From: Tony Olzak (aolzak@xxxxxxxxxxxxxxxxxxx)
Date: Fri Oct 13 2000 - 14:53:50 GMT-3
You can use the summary address to rig the config to work. The summary
address actually creates a null 0 route to the supernet you just configured
on the router you configured. This route IS redistributed into other routing
protocols. You don't have to use the default network command and it is
usually not allowed anyway, in most practice scenarios I've seen.
Tony
----- Original Message -----
From: "Sokhna Ndoye" <sndoye@hotmail.com>
To: <TCHEUNG@MEDUS.JNJ.com>; <adixon@houston.omnes.slb.com>;
<ccielab@groupstudy.com>
Sent: Friday, October 13, 2000 12:55 PM
Subject: RE: routing problem
> the ospf summary address is used to summarize external routes into ospf,
not
> to summarize out of ospf, you will have to use default-network on the
> redistributing router....
>
> Sokhna Ndoye
>
>
> >From: "Cheung, Tom [JJMI-AR]" <TCHEUNG@MEDUS.JNJ.com>
> >Reply-To: "Cheung, Tom [JJMI-AR]" <TCHEUNG@MEDUS.JNJ.com>
> >To: "'Aaron K. Dixon'" <adixon@houston.omnes.slb.com>,
> >ccielab@groupstudy.com
> >Subject: RE: routing problem
> >Date: Thu, 12 Oct 2000 16:17:30 -0400
> >
> >But I'm not allow to use static routes in this exercise. I'm not sure if
> >default-network will be considered static route?
> >
> >
> >-----Original Message-----
> >From: Aaron K. Dixon [mailto:adixon@houston.omnes.slb.com]
> >Sent: Thursday, October 12, 2000 3:13 PM
> >To: Cheung, Tom [JJMI-AR]; ccielab@groupstudy.com
> >Subject: RE: routing problem
> >
> >
> >If you've summarized the routes to 172.17.59.0/26 then it won't know
about
> >subnets above 192 due to your summary mask. I'm not sure what you mean
by
> >finding the 182.17.59.0 subnet. I don't see that in your table. You
could
> >use a default network on the IGRP router to allow it to route to the next
> >hop or send an additional summary route to the 172.17.59.192/26.
> >
> >Regards,
> >Aaron K. Dixon
> >
> >-----Original Message-----
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> >Cheung, Tom [JJMI-AR]
> >Sent: Thursday, October 12, 2000 2:48 PM
> >To: 'ccielab@groupstudy.com'
> >Subject: FW: routing problem
> >
> >
> >
> >
> >All,
> >
> >I have a general routing question. Here's the scenario:
> >
> > serial serial
> > r5 ---------------------- R1 ------------------> frame cloud
> > 172.17.59.64/26 (IGRP) 172.17.59.x (OSPF, VLSM)
> >
> >On OSPF side 172.17.59.x is variable subnetted into /28, /29 and /30.
> >I injected the OSPF routes into IGRP by "summary-address 172.17.59.0
> >255.255.255.192"
> >
> >From R5, I'm able to ping 172.17.59.5, 59.9, 59.17 etc. but was unable to
> >ping 59.193. It is "unroutable".
> >
> >My explanation to why 192.17.59.193 is "not routable" is that R5 knows
only
> >172.17.59.0/26 and 172.16.59.64/26. 192.17.59.192 is not a 192.17.59.0
> >subnet. Therefore R5 drops packets for 192.17.59.193. But then,
shouldn't
> >"ip classless" force the router to do longest match and find 182.17.59.0
> >for
> >59.193?
> >
> >
> >R5's show ip route, debug IP packet output during the ping fail are
> >attached
> >for your reference.
> >[r5#
> >r5#sh ip ro
> >Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> > D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> > N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> > E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
> > i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
> >default
> > U - per-user static route, o - ODR
> >
> >Gateway of last resort is not set
> >
> > 172.17.0.0/26 is subnetted, 2 subnets
> >I 172.17.59.0 [100/159250] via 172.17.59.65, 00:00:17, Serial0
> >C 172.17.59.64 is directly connected, Serial0
> > 10.0.0.0/24 is subnetted, 1 subnets
> >C 10.1.2.0 is directly connected, Ethernet0
> >r5#
> >r5#
> >r5#deb ip packet
> >IP packet debugging is on
> >r5#ping 172.17.59.193
> >
> >Type escape sequence to abort.
> >Sending 5, 100-byte ICMP Echos to 172.17.59.193, timeout is 2 seconds:
> >
> >00:11:20: IP: s=172.17.59.66 (local), d=172.17.59.193, len 100,
unroutable.
> >00:11:21: IP: s=10.1.2.1 (local), d=255.255.255.255 (Ethernet0), len 52,
> >sending
> > broad/multicast
> >00:11:22: IP: s=172.17.59.66 (local), d=172.17.59.193, len 100,
unroutable.
> >00:11:24: IP: s=172.17.59.66 (local), d=172.17.59.193, len 100,
unroutable.
> >00:11:26: IP: s=172.17.59.66 (local), d=172.17.59.193, len 100,
unroutable.
> >00:11:28: IP: s=172.17.59.66 (local), d=172.17.59.193, len 100,
unroutable.
> >Success rate is 0 percent (0/5)
> >
> >
> >
> >
> >
> >Tom
> >
> >
>
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