el 08-26-2023 10:31 AM
Hi Everyone,
I have this topology, I'm not sure why R3 can not ping 10.1.1.1, Attached as much configuration that I deems is necesary. Please If you needs any other aditional information let me know.
R3
R3#show 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
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, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 11 subnets, 3 masks
B 10.1.1.0/24 [200/0] via 10.23.1.1, 00:01:35
B 10.7.7.0/24 [200/0] via 10.67.1.2, 00:14:13
O 10.7.7.1/32 [110/193] via 10.34.1.2, 01:20:11, Serial1/2
C 10.23.1.0/30 is directly connected, Serial1/1
L 10.23.1.2/32 is directly connected, Serial1/1
O 10.25.1.0/30 [110/128] via 10.23.1.1, 00:13:21, Serial1/1
C 10.34.1.0/30 is directly connected, Serial1/2
L 10.34.1.1/32 is directly connected, Serial1/2
O 10.46.1.0/30 [110/128] via 10.34.1.2, 01:21:56, Serial1/2
O 10.56.1.0/30 [110/192] via 10.34.1.2, 01:21:36, Serial1/2
[110/192] via 10.23.1.1, 00:13:21, Serial1/1
O 10.67.1.0/30 [110/192] via 10.34.1.2, 01:21:36, Serial1/2
R3#show bgp ipv4 unicast
BGP table version is 7, local router ID is 10.34.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*>i 10.1.1.0/24 10.23.1.1 0 100 0 100 i
*>i 10.7.7.0/24 10.67.1.2 0 100 0 (65200) 300 i
R3#show running-config | sec bgp
router bgp 65100
bgp log-neighbor-changes
bgp confederation identifier 200
neighbor 10.23.1.1 remote-as 65100
neighbor 10.23.1.1 route-reflector-client
neighbor 10.34.1.2 remote-as 65100
neighbor 10.34.1.2 route-reflector-client
-------------------------------------------------------------------------------------------
R2
R2#show running-config | sec bgp
router bgp 65100
bgp log-neighbor-changes
bgp confederation identifier 200
bgp confederation peers 65200
neighbor 10.12.1.1 remote-as 100
neighbor 10.23.1.2 remote-as 65100
neighbor 10.23.1.2 next-hop-self
neighbor 10.25.1.2 remote-as 65200
neighbor 10.25.1.2 next-hop-self
R2#show runn
R2#show running-config | sec bgp
router bgp 65100
bgp log-neighbor-changes
bgp confederation identifier 200
bgp confederation peers 65200
neighbor 10.12.1.1 remote-as 100
neighbor 10.23.1.2 remote-as 65100
neighbor 10.23.1.2 next-hop-self
neighbor 10.25.1.2 remote-as 65200
neighbor 10.25.1.2 next-hop-self
R2#
R2#
R2#
R2#
R2#
R2#sho
R2#show 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
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, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 13 subnets, 3 masks
B 10.1.1.0/24 [20/0] via 10.12.1.1, 00:10:21
B 10.7.7.0/24 [200/0] via 10.67.1.2, 00:10:23
O 10.7.7.1/32 [110/193] via 10.25.1.2, 00:22:07, Serial1/2
C 10.12.1.0/30 is directly connected, Serial1/0
L 10.12.1.2/32 is directly connected, Serial1/0
C 10.23.1.0/30 is directly connected, Serial1/1
L 10.23.1.1/32 is directly connected, Serial1/1
C 10.25.1.0/30 is directly connected, Serial1/2
L 10.25.1.1/32 is directly connected, Serial1/2
O 10.34.1.0/30 [110/128] via 10.23.1.2, 00:22:24, Serial1/1
O 10.46.1.0/30 [110/192] via 10.25.1.2, 00:22:07, Serial1/2
[110/192] via 10.23.1.2, 00:22:24, Serial1/1
O 10.56.1.0/30 [110/128] via 10.25.1.2, 00:22:07, Serial1/2
O 10.67.1.0/30 [110/192] via 10.25.1.2, 00:22:07, Serial1/2
R2#
R2#
R2#sho
R2#show bgp ipv4 uni
BGP table version is 3, local router ID is 10.25.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 10.1.1.0/24 10.12.1.1 0 0 100 i
* 10.7.7.0/24 10.67.1.2 0 100 0 (65200) 300 i
*>i 10.67.1.2 0 100 0 (65200) 300 i
el 08-26-2023 11:32 AM
Hello @davidcriollo,
Does R1 know the route towards 10.34.1.0/30 ?
el 08-26-2023 02:52 PM
R2 can ping 10.1.1.1?
Does not forget that R1 and R2 are forming eBGP and you are trying to ping a loopback. Make sure you dont need the ebgp-multihop
el 08-28-2023 03:00 AM
Yes, R1 did not know a router for any ip address in AS200 or AS300, I configure a default route and it went through. however, is that a good practice? or which will be the best option so r1 can learn router from AS200 or AS300?
el 08-28-2023 04:06 AM
The problem rely on the fact that you are using eBGP and trying to reach loopback. There is nothing wrong with that and that is nothing wrong to use static/deffault route. It is just a matter of what you want to accomplish and how.
If static route fix your problem, then that´s fine.
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