From: Popovich, Michael (MPopovich@xxxxxxxxxxxxxxx)
Date: Fri Sep 14 2001 - 12:40:30 GMT-3
This is used in router redistribution.
You would do this for summarization of major networks to your core
routers so the routing tables at the core are not as long.
The idea being that the core would have routing tables of major networks
and as the packet traverses the network it is passed on to routers that
have more detailed information on a smaller amount of the network.
Summarization will be hit on the CCIE in regards to Advanced IP design.
In the issue below the advertisement to the BGP neighbor will have to
match the route map. According to the route map the only network that
will be advertised to the network will be the Class C network of
192.168.10.0/24.
Meaning that this router only has routing information for that network
so don't send any other traffic to it.
Hope this helps.
Michael
-----Original Message-----
From: Peter Slow [mailto:pslow@planetarynetworks.com]
Sent: Friday, September 14, 2001 9:50 AM
To: 'Williams, Glenn '; ''ccielab@groupstudy.com' '
Subject: RE: Access list
Wow! This is the only other usage of access lists like this that i have
seen!!! The only other person i have seen do this is my friend steve....
when you use an access list like this, it functions the same as a prefix
list.
great question!!!
-Peter Slow
-----Original Message-----
From: Williams, Glenn
To: 'ccielab@groupstudy.com'
Sent: 9/14/2001 6:24 AM
Subject: Access list
Hi all,
Access lists are still difficult for me. A lab asks to allow only
classful
routes in. The following solution was purposed, I guess to allow only
one
particular class 'C' route? Anyway, the use of the extended access
list
here has me confused. Can anyone explain why this would be used and how
it
works?
router bgp 101
no synchronization
neighbor 170.1.1.254 route-map classfull in
!
access-list 101 permit ip 192.168.10.0 0.0.0.255 host 255.255.255.0
route-map classfull permit 10
match ip address 101
!
Thanks
God Bless America
GW
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