From: Peter van Oene (pvo@usermail.com)
Date: Sun Feb 09 2003 - 11:52:41 GMT-3
At 05:07 PM 2/9/2003 +1100, Hunt Lee wrote:
>Hi Peter,
>
>Thank you so much for your fast response. Ok, so for L1 routers to
>summarize routes
>into backbone, we would use "level-2".
Yes, but this would be used on an L1L2 router in the case of inter area
summarization. For redistribution, an L1 router would suffice.
> And for the backbone routers to summarize
>stuff in the other direction (back to L1 routers), then we would use
>"level-1".
Yes, but again, same point as above.
> So
>when would one use the keyword "level-1-2"??
Redistribution into both levels or summarization in both directions at the
same time.
>Also, according to TCP/IP VOL 1 (Solie), it mentioned that the ISIS
>summary-address
>command would automatically suppress on the more-specific routes during
>summarization, however I found that both the summary and the more specific
>routes
>show up on all the downstream routers.
Summary address should filter the contributing summaries. If it doesn't
you may have a buggy IOS.
Pete
>THanks in advance,
>
>Best Regards,
>Lee
>
> --- Peter van Oene <pvo@usermail.com> wrote: > At 01:18 PM 2/9/2003
> +1100, you
>wrote:
> > >Hi friends,
> > >
> > >Can someone please explain to me what is the difference between the
> "level-1",
> > >"level-2" & "level-1-2" keywords for the summary-address command for
> ISIS? And
> > >should one use each of these keywords?
> >
> > The level option specifies where the summary command should be
> applied. By
> > default, it is applied to any routes being injected into the L2
> > domain. However, you can change this to L1, or L1-L2. Hence, if you were
> > redistributing routes into an L1 domain on an L1-only router (cisco
> > supports this) you could use L1. Further, for routes leaked from the
> > backbone into an L1 area, you would need to specify L1 in the event that
> > you wanted to summarize in that direction.
> >
> > I would suggest practising leaking routes into an L1 domain from the
> > backbone while summarizing to get a good feel for this (and correct me if
> > I've taken any liberties with the technology :)
> >
> > Pete
> >
> >
> >
> >
> > >I have been using just "summary-address <10.0.0.0 255.0.0.0>" without any
> > >keywords,
> > >and it seems to always work fine...
> > >
> > >Thanks so much for your help in dvance,
> > >
> > >Best Regards,
> > >Hunt
> > >
> > >http://greetings.yahoo.com.au - Yahoo! Greetings
> > >- Send some online love this Valentine's Day.
> > >.
> > .
>http://greetings.yahoo.com.au - Yahoo! Greetings
>- Send some online love this Valentine's Day.
>.
.
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