From: Hunt Lee (ciscoforme3@yahoo.com.au)
Date: Sun Feb 09 2003 - 03:07:47 GMT-3
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". And for the backbone routers to summarize
stuff in the other direction (back to L1 routers), then we would use "level-1". So
when would one use the keyword "level-1-2"??
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.
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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