From: Rick Stephens (rstephens@xxxxxxxxxx)
Date: Wed May 23 2001 - 14:26:08 GMT-3
Yes, I think you are right, the router I tested is likely 11.2 or 11.3
(Enterprise), I have another that is running 12.0. I will test again.
Thanks for the info.
-----Original Message-----
From: Jon Carmichael [mailto:jonc@pacbell.net]
Sent: Wednesday, May 23, 2001 9:57 AM
To: Rick Stephens; ccielab@groupstudy.com
Subject: RE: OSPF: Changing Router ID
That "feature" is totally IOS dependant. I found that if you use 11.2 the
router ID would change easily. I found that with 12.0, --you have to
reload the router to get he ID to change. Once a 12.0 router would get
hold of an ID from where-ever, -whether physical or loopback, you could not
force it to let go. However, there may be one exception. There is a new
command in 12.0 under the router configuration mode, --"router-id" which
allows you to set the ID, however when you use it, --you get a warning..
"Reload or use "clear ip ospf process" command, for this to take effect"
Make sure you update your resume before you do that on a production router.
Likely Doyle's book is dated now, as the second portion may have been
written before 12.0 and the first portion may have been written in the 11.3
time. Books don't come out in a single day, -and the IOS is a moving
target.
JONC
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Rick Stephens
Sent: Wednesday, May 23, 2001 7:25 AM
To: ccielab@groupstudy.com
Subject: OSPF: Changing Router ID
According to Doyle (Vol 1) p.413, "Cisco's OSPF will continue to use a
Router ID learned from a physical interface even if the interface
subsequently fails or is deleted."
Later on p.524, "If a physical interface from which the Router ID was taken
experiences a hardware failure, if the interface is administratively shut
down, or if the IP address is inadvertently deleted, the OSPF process must
acquire a new Router ID. Therefore, the router must prematurely age and
flood its old LSA and then flood LSAs containing the new ID."
These statements appear to be contradictory. I did test in my lab by
changing the IP address of the highest Interface (Router ID), both Loopback
and with no looback on a physical, and the Router ID changed on the fly. So,
the second statement seems to be true. The question is whether the first
statement false or does it apply to a special circumstance?
Thanks.
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