From: Luis Rueda (userlerueda@hotmail.com)
Date: Sat Oct 08 2005 - 16:54:52 GMT-3
Dustin,
1. From what I recall and what I have seen, you are always told what to do
with the loopback addresses, in case they tell you to put it in an area of
your choosing, I would choose an area different to 0 if I have the choice,
and this is basically because once you put them on area 0 summarization or
range may be harder to achieve.
2. The 3 options you have are ip osp network point-to-point, redistribution
and area x range, be carefull with the latter because it requires the
loopback to be inserted in an area other than 0. Also be carefull with
Virtual links, remember that a router that has a virtual link to area 0
should be treated as an ABR, meaning that you also need to use the area x
range command in them.
3. At last, the summary or range command only eliminates the advertisement
for networks contained inside the summary orange, for instance if you have 3
networks 192.168.1.0/24 192.168.10.0/24 and 192.168.60.0/24 and you range it
or summarize it with a 192.168.0.0/20 which does not include the .60/24 net,
on other areas or router you will se both the 192.168.0.0/20 and the
192.168.60.0/24 networks.
Hope this helps.
Regards,
Luis
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
dusth@comcast.net
Sent: Saturday, October 08, 2005 2:31 PM
To: ccielab@groupstudy.com
Subject: Assign loopback interface into OSPF
Hi group,
1. I'm reading the ciscopress ccie lab study, most of the labs require
freestyle loopback interface assignment into ospf. Some routers have
loopback into area 0 or into area that LAN interface belongs to. Hoever some
loopback interfaces are assigned to local LAN area eventhough this router
has area 0 configure. Can someone give me a recommdation or best practice
about what area loopback interface should be in when the loopback interface
is on ABR router?
2. What options do I have besides "ip ospf network, redistribution, and area
x summary-address" if I want to advertise the loopback into OSPF as /24
instead or /32.
3. Also, if "area x summary-address" is configured but only for loopback
addresses in this area, should all other physical ip addresses in this area
still advertise out as normal subnet routes from this area?
Thanks all,
Dustin
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