From: ccie2be (ccie2be@nyc.rr.com)
Date: Tue May 24 2005 - 11:04:51 GMT-3
Hi Bajo,
Thanks for chiming in on this thread.
However, my testing doesn't confirm what you said.
I changed my config in the following ways:
1. I disabled split-horizon on e0/0
2. I enabled rip auto-summary
Here are my config's on R1:
router rip
version 2
passive-interface default
no passive-interface Ethernet0/0
no passive-interface Ethernet0/1
network 190.7.0.0
network 192.10.7.0
interface Ethernet0/0
ip address 192.10.7.3 255.255.255.0
ip rip authentication mode md5
ip rip authentication key-chain RIP
no ip split-horizon
ip summary-address rip 0.0.0.0 0.0.0.0
Given the above, I expected the neighboring rip routers on E0/0 segment to
have a default route, but, in fact, they don't.
R1's debug shows it is still tagging route 0.0.0.0 with a metric of 16.
*Mar 1 21:52:53.179: RIP: build update entries
*Mar 1 21:52:53.179: 0.0.0.0/0 via 0.0.0.0, metric 16, tag 0 <=========
*Mar 1 21:52:53.179: 190.7.34.0/24 via 0.0.0.0, metric 1, tag 0
*Mar 1 21:52:53.179: 190.7.34.4/32 via 0.0.0.0, metric 1, tag 0t0/0
*Mar 1 21:52:20.866: RIP: sending update with long TTL <==========
Notice the metric of 16 in the first entry and the "long TTL" in the last
entry.
Any idea what that "long TTL" reference is talking about and why it's there?
Unless I didn't completely understand your post, my result don't confirm
your info.
Any thoughts?
Tim
-----Original Message-----
From: Bajo [mailto:bajoalex@gmail.com]
Sent: Tuesday, May 24, 2005 9:41 AM
To: ccie2be
Cc: Dave Bregman; B Kim; John Matus; ccielab@groupstudy.com
Subject: Re: rip default route vs summary 0.0.0.0 0.0.0.0
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120
t/120t7/sumadr.htm
Restrictions
Autosummary will override the configured summary-address feature on a
given interface except when both of the following are true:
The configured interface summary-address and the IP address of the
configured interface share the same major net (the classful,
nonsubnetted portion of the IP address).
Split horizon is not enabled on the interface.
If split horizon is enabled, neither an autosummary address nor the
interface summary-address is advertised.
For example, in the following example configuration, the major net is
10.0.0.0. The 10 in the address defines a Class A address space,
allowing space for 0.x.x.x unique hosts where x defines unique bit
positions in the addresses for these hosts. The summary of the major
net defines the prefix as implied by the class (A, B, or C) of the
address, without any net mask.
In the following example, the summary address 10.2.0.0 overrides the
autosummary address of 10.0.0.0, 10.2.0.0 is advertised out interface
E1, and 10.0.0.0 is not advertised.
int E1
ip address 10.1.1.1 255.255.255.0
ip summary-address rip 10.2.0.0 255.255.0.0
no ip split-horizon
router rip
network 10.0.0.0
On 5/24/05, ccie2be <ccie2be@nyc.rr.com> wrote:
> Hi guys,
>
> I've been playing around with this myself.
>
> Here's the situation.
>
> I have 3 rip routers all connected by an ethernet segment.
>
> R1's is connected to this ethernet segment via its e0/0 interface.
>
> I want R1 to advertise a default route out its e0/0 interface but not any
> other rip enabled interfaces.
>
> This is R1's int e0/0 config:
>
> interface Ethernet0/0
> ip address 192.10.7.3 255.255.255.0
> ip rip authentication mode md5
> ip rip authentication key-chain RIP
> ip summary-address rip 0.0.0.0 0.0.0.0
>
> This default route wasn't showing up in the route tables on the other
rtr's
> on the segment, so I enabled debug ip rip on R1.
>
> *Mar 1 20:54:36.242: RIP: sending v2 update to 224.0.0.9 via Ethernet0/0
> (192.1
> 0.7.3)
> *Mar 1 20:54:36.242: RIP: build update entries
> *Mar 1 20:54:36.242: 0.0.0.0/0 via 0.0.0.0, metric 16, tag 0
>
> Notice the metric 16 on the line above.
>
> OK, so that's why the default route isn't showing up on the other routers.
>
> But, the question is this: Why is R1 tagging this route with a metric of
> 16?
>
> This is further confirmed by this debug output from another router on this
> segment:
>
> 20:59:19: RIP: received v2 update from 192.10.7.3 on Vlan32
> 20:59:19: 0.0.0.0/0 via 0.0.0.0 in 16 hops (inaccessible)
>
> Another question is this: What method, if any, exists to make this
default
> summary route have a lower hop count?
>
> I know I haven't solved the problem, but, hopefully I've added clarity to
> the issue.
>
> Tim
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dave
> Bregman
> Sent: Tuesday, May 24, 2005 4:10 AM
> To: B Kim; John Matus; ccielab@groupstudy.com
> Subject: RE: rip default route
>
> I seem to remember reading somewhere that the 'ip summary-address rip'
> command only works if you disable split-horizon on the interface also.
> Regardless if it's a multipoint interface or not. I'm not sure why you
> would have to though. I've seen sample labs that ask you to send a RIP
> default route to a specific router and not use the 'default-information
> originate' command. My guess is that it would be good to know this for
> the test.
>
> Dave Bregman
> CCIE #14626
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of B Kim
> > Sent: Monday, May 23, 2005 7:33 PM
> > To: 'John Matus'; ccielab@groupstudy.com
> > Subject: RE: rip default route
> >
> >
> > John
> >
> > I tried it on my lab. It doesn't seem to work.
> > I haven't seen this case in any workbooks so far.
> >
> > You may already know that, the best way to originate the default route
> > in RIP is configuring "default-information originate" with filtering
> > such as distribute-list out.
> >
> > Beomsu Kim
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of
> > John Matus
> > Sent: Monday, May 23, 2005 8:05 PM
> > To: ccielab@groupstudy.com
> > Subject: rip default route
> >
> > can you inject a rip default route out an interface with:
> >
> > ip summary-address rip 0.0.0.0 0.0.0.0 ?
> >
> > i know you can do it w/ eigrp but i'm not sure about rip. i
> > labbed them
> >
> > both and got no results...
> >
> > TIA.
> >
> > _________________________________________________________________
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-- Kind Regards,Bajo
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