From: Bhuvanesh Rajput (ashu2084@gmail.com)
Date: Fri Feb 20 2009 - 09:35:52 ARST
Hi,
I got confused while going thru the EIGRP Advanced Technoloy Work book
from IE 4.1 vol-1.
In eigrp summarization lab, eigrp auto-summar feature behaving slight
different & same has been given in that work book also.
Brgds
Bhuvanesh Rajput
On Thu, Feb 19, 2009 at 11:00 AM, vinny <vinny@foxmail.com> wrote:
> 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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