 is directly connected, Serial0/1

O       10.1.24.0 [110/192] via 10.1.13.3, 00:02:03, Serial0/0

O       10.1.34.0 [110/128] via 10.1.13.3, 00:02:03, Serial0/0

C    192.168.1.0/24 is directly connected, Loopback1

C    192.168.2.0/24 is directly connected, Loopback2

C    192.168.3.0/24 is directly connected, Loopback3

     60.0.0.0/24 is subnetted, 3 subnets

B       60.0.0.0 [200/0] via 4.4.4.4, 00:01:21

B       60.0.1.0 [200/0] via 4.4.4.4, 00:01:21

B       60.0.2.0 [200/0] via 4.4.4.4, 00:01:21

R1#

 

But still i'm unable to ping all the bgp advertised routes.

 

and even u can see the bgp table of  R1 ( all the routes are learned via. 4.4.4.4 which is the loopback add. of R4).

 

 

R1#sh ip bgp

BGP table version is 4, local router ID is 1.1.1.1

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

*>i60.0.0.0/24      4.4.4.4                  0    100      0 6500 i

*>i60.0.1.0/24      4.4.4.4                  0    100      0 6500 i

*>i60.0.2.0/24      4.4.4.4                  0    100      0 6500 i

R1#

 

and next hop is reacheble from R1 as follows:

 

R1#ping 4.4.4.4

 

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 36/158/292 ms

R1#

 

But when i trace the 60.0.1.1 n/w from R1. I found the following O/P. which clearly mentioned that there is some looping in my BGP process

 

R1#traceroute 60.0.1.1

 

 

Type escape sequence to abort.

Tracing the route to 60.0.1.1

 

 

  1 10.1.13.3 68 msec 92 msec 92 msec

  2 10.1.13.3 !H  *  !H

R1#

 

 

Kindly suggest..........

 

 

---------

Regards

Aman

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