From: Frank CCIE (frankccie@gmail.com)
Date: Sat Dec 08 2007 - 15:57:23 ART
Hi, Experts,
In my lab scenario, OSPF network type NON-Broadcast (NBMA) is set in
Ethernet port to fulfill the lab requirement and "neighbor" statement is
added in OSPF process. The configuration runs well as expected. I save the
config and reload.
The "neighbor" statement is lost in running-config during the router reload.
Consequently, no neighbor is created for the NBMA netowrk. (Please see the
error msg in reloading below). The "neighbor" statement is still in
startup-config. Then I copy startup-conf to running-config after loading,
IOS does not show any error and everything is normal.
After trouble-shooting, I found "area virtual-link" causes the problem. If
the "area virtual-link" is removed, the reload procedure is normal. When
"area virtual-link" is added, the "neighbor" statement always lost due to
IOS misjudgement - the network is NOT a NBMA.
I do not know it is my configuration problem, or a race condition during the
load? The router is 3640 and IOS version is 12.4. Could you shine a light?
Thank you very much.
Frank
================================
interface FastEthernet0/0.10
description This port connects to Area 12. It is a NBMA netwok
encapsulation isl 10
ip address 172.16.25.2 255.255.255.0
no ip redirects
*ip ospf network non-broadcast*
router ospf 1
log-adjacency-changes
* area 12 virtual-link 172.16.101.1
* network 172.16.12.0 0.0.0.255 area 12
network 172.16.25.0 0.0.0.255 area 10
* neighbor 172.16.25.7
*
#sh version
Cisco IOS Software, 3600 Software (C3640-JK9O3S-M), Version 12.4(12),
RELEASE SOFTWARE (fc1)
/* Reload and IOS shows an error message during reload*/
# reload
... ...
Processor board ID 15663547
R4700 CPU at 100MHz, Implementation 33, Rev 1.0
1 FastEthernet interface
4 Serial interfaces
DRAM configuration is 64 bits wide with parity disabled.
125K bytes of NVRAM.
32768K bytes of processor board System flash (Read/Write)
*OSPF: Neighbor command is allowed only on NBMA and point-to-multipoint
networks
*
Press RETURN to get started!
... ....
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