From: Mark Mahan (mmahan@caprock.com)
Date: Mon Nov 05 2007 - 16:33:23 ART
I haven't set my home lab up for remote access yet so can't verify my
supposition. Since I'm supposing...
If they are all connected to a switch, block direct multicast
communication between R2 and R3 using private VLANs and use local
proxy-arp at R1 for unicast communication between R2 and R3. OSPF
neighbor relationships will form between 1 and 2 and 1 and 3 and with
1's priority set high then it will be the DR and if it dies then OSPF
dies but you are assured R1 being the DR when it comes back up. Be
great is node 1 was a routing switch and the other two were routers...
I don't know if the DR would react to the R2 or R3 hello not showing the
other in the neighbor list.
Mark Mahan
Network Engineer
-------------------------------
CapRock Communications
4400 S. Sam Houston Parkway E.
Houston, Texas 77048
Office: 832 668 2528
mmahan@caprock.com
www.caprock.com
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-----Original Message-----
From: Mark Mahan
Sent: Monday, November 05, 2007 12:07 PM
To: Eric Phillips; ccielab@groupstudy.com
Subject: RE: Any way to force OSPF DR other than "priority 0"?
If there is no restriction on setting network types, then what about
making the interfaces on the segment non-broadcast and setting the
neighbors' priorities to 0 with the neighbor command on the DR?
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Eric Phillips
Sent: Monday, November 05, 2007 11:05 AM
To: ccielab@groupstudy.com
Subject: Any way to force OSPF DR other than "priority 0"?
Hey all,
I have done quite a bit of Googling and DOC-CD reading, and have not
found
anyone offering any clever ways to force the election of a certain
router as
the DR besides setting the priority to 0 on all other routers.
For example, if I had a question that asked me to ensure Router1 was
always
the DR on a certain segment without touching the configuration of
Router2
and Router3 I can set the priority very high on Router1, but if Router1
boots a few seconds later than Router2, Router2 will be the DR even if
it
has it's default priority of 1. The only way I can think to completely
guarantee Router1 is always the DR is to make the priority 0 on all
other
routers.
Am I missing something obvious, or am I over thinking this too much? I
have
not seen this asked in any practice labs, just theorizing what could
happen.
-Eric
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:28 ART