From: Ambern, Jeff (jambern@xxxxxxxxxxxxxxxxx)
Date: Wed Apr 24 2002 - 17:24:09 GMT-3
Please explain your reasoning. I'm don't see
why the behavior should be different.
Jeff
-----Original Message-----
From: Peter van Oene [mailto:pvo@usermail.com]
Sent: Wednesday, April 24, 2002 1:36 PM
To: Sam.MicroGate@usa.telekom.de; jambern@MerchantWired.com
Cc: ccielab@groupstudy.com
Subject: RE: How does OSPF enter routes into the routing table?
In this case, both should go into the table.
At 12:19 PM 4/24/2002 -0400, Sam.MicroGate@usa.telekom.de wrote:
>I think you are correct. The same prefixes with two different subnet masks.
>R4 receives 172.10.7.0/24 O IA and 172.10.7.0/28 O and then installs the
/28
>in the routing table. That is because, of cource, it is O.
>
>Sam
>
>-----Original Message-----
>From: Ambern, Jeff [mailto:jambern@MerchantWired.com]
>Sent: Wednesday, April 24, 2002 11:25 AM
>To: 'Sam.MicroGate@usa.telekom.de'
>Cc: 'ccielab@groupstudy.com'
>Subject: RE: How does OSPF enter routes into the routing table?
>
>
>I still believe that it has to do with the prefix being the same length
>and the first route is an intra-area route. Try making the /28 something
>other than subnet-zero and see the /24 shows up in the routing table.
>
>Jeff
>
>-----Original Message-----
>From: Sam.MicroGate@usa.telekom.de [mailto:Sam.MicroGate@usa.telekom.de]
>Sent: Wednesday, April 24, 2002 10:18 AM
>To: jambern@MerchantWired.com
>Subject: RE: How does OSPF enter routes into the routing table?
>
>
>What about the scenario below? did you take a look at it?
>
>Sam
>
>-----Original Message-----
>From: Ambern, Jeff [mailto:jambern@MerchantWired.com]
>Sent: Wednesday, April 24, 2002 11:14 AM
>To: 'Sam.MicroGate@usa.telekom.de'
>Subject: How does OSPF enter routes into the routing table?
>
>
>Ospf will insert Intra-Area routes into the routing table befor Inter-Area
>routes.
>The order of preference is:
>O
>IA
>E1
>E2
>Jeff
>
>
>--------------------------------------------------------------------------
>Hello all,
>
>Last night I worked in a distribution lab from fatkid.com. In this lab I
had
>the following problem:
>Area 2 is configured a virtual area between routers R5 and R4. I used area
0
>range command to summarize the /28 subnet into area 2. Now the problem is
R4
>receive both routes the 172.10.7.0/28 as O and 172.10.7.0/24 as O IA and
>strangely choose the first to install in the routing table. The /24 subnet
>gets suppressed and does not make it to the routing table. Shouldn't I see
>both routes in R4 because OSPF supports VLSM? Why OSPF choose the route
with
>the longer mask and ignored the one with shorter mask? If this the default
>behavior, How can I make the summary address /24 reach R4. Thank you all
for
>your help.
>
>
>
>172.10.7.0/28 172.10.128.0/26 LB0:172.10.5.4/24
>R2------------------------------R5------------------------------R4---------
-
>-------------------
>area 0 area 2 area 3
>Frame Relay Ethernet LB of R4
>
>At R5:
>area 0 range 172.10.7.0 255.255.255.0
>
>
>
>
>Elsayed Mohamed
>Sr. Network Consultant
>Microgateds, Inc.
>732-936-4413
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:58:18 GMT-3