From: Cavanaugh, Mike J (CAP, ITS, US) (Mike.Cavanaugh@xxxxxxxxxxxxx)
Date: Tue Apr 06 1999 - 14:58:07 GMT-3
A couple of thoughts off the top of my head:
Using a Point to Point Subinterface on the hub router implies that there is
only one router at the other end. If you want both spoke routers to use the
same subinterface on the hub router the subinterface type will need to be
changed to a Point to Multipoint. If you want each spoke router to use a
different subinterface on the hub router then this will need to be
configured as two separate networks.
Point to point : two separate networks.
On a Point to point network there is no need for a DR/BDR. If either router
goes down there is no backup available.
The OSPF network type will default to Point to point.
Point to multipoint : single network
I believe that the default OSPF priority is 1.
To change to priority in this configuration try placing the command:
IP OSPF PRIORITY 0
on the serial interface of each spoke router and place the command
IP OSPF PRIORITY 10
on the subinterface of the hub router.
I believe that the OSPF network type on a serial link is NONBROADCAST
(verify this I may be wrong). In this configuration you have two options:
Use the a NONBROADCAST network. Either accept the default (or if I am wrong
about the default place the command IP OSPF NETWORK NONBROADCAST on each
serial interface) and define the OSPF neighbors in the Router OSPF process.
Use the command IP OSPF NETWORK POINT-TO-MULTI (I think that is the correct
syntax) on each serial interface.
Other notes:
Don't forget your frame map or X.25 map statements, depending on your
network type.
Check the Hello and dead time of your OSPF interfaces. I believe that serial
interfaces and subinterfaces have different defaults.
HTH,
Michael
-----Original Message-----
From: Chuah Eng Wee [mailto:chuahew@cyberway.com.sg]
Sent: Tuesday, April 06, 1999 11:19 AM
To: ccielab@groupstudy.com
Subject: neighbor command
Hi all,
I have 3 routers in an NBMA network.
The hub router uses point-to-point subinterface
Two spoke router use physical interface
I want to make the hub router a DR, therefore, at the hub router, i use
router ospf 10
network ......
neighbor spokeA-ip
neighbor spkeB-ip
At spokeA,
router ospf 10
neigh Hub-ip priority 10
At spokeB,
neigh Hub-ip priority 10
I read from the documentation that if no priority is not specified, it'll
be priority 0,
which implies it will not participate in DB/BRD election. However, I get a
priority of 1
when I did not specify it. At the spoke, the configuration will change the
priority to 1
after a while even when I keyed in the priority to be 10.
Any idea what did I miss out or there's bug in the IOS ??
Thanks
Eng Wee
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