From: Chuah Eng Wee (chuahew@xxxxxxxxxxxxxxx)
Date: Wed Apr 28 1999 - 09:08:50 GMT-3
Derek,
for lab environment, I personally find assinging bogus address to loopback
interfaces
very useful. For e.g, u can set the loopback interface of Router 1 to be
200.200.200.1 and ROuter 2 to 200.200.200.2 etc.
I find it easier to analyse the ospf database this way.
Rgds
Eng Wee
At 14:23 27/04/99 +0100, Derek Fage wrote:
>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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