From: ccie2k4@gmail.com
Date: Wed Jun 27 2007 - 22:25:48 ART
Hi Serhat,
Thanks for your reply.
Would it make sense to summarize all the /32 loopbacks at the core or
distribution assuming that your core router loopbacks are also part of the
summary range and so are the distribution routers?
Thanks for helping.
On 6/26/07, Serhat Aslan <serhatworks@gmail.com> wrote:
>
> Hi,
>
> q1: beside the ip addres hierarchy, take the problem as hardware
> limitations and design practice, the main objective is to load the minimal
> system resources on the core system. When the router take any prefix
> generally it have to store its information based tables, you can accept them
> as routing tables/database table/etc. It have to use memory also cpu cycle
> for compile them for the accepted routing operations. Any logical operations
> reduce this system performance so the main goal is keep this load as min.
>
> q2: yes, Summary-routes are generally policy based operations(manual), the
> null0 helps you simplify the process and give you more control over the
> summarization of routes. But any kind of wrong logical operation probably
> trigger the black-hole routing or packet ping-pong.
>
> Serhat Aslan
>
>
>
>
> On 6/27/07, ccie2k4@gmail.com <ccie2k4@gmail.com > wrote:
>
> > Hi group,
> >
> > Q1.
> > Just want to confirm best practices for summarization in a real world
> > scenario. Reading various docs and whitepapers it says that the
> > summarization should occur on the distribution layer as per the
> > guidelines
> > however say you are using a range from the same subnet between your core
> > and
> > distribution would it still be ok to summarize at the distribution. For
> > eg:
> > say you have a range 10.10.10.0/24 and u are using loopback ip's (all
> > /32's)
> > on all your routers from this range (even on the core and distribution)
> > than
> > where would you summarize this network. Does it make sense than to
> > summarize
> > all the /32's from this range at the core into a /24 and advertise it
> > out.
> >
> > Q2.
> > Another question I am trying to figure out what could be the effect if
> > this
> > summary somehow found its way back into your environment through the
> > redundant links which would definetly happen in this case. I don't think
> > it
> > should have any adverse effects since the other devices would only refer
> > to
> > this route if they do not have a more specific route and even than the
> > worst
> > would be that depending on the metric that it chooses (this summary
> > route
> > will be configured and advertised on multiple devices) for this route it
> >
> > would just drop it since the summary would be to null0. Does this make
> > sense
> > or am I missing something? Thx for your help.
> >
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