If anyone has a router to do debugs on, please check this. The Cisco
documentation says that it only sends out RIP updates on the networks (and
thus, interfaces) indicated as part of router rip, which makes perfect sense
to me.
from
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/np1_c
/1cprt1/1crip.htm
comes
"RIP sends updates to the interfaces in the specified networks. If an
interface's network is not specified, it will not be advertised in any RIP
update."
So, I believe James is correct, based on the documentation.
-e-
----- Original Message -----
From: "Coleman, Jason"
To:
Sent: Friday, April 27, 2001 10:56 AM
Subject: RE: RIP Updates [7:2270]
> My understanding is that when you enable RIP, it will broadcast the route
> table out all interfaces where IP is running. The network statement is
used
> to designate which networks are added to the route table.
>
> Example:
>
> E1 = 10.1.1.1 /8
> E2 = 11.1.1.1 /8
> E3 = 192.168.1.1 /24
>
> Router rip
> Network 10.0.0.0
> Network 11.0.0.0
>
> The route table will contain the 10.0.0.0 /8 and 11.0.0.0 /8 networks and
> NOT the 192.168.1.1 /24 network. However the route table will be
broadcast
> out all 3 Ethernet ports. If you do not want the table broadcast out a
> certain port, then you have to use the passive-interface command.
>
>
> Jason Coleman - CCNP, CCDP
> Customer Engineer
>
>
> -----Original Message-----
> From: James Haynes [mailto:[EMAIL PROTECTED]]
> Sent: Friday, April 27, 2001 10:47 AM
> To: [EMAIL PROTECTED]
> Subject: RIP Updates [7:2270]
>
> I'm currently having a "discussion" with a fellow employee
> who passed the
> CCIE Written about a year ago. Has no plans to take the lab,
> but that's
> neither here no there. He claims that when RIP is enabled on
> a router it
> floods it's updates out all interfaces on the router by
> default. I was of
> the impression that the updates are only broadcast out
> interfaces that have
> ip addresses in the same major network as the network
> command when
> configuring RIP.
>
> For example:
>
> A router with four interfaces (addresses made up)
>
> E0 130.10.12.1
> E1 130.10.13.1
> S0 130.10.20.1
> S1 170.23.15.1
> To0 no ip address, but up for bridging.
>
> If I configure RIP as:
>
> router rip
> network 130.10.0.0
>
> then E0,E1,and S0 will send Rip updates out those
> interfaces, but S1, and
> To0 interfaces will not. Is this correct? I've been looking
> through some of
> my books and on CCO and from what I gather RIP broadcasts a
> RIP Request
> Message on each RIP-enabled interface and receives a RIP
> Response message
> from a neighboring RIP router that includes that routers
> routing table. Are
> the RIP-enabled interfaces those interfaces in the same
> major network as the
> network command? Would a router running RIP on the far side
> of a connection
> on S1 send a request if it's network was specified in that
> routers RIP
> process causing the local router to send an update out the
> S1 interface? If
> anyone knows or can point me to the appropriate place for
> the information
> I'd appreciate it.
>
> --
> James Haynes
> Network Architect
> Cendant IT
> A+,MCSE,CCNA,CCDA,CCNP,CCDP
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