04-03-2008 05:56 AM - edited 03-05-2019 10:10 PM
Hi all,
I'm running EIGRP key-chains and authentication from one router to another and after configuring one side i get the expected routes start to flap. But also i can still ping from one end of the link to the other. Why is that if the authentication on both sides are different? If i can still ping what's the purpose of the authentication in the first place?
I'm basically trying to ask "what's the purpose of authentication?"
The key-chains and key-strings are the same across all routers, but i didn't authenticate (that word becomes a pain to keep typing out) across all the interfaces - just on router 1.
04-03-2008 06:08 AM
I think you are still able to ping because you still have some neighbors in use and the needed routes that are in your routing table may be from another neighbor advertising those routes. Do a traceroute and see if it takes the expected path.
Did you only set up authentication on 1 interface of router 1?
04-03-2008 07:32 AM
Hmmm, just checking.
Yes it's configure across all interfaces except for the loopback interface and i can still ping.
here's the output:
R1#sh ip eigrp inter detai
IP-EIGRP interfaces for process 20
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Se0/0 1 0/0 745 10/380 4088 0
Next xmit serial
Un/reliable mcasts: 0/0 Un/reliable ucasts: 6/4
Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0
Retransmissions sent: 0 Out-of-sequence rcvd: 0
Se0/1 1 0/0 20 10/380 380 0
Next xmit serial
Un/reliable mcasts: 0/0 Un/reliable ucasts: 3/3
Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0
Retransmissions sent: 1 Out-of-sequence rcvd: 0
Lo1 0 0/0 0 0/10 0 0
Next xmit serial
Un/reliable mcasts: 0/0 Un/reliable ucasts: 0/0
Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0
Retransmissions sent: 0 Out-of-sequence rcvd: 0
Fa0/0 2 0/0 444 0/10 2192 0
Next xmit serial
Un/reliable mcasts: 0/3 Un/reliable ucasts: 5/5
Mcast exceptions: 1 CR packets: 1 ACKs suppressed: 0
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Retransmissions sent: 2 Out-of-sequence rcvd: 0
Just trying to understand what's the point if i can still send information...
04-03-2008 07:35 AM
can you post output of
sh ip prot
sh ip eigrp neigh
sh run | be router eigrp
Also try clearing your eigrp neighbors and see if you can then re-establish a neighbor relationship
04-03-2008 07:57 AM
R1#sh run | be router eigrp
router eigrp 20
network 10.0.0.0
network 172.16.0.0
network 192.168.1.0
no auto-summary
no eigrp log-neighbor-changes
!
ip classless
no ip http server
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
transport input none
line aux 0
line vty 0 4
!
no scheduler allocate
end
R1#sh ip eigrp nei
IP-EIGRP neighbors for process 20
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
3 10.1.1.3 Fa0/0 11 00:30:05 12 200 0 17
2 172.16.12.2 Se0/1 11 00:33:18 20 2280 0 14
1 10.1.1.2 Fa0/0 11 00:33:21 877 5000 0 15
0 172.16.13.3 Se0/0 10 00:33:21 745 4470 0 15
R1#sh ip protoco
Routing Protocol is "eigrp 20"
Outgoing update filter list for all interfaces is
Incoming update filter list for all interfaces is
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: eigrp 20
Automatic network summarization is not in effect
Routing for Networks:
10.0.0.0
172.16.0.0
192.168.1.0
Routing Information Sources:
Gateway Distance Last Update
(this router) 5 00:33:45
10.1.1.2 90 00:30:23
10.1.1.3 90 00:30:23
172.16.12.2 90 00:30:23
172.16.13.3 90 00:30:23
Distance: internal 90 external 170
Also after clearing the neighbors an neighborship is re-established in less than 5 seconds. Good job this is just a lab....
04-03-2008 09:21 AM
Could you give me the output of the sho ip route and sh run?
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