From: vinny (vinny@foxmail.com)
Date: Thu Feb 19 2009 - 03:30:42 ARST
Net He basically said it all. Just a quick note about the difference between RIP and EIGRP manual summarization - RIP can only summarise to the major network boundary and EIGRP doesn't have this limitation. Put it in another way is that RIP only support VLSM but no CIDR while EIGRP support them both. RIP manual summariztion doesn't support supernetting.
Another difference is that when manual summarizing with EIGRP, it generates a summary route pointing to Null0 interface, which could cause routing loops if you are doing mutual redistribution on the same router. This is something I just come to realise yesterday and think it might worth sharing.
Cheers
2009-02-19
vinny
7"<~HK#: NET HE
7"KMJ1<d#: 2009-02-19 09:43:56
JU<~HK#: ashu2084@gmail.com; ccielab@groupstudy.com
3-KM#:
VwLb#: RE: AUTO SUMMARY--------in EIGRP , RIP and BGP..
-RIP auto-summary on
before the routes (including locally generated and received RIP routes from
other RIP routers) advertised out on an rip interface, the process compares
the class of routes and the interface address, if different, then summarize
respective routes to class boundary, and advertised out. For example, route
173.24.23.0/24 will be advertised out as 173.24.0.0/16 on interface with ip
address 10.1.1.1 255.255.255.0. But routes 172.16.1.0, 172.16.2.0, 172.16.3.0
will not be summarized on interface with ip address 172.16.4.4 255.255.255.0.
-EIGRP auto-summary on
it only summarizes the locally generately EIGRP routes to class boundary, has
no effect on received-and-then-advertised-out routes.
-BGP auto-summary on
it is used to select routes into BGP process.
Best Regards,
Net (Xin) He
> Date: Wed, 18 Feb 2009 23:19:14 +0530
> Subject: AUTO SUMMARY--------in EIGRP , RIP and BGP..
> From: ashu2084@gmail.com
> To: ccielab@groupstudy.com
>
> Hi,
>
> Can anybody explain the functioning of auto-summary with EIGRP, RIP and
BGP?
> or
> How does it work differently in each routing protocol?
>
>
>
> Cheers!
>
> Bhuvanesh Rajput
>
>
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