From: Scott Morris (swm@emanon.com)
Date: Sat Sep 01 2007 - 20:03:00 ART
I think you'll find lots of references in the archives... But the short
answer is that your switch allows an extra 4 bytes for a dot1q tag within
the ethernet frame.
Using the "ip ospf mtu-ignore" command on the router will also do wonders.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
smorris@ipexpert.com
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tandou Mohamed
Sent: Saturday, September 01, 2007 6:25 PM
To: ccielab@groupstudy.com
Subject: %OSPF-5-ADJCHG
Hello Group
I configured ospf between a vlan interface and a router. The config is
listed below. after the configuration i was getting this error message:
" 01:25:25: %OSPF-5-ADJCHG: Process 1, Nbr 150.1.5.5 on Vlan58 from DOWN
to DOWN, Neighbor Down: Ignore timer expired "
i did sh int vlan58 and found out the MTU was 1504. i changed the MTU to
1500 and the error no longer appear. can someone explain why the MTU was set
to 1504 when i created the vlan ? this is the first time i see this kind of
problem.
Thanks
Ben
Vlan58 is up, line protocol is up
Hardware is EtherSVI, address is 0019.aab4.f745 (bia 0019.aab4.f745)
Internet address is 129.1.58.8/24
MTU 1504 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
728 packets input, 109425 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
766 packets output, 66407 bytes, 0 underruns
0 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
SW1
interface Vlan58
ip address 129.1.58.8 255.255.255.0
!
router ospf 1
router-id 150.1.8.8
log-adjacency-changes
network 129.1.58.8 0.0.0.0 area 0
network 150.1.8.8 0.0.0.0 area 0
R1
router ospf 1
router-id 150.1.5.5
log-adjacency-changes
network 129.1.45.5 0.0.0.0 area 0
network 129.1.54.5 0.0.0.0 area 0
network 129.1.58.5 0.0.0.0 area 0
network 150.1.5.5 0.0.0.0 area 0
---------------------------------
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when.
---------------------------------
Sick sense of humor? Visit Yahoo! TV's Comedy with an Edge to see what's on,
when.
This archive was generated by hypermail 2.1.4 : Sat Oct 06 2007 - 12:01:09 ART