From: Peng Li (lipeng@xxxxxxxxxx)
Date: Sun Sep 09 2001 - 22:43:18 GMT-3
I did it today just like the result of Jeff.
I guess that you should wait or shut down the interface after configuring the "
summary" command, I don't rember whether I did it intentionally or not. The LSP
will later be expired for 1200secs.Just like LSA in Ospf, just reverse count-d
own.
Maybe I'm wrong, not feeling confident about ISIS. Just a hint.
peng
----- Original Message -----
From: <Mark.Reyero@gecits.ge.com>
To: <>
Sent: Wednesday, August 15, 2001 5:18 PM
Subject: ISIS Summarization; Doyle Vol 1. pp 664 - 668
> Interesting ISIS issue I am encountering...
>
> I am configuring the ISIS Route Summarization example for Doyle Volume I pp 6
65 - 668. Initial config is as follows:
>
> R1 - 2513 (Geneva)
> Int E0 172.16.1.1/24
> Int Lo0 172.16.2.1/24
> Int Lo0 172.16.3.1/24
> Int To0 172.16.4.2/24 > to Int To0 on R2 -2502 (Zurich)
> Router ISIS (area 1)
> net 01.0000.0000.306e.c209.00
>
> R2 2502 (Zurich)
> Int To0 172.16.4.1/24 > to int to0 on R1 Geneva
> Int S0 172.16.8.2/24 > to Int S0 on R3 2520 (Madrid)
> Router ISIS (area 1)
> net 01.0000.0000.30b1.2ba9.00
>
> R3 2520 (Madrid)
> Int S0 172.16.8.1/24 > to Int S0 on R2 Zurich
> Int s1 172.16.9.1/24 > to int s0 on R4 Bonn
> Router ISIS
> router isis (area 2)
> net 02.0000.0010.7be8.7f53.00
> is-type level-2-only
>
> R4 2514 (Bonn)
> Int e0 172.16.19.1/24 > to int fa0/0 Frankfurt
> Int S0 172.16.9.2/24 > to int s1 on R3 Madrid
> Router ISIS (area 3)
> net 03.0000.0010.7b38.6414.00
>
> R5 3640 (Frankfurt)
> Int fa 0/0 172.16.19.2/24 > to int e0 on Bonn
> Int fa 1/0 172.16.16.1/24
> Int lo0 172.16.17.1/24
> Int lo1 172.16.18.1/24
> Router ISIS (area 3)
> net 03.0000.00b0.64ef.8900.00
>
> According to Doyle, I should add:
> To Zurich:
> summary-address 172.16.0.0 255.255.248.0
>
> To Bonn:
> summary-address 172.16.16.0 255.255.248.0
>
> Expected result, according to Doyle:
> "Any more-specific destination address that fall with the summarization range
are suppressed..."
> Only L2 summarized routes should show on Madrid.
>
> However, on my routing table on Madrid, I see all routes, including the /24 a
nd the /21 summarized routes?
>
> So, I add the appropriate summary routes to Geneva:
> summary-address 172.16.0.0 255.255.248.0
>
> And Frankfurt:
> summary-address 172.16.16.0 255.255.248.0
>
> Results:
> On Madrid, I get the expected summarized /21 routes as expected originally! :
) No more /24 routes!
>
> However
> On Zurich, I still see my /24 subnet from my own area, and more perplexing, t
he summarized 172.16.0.0/21 appears as a L2 route.
> Same is true with the area 3 subnets on Bonn, area 3 /24 area there as L1, bu
t the summarized 172.16.16.0/21 appears as a L2 route.
>
> Is this the expected result?
> BTW: the IOS of the 2500s is c2500-js-l.120-9.bin and the 3640 is c3640-ajs40
-mz.120-3c (both Enterprise Plus).
>
> Thanks in advance!
>
> Mark G. Reyero, CCDP, CCNP, MCP
> Associate Internetworking Engineer
> GE Capital IT Solutions
> 626C Admiral Drive, PMB214
> Annapolis, MD 21401
> Phone: 866-836-4044 Fax: (410) 295-7217
> Cell: 443-956-6076 mailto:mark.reyero@gecits.ge.com <mailto:mark.reyero@gec
its.ge.com>
> Web: http://www.gecits.com <http://www.gecits.com>
>
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