From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Tue Feb 03 2004 - 14:38:19 GMT-3
At 4:29 PM +0200 2/3/04, Tahsin Hersan wrote:
>Hi,
>
>I am trying to be creative :) and I was wondering how we can set router-id
>to 0.0.0.0 if we want to? We can do it on other vendors boxes like nortel /
>lucent but on cisco i couldnt do it.
>
>"router-id 0.0.0.0" command accepted by router but it sets router id to
>0.0.0.1.
>
>Any comments / advises?
>
>Best Regards,
>Tahsin
>
What problem are you trying to solve with this creativity?
Seriously, whenever I run into a restriction like that, I tend to
want to look at the protocol specification (in this case, RFC 2328)
to see if there is a reason for the restriction. In particular, my
experience tells me that all zeroes and all ones values are
frequently reserved for some protocol-specific question.
Again trying to be helpful, the understanding needed at the CCIE
level isn't likely to come simply from exploring the ranges of
parameters than can be set.
For example, on page 65:
The Designated Router selected for the attached network. The
Designated Router is selected on all broadcast and NBMA networks
by the Hello Protocol. Two pieces of identification are kept
for the Designated Router: its Router ID and its IP interface
address on the network. The Designated Router advertises link
state for the network; this network-LSA is labelled with the
Designated Router's IP address. The Designated Router is initialized
to 0.0.0.0, which indicates the lack of a Designated Router.
... The Backup Designated Router is initialized to 0.0.0.0
indicating the lack of a Backup Designated Router.
Or on page 77,
The Hello packet also contains the IP address mask of the attached
network (Network Mask). On unnumbered point-to-point networks and
on virtual links this field should be set to 0.0.0.0.
These are not the only special cases of 0.0.0.0; other applications
include default destinations of router IDs.
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