From: srinivas pv (vsrinivas.paturi@gmail.com)
Date: Sat Dec 08 2007 - 16:33:29 ART
Hi,
In the following configs, there are chances that after reloading of routers,
172,16.101.1 may not become router-id. For ex. some other higher loopback
interface ip address can become router id. To avoid this, need to configure
router-id under OSPF processes.
router ospf 1
log-adjacency-changes
area 12 virtual-link 172.16.101.1
Thanks,
Srinivas
On Dec 9, 2007 12:47 AM, srinivas pv <vsrinivas.paturi@gmail.com> wrote:
> Hi Frank,
>
> I think the problem is due to missing of 'router-id' under OSPF process.
> Try configuring it and check once.
>
> Thanks,
> Srinivas
>
>
> On Dec 9, 2007 12:27 AM, Frank CCIE < frankccie@gmail.com> wrote:
>
> > 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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> > http://www.groupstudy.com/list/CCIELab.html
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