From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed Aug 06 2003 - 07:16:37 GMT-3
Hi,
I discovered yesterday that it's necessary to clear the ospf process for a
router to change it's router id to a new value. Aside from activating a new
router id are there any other times when it's necessary to clear to ospf
process for config changes to take effect?
I also discovered that after a DR is elected on a multiaccess segment, and
then the ospf process is cleared, the DR remembers it was the DR and a new DR
is NOT elected even though another router should be the DR on that segment
based on having a higher router-id ( priorities are all equal) when the router
id is based on the highest loopback interface address.
But, if the router id is based on a manually entered id using the router-id
command, and then the ospf process is cleared, a new DR election does take
place and the router with a higher router-id when manually entered becomes the
DR.
Based on these experiments performed yesterday, it seems that it's very
difficult and time consuming and somewhat unpredictable to try to change which
router is the DR on a segment by changing the router id's of the routers
taking part in the election.
I know that I can use ospf priority to rig the DR election but I wanted to see
how well it is to rig the DR election based on router-id's. My conclusion is
that it's very difficult and the results will vary based on the order in which
the ospf processes are cleared on the router involved and whether various
interfaces on the broadcast segment are in the up or down state.
I'm wondering if anyone else has played around with this and if they have come
to different conclusions.
Thanks in advance, Raj
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