From: Ron Trunk (rtrunk@xxxxxxxxxxxxx)
Date: Wed Jul 14 1999 - 10:04:33 GMT-3
Stanley,
>I tested a OSPF lab from Caslow book ( OSPF MD5 authentication ) but my
>strategy was to use loopback interfaces for all the routers.
>
>I added loopback interfaces to all the routers ( 4 of them ) and would like
>to know :
>
>1) What are the issues involve in using loopback interfaces ?
Just remember that the router uses the numerically highest loopback address
as its router ID.
This could be a problem if you set up OSPF and then add additional
loopbacks -- your router ID could change.
It does not matter if OSPF is enabled on the lookback.
>
>2) I use loopback interfaces and put all of them on OSPF Area 0...
>Is this the correct method / approach ?
>Should I put them on another Area instead ?
You can have ospf announce lookbacks or not; there are pros and cons both
ways. But if you do, the lookbacks should be in the same area as other
router interfaces.
>
>3) In my routing table, I get a O ( OSPF route ) for all the other loopback
>interfaces,
>Is this allowed on the CCIELAB exam ?
I can't imagine why not, unless they ask you not to..
>
>*** I use loopback interface because I wanted to maintain consistency when
>OSPF uses as a Router ID, ( so it does not change... ) and save me time
with
>issuing the ip ospf priority XXX commands for all the routers and also I
>find this is a better approach for troubleshooting...
>
>Would appreciate any feedback on this loopback interface issue..
>
>
>
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