Re: IEWB Vol2 Task4.1 - RIP domain on R1, R3 and SW1

From: Fahad Khan (fahad.khan@gmail.com)
Date: Sun Aug 31 2008 - 05:09:33 ART

I have not seen the topology, but as far as my perception is concerned, Yes,
163.1.0.0/16 covers all the prefixes of /24, although the interfaces that
have /24 networks are passive, but the interface that is connected to the
switch SW1 is not passive, and you have advertised 163.1.0.0, therefore
leaked all of the /24 prefixes towards SW1.Normal behaviour!

HTH

On 8/31/08, Nitro Drops <nitrodrops@hotmail.com> wrote:
>
> When configuring RIP process on R1, R3 and SW1. "Passive-interface
> default" have been used on both R3 and R1. "No passive interfaces" have
> been used on R1 F0/0 and R3 E0/0.
> Rack1R3#sh run | begin router rip
> router rip
> version 2
> passive-interface default
> no passive-interface Ethernet0/0
> network 163.1.0.0
> no auto-summary
> Rack1R1#sh run | begin router rip
> router rip
> version 2
> passive-interface default
> no passive-interface FastEthernet0/0
> network 163.1.0.0
> no auto-summary
>
> Qns : How come SW2 still can learn the routes for 163.1.13.0/24 via
> both R1 and R3? Even though this subnet 163.1.13.0/24 is not
> advertised by both R1 and R3 into RIP domain, as 'passive-interface
> default' command is used on both R1 and R3? Understand that this subnet
> falls into the major network 163.1.0.0/16. Does it means major network
> takes precedence over 'passive-interface default' command?
>
> Rack1SW2#
> Rack1SW2#sh ip route rip
> 163.1.0.0/16 is variably subnetted, 6 subnets, 2 masks
> R 163.1.35.0/24 [120/1] via 163.1.38.3, 00:00:21, FastEthernet1/14
> R 163.1.13.3/32 [120/1] via 163.1.18.1, 00:00:08, FastEthernet1/15
> R 163.1.12.0/24 [120/1] via 163.1.18.1, 00:00:08, FastEthernet1/15
> R 163.1.13.0/24 [120/1] via 163.1.38.3, 00:00:21, FastEthernet1/14
> [120/1] via 163.1.18.1, 00:00:08, FastEthernet1/15
>
> Rack1SW2#sh ip route 163.1.13.0
> Routing entry for 163.1.13.0/24
> Known via "rip", distance 120, metric 1
> Redistributing via rip
> Last update from 163.1.18.1 on FastEthernet1/15, 00:00:00 ago
> Routing Descriptor Blocks:
> * 163.1.38.3, from 163.1.38.3, 00:00:13 ago, via FastEthernet1/14
> Route metric is 1, traffic share count is 1
> 163.1.18.1, from 163.1.18.1, 00:00:00 ago, via FastEthernet1/15
> Route metric is 1, traffic share count is 1
>
> Rack1SW2#
>
>
>
>
> CheersNit
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-- 
Fahad Khan

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