From: Jonathan Hays (nomad@gfoyle.org)
Date: Sat Dec 27 2003 - 20:30:18 GMT-3
you wrote:
Until I added the redistribute connected under the ospf and is-is I
could
see the routes on R4 but they were not pingable. I could not see R4's
routes on R2 at all. I don't understand why I would need to redistribute
the connected.
I know there has been some discussion about this on several lists, but I
was not able to find the threads I was looking for.
Can you help explain or point me to a link for explanation?
Thanks Much
Happy New Year!!!
Debbie
= = =
I'm not sure my response will give you exactly what you are looking for,
but hopefully it will be of some minor help. I'm not sure anyone has
posted an in-depth coherent discussion of the internal working of IS-IS
on this list. And I think that is the ultimate reason for this behavior.
Regardless of the underlying theory, be prepared to redistribute
connected into ISIS, regardless of what the other protocol is. I doubt
you would be penalized (but I'm not a Cisco exam grader) it's also a
good idea to use a route map whenever doing redistribute connected. It's
best to lock down everything you can in your configuration. The more
control, the better. And when you create a route-map for a connected
interface you can skip the extra step of creating an access-list:
redistribute connected route-map CONN2ISIS
!
route-map CONN2ISIS
match interface Serial0/0.123 loopback 0
The book "IS-IS Network Design Solutions" by Abe Martey (ISBN
1-57870-220-8) has a 26 page section (pages 192-217) entitled "Comparing
Integrated IS-IS and OSPF." There is also a brief section on
redistribution (pages 273-278) but I don't believe the specific issue of
"redistribute connected" is examined in the book. However, it's a great
resource for CCIE Lab preparation.
That said, the ISIS Technical Support page is a good place to start
looking for answers:
http://www.cisco.com/pcgi-bin/Support/browse/psp_view.pl?p=Internetworki
ng:ISIS&viewall=true
Have fun!
Jonathan
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