From: Derek Fage (Derekf@xxxxxxxxxxx)
Date: Tue Apr 27 1999 - 10:23:00 GMT-3
Thanks Joel (and others).
Whilst I personally always try to use loopback addresses in production (also
useful to use a source addresses for SNMP traps and TACACS requests), I was
just wondering about the lab.
When given a scenario, (such as configure up an OSPF virtual link), on some
routers that may not have loopback addresses set, I assume that there is no
reason why you cannot setup loopback addresses.
When using loopback interfaces for this sort of thing, would you tend to
allocate them with /32 masks and add them to the routing tables to assist on
connections etc), or would you group them into different subnets depending
on area / location etc... ?
Derek...
> -----Original Message-----
> From: Ekis, Joel [SMTP:Joel.Ekis@Connect.Xerox.com]
> Sent: 27 April 1999 13:51
> To: Derek Fage; 'ccielab@groupstudy.com'
> Subject: RE: IP config to assist in troubleshooting
>
> I hesitate to say 'always' since the industrious individual can find the
> exception. However, it usually is a good idea to make use of the loopback
> interface in OSPF and DLSW configurations. This will lend stability to
> your
> network design.
>
> Joel Ekis, CCNA, CCDA
> Xerox Connect
> Sr. Enterprise Consultant/Enterprise Network Services
> Phone: 913-696-0888, x234
> Pager: 800-697-0359
> joel.ekis@connect.xerox.com <mailto:joel.ekis@connect.xerox.com>
>
>
> -----Original Message-----
> From: Derek Fage [SMTP:Derekf@itexjsy.com]
> Sent: Tuesday, April 27, 1999 3:01 AM
> To: 'ccielab@groupstudy.com'
> Subject: IP config to assist in troubleshooting
>
> Hi there,
>
> I was looking at the troubleshooting scenarios currently on
> www.ccieprep.com
> and have a question for the group.
>
> One of the scenarios was with OSPF and a virtual link that is no
> longer
> working after lunch. It turns out that what happens is that one of
> the
> routers has been rebooted which caused the router id to change. This
> was
> becuase the router id was set when OSPF was started, and then
> another
> interface was configured for IP with a higher address so that this
> became
> the router-id when the router was rebooted.
>
> My question is regarding how to assign IP addresses when initially
> configuring the lab. Is it better to configure loopback addresses to
> stop
> this sort of thing happening ?
>
> Derek...
>
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