From: Reed, John (John.D.Reed@xxxxxxxxxx)
Date: Wed Nov 17 1999 - 21:29:58 GMT-3
Joe is right. There is no way to allow a specific router to always be
the DR. The decision is made during negotiation when the DR goes away,
one of the BDRs is elected from the contestants with non-zero priority. If
the old DR comes back, nothing happens until the current DR goes away (stops
sending hellos).
The priority setting simply chooses which will become the DR during an
election. There is not a "preempt" statement, like there is with HSRP.
I suppose you could Force an election by temporarily shutting down one of
the DR's interfaces...
JR (six days)
-----Original Message-----
From: Joe Soricelli [mailto:jsoricelli@ccci.com]
Sent: Wednesday, November 17, 1999 6:22 PM
To: ccielab@groupstudy.com
Subject: Re: ospf dr
Let me play Devil's advocate for a minute.
If R1 dies and both R2 and R3 have their priorities set to 0, then who
becomes the DR for the LAN segment that all non-DRs can form an adjacency
with? It should be no-one. In that case, R2 and R3 will not form an
adjacency and no routing will occur between them.
-Joe
------------------------------------------------------------------
Joseph M. Soricelli, CCIE #4803, CCNP, CCSI #20666
EMAIL: jsoricelli@ccci.com
Chesapeake Network Solutions Phone: (703) 207-0757
8110 Gatehouse Road, Suite 101E Fax: (703) 207-0441
Falls Church, VA 22042 E-Fax: (703) 783-0360
FYI - About Chesapeake: We are a Cisco professional services partner
as well as a Certified Training Partner. We provide network consulting
services including Network Assessments, Network Design and Implementation
Services, Network Management, Network Security, and Knowledge Transfer.
As a training partner, we offer most of the Cisco training courses as well
as
training for Fore, NetScout, and CheckPoint-1 Firewalls. We now have 23
CCIEs on our staff of instructor/consultants.
-------------------------------------------------------------------
-----Original Message-----
From: Antonio Sabella <Antonio.Sabella@anixter.com>
To: ccielab@groupstudy.com <ccielab@groupstudy.com>
Date: Wednesday, November 17, 1999 5:26 PM
Subject: Re: ospf dr
>If you want R1 to be the DR at all times, you can simply set the IP OPSF
>Priority to 0 on R2 and R3's ethernet interfaces. Setting the priority to
0 on
>those interfaces will not allow those routers to become DR's.
>
>
>
>
>nobody@groupstudy.com on 11/17/99 12:09:13 PM
>To: ccielab@groupstudy.com@internet@WTAXE
>cc:
>Subject: ospf dr
>
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>Hi, everybody
>there is a confuse problem about ospf DR.
>if there're 3 routers in a ethernet: r1,r2,r3
>and also in a same area.
>
> r1 r2 r3
> | | |
>- ----+-----+------+------
>
>how can i set r1 always be a DR router? even
>though r1 is recovered after shutdown.
>
>thanks in advance.
>
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:21:55 GMT-3