From: SANCHEZ-MONGE,ANTONIO (HP-France,ex2) (antonio.sanchez-monge@hp.com)
Date: Sun Jan 25 2004 - 12:24:58 GMT-3
Hi Sam,
Thanks for the post.
The behaviour I have seen is:
If a router receives a summary for a major network (10.0.0.0), and it has
already more specific subnetworks directly connected, it will suppress the
summary from the RIPv1 database.
Try adding 10.2.4.1/32 as a loopback address in R2 and you will see the same
behaviour. Null0 is at the end a "virtual local interface" too.
The idea behind this is: RIPv1 and classful routing protocols in general do
not support non-contiguous major networks.
Cheers,
Ato.
-----Original Message-----
From: Hossam [mailto:sam6626@yahoo.com]
Sent: domingo, 25 de enero de 2004 15:10
To: SANCHEZ-MONGE,ANTONIO (HP-France,ex2)
Cc: ccielab@groupstudy.com
Subject: RE: RIPv1 -RIP v2 and Summary to Null - Scenario!
Here you are Antonio,
The outputs you asked for at R2 are below ( before using "ip route 10.2.4.0
255.255.252.0 null0") .
Once i use the above command R2 installs the new to-null route, and the
"10.0.0.0" auto-summary learned form R4 starts to count to 180 seconds then
it goes to the hold and deleted later. See the show rip database below after
using the above command at the end of this message.
This happens while R2 is still recieving the 10.0.0.0 route from R4. But for
some reason it does't update its database.
I hope someone helps!!
Note: I snapshot these outputs while both routers were using RIP ver1 only.
No ver2 updates were inter send. But same happens with ver2 at R2 as i said
in my intial mail.
Thanks
SAM
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