[c-nsp] problem with EIGRP

[Nikolay Abromov]

Thanks for fast answer guys.


>Dave
>http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800
94690.shtml


Rick 
>It may be this: CSCsa43492, an input queue wedge on the T0 of the
>other router. The sending router would have a queue count > 0, and the
>receiving router's input T0 interface would have an input queue size >
max
>size.
>	It's fixed in 12.3.13.
>	Or, it could be an MTU issue on the T0 interface. Try the ip mtu
>1400 on both ends of the T0 interface. The EIGRP queue count should
>decrement quickly after configuration.
>Thanks,
>Rick Cheung


The tunnel is in IPIP mode (sorry that I don't send any configurations
of tunnel) and IP MTU is set to 1500 bytes
and It doesn't include the case of BUG:CSCsa43492.


but the problem seems to be MTU problem and there's what I found> 


when I tried to ping the _tunnel destination_ ip address with 1500 bytes
packets - they pass through
but when I tried to ping _ip address of tunnel_ (address set on tunnel
interface) with the same packet size,
the packets are droped. that sounds to me like encapsulation,
de-encapsulation problem of IOS, 
what do you think about this?





Best Regards,
Nikolay Abromov
network administrator







-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Nikolay Abromov
Sent: Monday, February 21, 2005 4:47 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] problem with EIGRP


Hi There, 


I've got a problem with EIGRP, I run eigrp session over tunnel and the
session goes down in about 1min. below there are some logs from both
routers


Router A (7206 VXR-NPE-G1,IOS version 12.3.12) 

%DUAL-5-NBRCHANGE: IP-EIGRP(0) 1111: Neighbor 1.1.1.1 (Tunnel3) is down:
retry limit exceeded
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 1111: Neighbor 1.1.1.1 (Tunnel3)
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 1111: Neighbor 1.1.1.1 (Tunnel3) is down:
retry limit exceeded
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 1111: Neighbor 1.1.1.1 (Tunnel3) is up:
new adjacency


Router B (1750, IOS version 12.1.20)

EIGRP: Received HELLO on Tunnel1 nbr 1.1.1.2
AS 1111, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
K-value mismatch

I verified the configurations of both routers and assured there is no
mismatch of k-values,this is the output of 'show ip protocols" 

router A>
Routing Protocol is "eigrp 1111"
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0

router B>
Routing Protocol is "eigrp 1111"
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0


I also noticed that they'r 13 update messages which are constantly
pending in the queue.


"show ip eigrp neigh" 

H   Address                 Interface       Hold Uptime   SRTT   RTO  Q
Seq
                                                            (sec)
(ms)               Cnt Num
8   1.1.1.1          Tu3               11 00:00:50  150  5000 13  4695


Has anyone experienced similar problem?




Best Regards,
Nikolay Abromov
network administrator

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