10-01-2013 01:34 AM - edited 03-04-2019 09:11 PM
Good day all,
I have a topology where im trying to configure a bgp with different AS number as per attached.
The problem now is, i can see the S_1 network in K_1 routing table, but i could not ping the S_1 router.
I've been checking in the past hour and could not find the issue.
Im thinking im missing somthing here.
Ignore S_2 and K_2 since i havent got S_1 and K_1 to work yet
Forgot to mention that this is testing using GNS3
K_1 routing table
K_1#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
10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
C 10.20.1.0/30 is directly connected, FastEthernet0/0
B 10.8.40.0/24 [20/0] via 10.20.1.1, 00:02:49
C 10.8.53.0/24 is directly connected, FastEthernet0/1
B 10.8.100.40/32 [20/0] via 10.20.1.1, 00:02:49
C 10.8.100.53/32 is directly connected, Loopback0
K_1#
S_1 Routing Table
S_1#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
10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
C 10.10.1.0/30 is directly connected, FastEthernet0/0
C 10.8.40.0/24 is directly connected, FastEthernet0/1
B 10.8.53.0/24 [20/0] via 10.10.1.1, 00:04:11
C 10.8.100.40/32 is directly connected, Loopback0
B 10.8.100.53/32 [20/0] via 10.10.1.1, 00:01:41
S_1#
S_1#ping 10.8.100.53 so lo0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.8.100.53, timeout is 2 seconds:
Packet sent with a source address of 10.8.100.40
...
Success rate is 0 percent (0/3)
S_1#ping 10.8.100.53
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.8.100.53, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
S_1#
Routing Table VRF TEST in PE_1
PE_1#sh ip route vrf TEST
Routing Table: TEST
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
10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
C 10.10.1.0/30 is directly connected, FastEthernet0/0
B 10.8.40.0/24 [20/0] via 10.10.1.2, 00:48:02
B 10.8.53.0/24 [200/0] via 10.2.2.1, 00:37:49
B 10.8.100.40/32 [20/0] via 10.10.1.2, 00:48:02
B 10.8.100.53/32 [200/0] via 10.2.2.1, 00:35:18
PE_1#
Routing Table VRF TEST in PE_2
PE_2#sh ip route VRF TEST
Routing Table: TEST
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
10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
C 10.20.1.0/30 is directly connected, FastEthernet0/0
B 10.8.40.0/24 [200/0] via 10.2.2.2, 00:48:47
B 10.8.53.0/24 [20/0] via 10.20.1.2, 00:38:49
B 10.8.100.40/32 [200/0] via 10.2.2.2, 00:48:47
B 10.8.100.53/32 [20/0] via 10.20.1.2, 00:36:14
PE_2#
Solved! Go to Solution.
10-01-2013 02:50 AM
Each PE router won't understand the MPLS VPNV4 labels coming in from the other.
Edit: In case that wasn't clear you need 'mpls ip' on your Serial interfaces
10-01-2013 02:01 AM
Hi,
when you ping 10.8.100.53 from S_1 the source IP will be 10.10.1.2(subnet 10.10.1.0/30) but K_1 hasn't got this subnet in its routing table so it can't reply.
Regards
Alain
Don't forget to rate helpful posts.
10-01-2013 02:10 AM
Hi Alain,
Thank you for the reply,
i did what you mention, using a source from LAN interface of S_1, i still could not get the reply from K_1
S_1#ping 10.8.100.53 so lo0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.8.100.53, timeout is 2 seconds:
Packet sent with a source address of 10.8.100.40
.....
Success rate is 0 percent (0/5)
S_1#ping 10.8.100.53 so fa0/1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.8.100.53, timeout is 2 seconds:
Packet sent with a source address of 10.8.40.2
.....
Success rate is 0 percent (0/5)
S_1#
10-01-2013 02:41 AM
Hi,
Can you enable the following debugs on both routers:
-debug ip icmp
-debug ip packet detail 100
-debug arp
before that configure ACL 100: access-list 100 permit icmp any any
and do this:
no service timestamp debug
Post the results.
Regards
Alain
Don't forget to rate helpful posts.
10-01-2013 02:50 AM
Each PE router won't understand the MPLS VPNV4 labels coming in from the other.
Edit: In case that wasn't clear you need 'mpls ip' on your Serial interfaces
10-01-2013 07:09 PM
Dear Jamie,
thats it. I've configured both serial interface with mpls ip and both K_1 ans S_1 now reachable. Thank you so much.
K_1#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 10.20.1.1 to network 0.0.0.0
10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
C 10.20.1.0/30 is directly connected, FastEthernet0/0
B 10.8.40.0/24 [20/0] via 10.20.1.1, 00:00:50
C 10.8.53.0/24 is directly connected, FastEthernet0/1
B 10.8.100.40/32 [20/0] via 10.20.1.1, 00:00:50
C 10.8.100.53/32 is directly connected, Loopback0
S* 0.0.0.0/0 [1/0] via 10.20.1.1
K_1#ping 10.8.100.40 so lo0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.8.100.40, timeout is 2 seconds:
Packet sent with a source address of 10.8.100.53
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/87/128 ms
K_1#
10-01-2013 05:05 AM
Hi,
there you need i-BGP reachability through IGP protocols or static routing between the same AS (K_1 and S_1)
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: