From: tom cheung (tkc9789@xxxxxxxxxxx)
Date: Thu Nov 15 2001 - 11:45:03 GMT-3
The default-network will have to be another classful network other than the
170.10.0.0, and known to igrp.
>From: SFeldberg@edeltacom.com
>Reply-To: SFeldberg@edeltacom.com
>To: "Chua, Parry" <Parry.Chua@compaq.com>
>CC: ccielab@groupstudy.com, nobody@groupstudy.com, "Ryaboy Vadim"
><VRyaboy@acuson.com>
>Subject: RE: default-network and igrp (classic flsm/vlsm)
>Date: Thu, 15 Nov 2001 09:21:53 -0500
>
>I think the key to his problem lies in here:
>
>"I've put ip default-network 170.10.0.0 on R4 All it did - it created
>static route in running-config: ip route 170.10.0.0 255.255.0.0 170.10.10.0
>It did not put any gateways of last resort on R4 or R1.
>
>170.10.0.0 is classful- 170.10.10.0 is not- it appears that there is a /24
>bit mask in use here. If the IGRP route was indeed classful
>(170.10.0.0/16), there would have been no static route created, a
>170.10.10.x address would have become the gateway of last resort and
>170.10.0.0 would have become the candidate default route in the routing
>table.
>
>Steve
>
>
>
> "Chua, Parry"
> <Parry.Chua@co To: "Ryaboy Vadim"
><VRyaboy@acuson.com>
> mpaq.com> cc: <ccielab@groupstudy.com>
> Sent by: Subject: RE: default-network
>and igrp (classic
> nobody@groupst flsm/vlsm)
> udy.com
>
>
> 11/15/2001
> 04:04 AM
> Please respond
> to "Chua,
> Parry"
>
>
>
>
>
>
>HI,
>
>My understanding on the requirement on inject of default network into
>IGRP are :
>
>1. It has to be a classful n/w.
>2. The n/w must know to IGRP.
>
>Based on your topology, the configuration using one classful n/w, how
>can we inject the same n/w as
>the default n/w to IGRP ? May be someone can explain this better...
>
>I have try out the ospf area range on 12.1 and it work for both area 0
>and other. I.e. you will see the summary
>of area 0 from other area and vice versa.
>
>In your configuration, one problem is at the IGRP border router as well
>as a OSPF other area router and has different subnet mask to the IGRP
>n/w. One way to address this problem is to create a lo interface that
>use
>one of the available /26 subnet but share the same /24 subnet.
>Redistribute and summary it to a single /24
>and it will be avilable at IGRP n/w. But we all know that summaration
>wlll create hole if not all address are used.
>
>Parry Chua
>-----Original Message-----
>From: Ryaboy Vadim [mailto:VRyaboy@acuson.com]
>Sent: Thursday, November 15, 2001 1:42 PM
>To: Chua, Parry
>Cc: 'ccielab@groupstudy.com'
>Subject: RE: default-network and igrp (classic flsm/vlsm)
>
>
>
>I thought if I use summarization - I don't need default network.
>With summarization - there is a problem. OSPF don't summarize from area
>0 to non-zero area.
>I just wonder if I can solve it using default network not summarization
>(on the side note my understanding is that summarization will not work
>here as I explained - I tried it - did not work and I saw messages on
>groupstudy confirming it).
>
>So, question remains - can I use default network and if yes, how?
>
> -----Original Message-----
>From: Chua, Parry [SMTP:Parry.Chua@compaq.com]
>Sent: Wednesday, November 14, 2001 9:39 PM
>To: Ryaboy Vadim; ccielab@groupstudy.com
>Subject: RE: default-network and igrp (classic flsm/vlsm)
>
> The Cisco CCO has a description on default n/w :
>
> http://www.cisco.com/warp/customer/105/default.html
>
> Since you are using a class B 170.10.0.0 for your topology, you
>can
>redistribute the
>ospf into IGRP. It all depends on how you configurae the OSPF, sinec
>R2/R5 at area 0,
>if R4/R5 at other area (eg 45), you can use area range to summaries /28
>and /26 to two /24 and then redistribute into IGRP at R4.
>
>Parry Chua
>-----Original Message-----
>From: Ryaboy Vadim [ mailto:VRyaboy@acuson.com]
>Sent: Thursday, November 15, 2001 12:18 PM
>To: 'ccielab@groupstudy.com'
>Subject: default-network and igrp (classic flsm/vlsm)
>
>
> Hello,
>
> Here is the scenario:
>
>
> R2 --- R5(E0) ---(E0) R4 (S0) --- (S1)R1
>
> R4,R1 running igrp
>R4- R5 - OSPF virtual link
>R5-R2 - OSPF area 0
>
> IGRP and OSPF mutually redistributed on R4. R1 (/24) don't see
>
>
> R4 S1 170.10.15.1/24
>R4 S0 170.10.15.1/24
>
>
> R4 (e0) 170.10.11.65 / 26
>R5 (e0) 170.10.11.66 / 26
>
> R2 -- R5 Frame Relay network 170.10.10.32/28.
>
> Classic FLSM/VLSM scenario. R1 (/24) don't see R2-R5 network .
>
>
> One of few solutions (right?)- use ip classless (I have it on)
>And use ip default-network.
>
> I've put ip default-network 170.10.0.0 on R4
>All it did - it created static route in running-config: ip route
>170.10.0.0
>255.255.0.0 170.10.10.0
>It did not put any gateways of last resort on R4 or R1.
>
> Can I use ip default-network to solve this problem?
>And how.
This archive was generated by hypermail 2.1.4 : Fri Jun 21 2002 - 06:45:16 GMT-3