09-16-2008 05:05 AM - edited 03-03-2019 11:33 PM
Hi All!
Basically, there are three routers with EIGRP enabled. Router A is a neighbor to Router B, Router B is a neighbor to Router C. Router A and Router C are not neighbors.
I have noticed, that Router B does not distribute networks learned from Router A to Router C. And vice versa.
What is the problem with configuration?
Thank you in advance
Solved! Go to Solution.
09-17-2008 11:12 AM
It looks to me like Paul is on the right track. Quoting from the original post by Fuad:
"Router A is a neighbor to Router B, Router B is a neighbor to Router C. Router A and Router C are not neighbors"
It appears that all three routers are in the same subnet. Normally each router would form a neighbor relationship with all other EIGRP routers in the subnet. It looks like the manual specification of neighbors is preventing the neighbor relationship between router A and router C. router B is not advertising router A routes to router C because it believes that router C should be learning them directly from router A.
HTH
Rick
09-16-2008 05:10 AM
The two pairs may be placed in different AS.
Redistribution between AS' is not automatic.
Please post the output of 'sh ip prot' from router B.
Posting the configs would be helpful too.
Regards,
Leo
09-16-2008 05:16 AM
Fuad
You ask "What is the problem with configuration?" but you do not give us the configuration to analyze. Leo has identified a possible problem. I would add that it might be a problem with auto summarization, or it might be an issue with distribute lists, or it might be something else. Without seeing the configs it is difficult for us to tell what the issue is.
While I agree with Leo that the output of show ip protocol might be helpful (especially if it is an issue with multiple EIGRP AS numbers) I believe that seeing the configs would be the most helpful thing.
HTH
Rick
09-16-2008 05:25 AM
Router B:
Routing Protocol is "eigrp 2007"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: connected, eigrp 2007
EIGRP NSF-aware route hold timer is 240s
EIGRP NSF disabled
NSF signal timer is 20s
NSF converge timer is 120s
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
10.254.252.0/27
192.168.0.0/23
192.168.2.0/23
192.168.15.0
192.168.16.0/23
192.168.18.0/23
192.168.55.0
192.168.100.0
192.168.101.0
192.168.106.0
192.168.139.0
192.168.213.0
192.168.254.0
Routing Information Sources:
Gateway Distance Last Update
192.168.254.2 90 1d03h
192.168.254.1 90 1d03h
192.168.254.10 90 6w3d
192.168.254.11 90 1d03h
192.168.254.48 90 1d11h
192.168.254.38 90 1d03h
192.168.254.46 90 1d03h
192.168.254.70 90 5w1d
Distance: internal 90 external 170
09-16-2008 05:25 AM
They are in the same AS
09-16-2008 05:29 AM
Network 192.168.11.0 is directly connected on Router C.
Network 192.168.22.0 is learned by Router A from another router.
Router B knows everything about both networks. However, router A knows nothing about 192.168.11.0 and router C knows nothing about 192.168.22.0
09-16-2008 05:37 AM
Fuad
The output of show ip protocol shows that there is only a single AS number. And it show that auto summarization is turned off - at least on router B. If auto summarization were on for routers A and C it could still be an isse with automatic summarization.
I believe that seeing the configs is even more important. I would also request the output of show ip eigrp topology from A or C (or both)
HTH
Rick
09-16-2008 08:08 PM
Here is iegrp config from Router C:
router eigrp 2007
redistribute connected
network 192.168.11.0
network 192.168.12.0
network 192.168.254.0
neighbor 192.168.254.1 Vlan1
neighbor 192.168.254.14 Vlan1
no auto-summary
eigrp stub connected summary
Show ip eigrp topology:
P 192.168.110.0/24, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 10.254.252.0/27, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
via 192.168.254.1 (3072/2816), Vlan1
P 192.168.102.4/30, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 11.11.11.0/24, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 192.168.100.0/24, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 192.168.101.0/24, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 10.31.0.0/24, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 192.168.44.0/24, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 192.168.55.0/24, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 192.168.11.0/24, 1 successors, FD is 2816
via Connected, Vlan40
P 192.168.12.0/24, 1 successors, FD is 2816
via Connected, Vlan41
P 192.168.15.0/24, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 192.168.0.0/23, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 192.168.2.0/23, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 192.168.16.0/23, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 192.168.18.0/23, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
P 192.168.254.0/24, 1 successors, FD is 2816
via Connected, Vlan1
P 192.168.200.0/24, 1 successors, FD is 3072
via 192.168.254.1 (3072/2816), Vlan1
P 192.168.213.0/24, 1 successors, FD is 3072
via 192.168.254.14 (3072/2816), Vlan1
09-16-2008 11:41 PM
neighbor 192.168.254.1 Vlan1
neighbor 192.168.254.14 Vlan1
Hello
its the EIGRP split horizon issue.
both the neighbors are on the same interface
HTH
jp
09-16-2008 11:56 PM
I am afraid I dont understand.
neighbor 192.168.254.14 Vlan1 is Router B
neighbor 192.168.254.1 has nothing to do with my problem, it is complitely another router.
Router C advertises its table to Router B (192.168.254.14). Router B does not advertise it further to Router A
09-16-2008 11:58 PM
Router A config:
router eigrp 2007
redistribute connected
redistribute static
redistribute bgp 65525 metric 10000000 200 255 1 1500 route-map BGP-EIGRP
network 192.168.254.0
neighbor 192.168.254.1 Vlan1
neighbor 192.168.254.38 Vlan1
neighbor 192.168.254.14 Vlan1
neighbor 192.168.254.11 Vlan1
neighbor 192.168.254.46 Vlan1
no auto-summary
09-17-2008 12:34 AM
ohh..i thought it was router B s config..
and the 192.168.254.1 and 192.168.254.14 are router A and C
could you please post the configs of router B
09-17-2008 01:20 AM
No, Router A is 192.168.254.1 and Router B is 192.168.254.14, router C is 192.168.254.70
I posted Router B config before, take a look please
09-17-2008 01:35 AM
hello
u had pasted sh ip protcols
could u give 'sh run | begin router eigrp'..?
if possible pls give the complete config..and one thing eigrp split horizon was a hint for u to look in to what could be your problem, this can be one reason for updates from C not getting passed to A and vice versa.
09-17-2008 01:38 AM
sh run | begin router eigrp
router eigrp 2007
redistribute connected
network 10.254.252.0 0.0.0.31
network 192.168.0.0 0.0.1.255
network 192.168.2.0 0.0.1.255
network 192.168.15.0
network 192.168.16.0 0.0.1.255
network 192.168.18.0 0.0.1.255
network 192.168.55.0
network 192.168.100.0
network 192.168.101.0
network 192.168.106.0
network 192.168.139.0
network 192.168.213.0
network 192.168.254.0
neighbor 192.168.254.48 Vlan1
neighbor 192.168.254.46 Vlan1
neighbor 192.168.254.70 Vlan1
neighbor 192.168.254.11 Vlan1
neighbor 192.168.254.38 Vlan1
neighbor 192.168.254.2 Vlan1
neighbor 192.168.254.1 Vlan1
neighbor 192.168.1.11 Vlan2
neighbor 192.168.1.254 Vlan2
no auto-summary
I have checked other neighbors and other routers which are being advertised on the same interface - everything works fine
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: