RE: IEExpert Vol 2 version 4.1 task 4.4

LOL. Now I feel silly (I didn't even notice it was a Serial interface when I
read it on my iPhone). Note to self, don't post solutions in the wee hours
of the morning.

Cheers,

Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP

Sr. Technical Instructor - IPexpert, Inc.

Telephone: +1.810.326.1444

Fax: +1.810.454.0130

Mailto: <mailto:jscrivener_at_ipexpert.com> jscrivener_at_ipexpert.com

From: Scott Morris [mailto:smorris_at_internetworkexpert.com]
Sent: Wednesday, 6 May 2009 3:55 AM
To: Jared Scrivener
Cc: kaniyath minha; Cisco certification
Subject: Re: IEExpert Vol 2 version 4.1 task 4.4

While the switch/vlan idea is a good one to think about, in this case it
would be a touch more difficult since that's a Serial interface. ;)

Along that same line of thinking though, check out your configuration on the
serial interface. Notice that the IP address (54.1.10.x vs. 54.1.2.x) is
different. Do you have a misconfiguration? While the backbone routers are
set per rack as having different address ranges, for the simplicity of
students we have the ability of loading different racks' configurations (so
you can work on previously saved labs even though your rack number has
changed).

Peering to the backbone router, there are numerous configurations to support
multiple labs. Are you learning that address over a different PVC (it's
frame?) on that interface?

As Jared mentioned, some show commands would be a good place to start in
order to track down where that address is coming from and why.

HTH,

Scott Morris, CCIEx4 (R&S/ISP-Dial/Security/Service Provider) #4713,

JNCIE-M #153, JNCIS-ER, CISSP, et al.

JNCI-M, JNCI-ER

smorris_at_internetworkexpert.com

Internetwork Expert, Inc.

http://www.InternetworkExpert.com

Toll Free: 877-224-8987

Outside US: 775-826-4344

Knowledge is power.

Power corrupts.

Study hard and be Eeeeviiiil......

Jared Scrivener wrote:

I'm guessing at the lab topology, but can you provide a "sh run int" for the
interface on both neighbors? This normally occurs when using secondary
addresses if the primary network doesn't match on both ends. Your output
would indicate either that, or a misconfigured IP addressing.

Alternatively, you may have misconfigured a switch so that a neighbor (you
shouldn't expect to see) appears to be in the same VLAN as R6. This could be
a misconfigured access port, or if you are lucky (because it is cooler) you
may have managed to VLAN hop (by mismatching native VLANs, connecting a
trunk to an access port that doesn't match the native or running QinQ
tunnels that use overlapping tags between the inside tag range and the
outside tag and then fed the outside tag into an access port with the same
tag).

Oh, could you explain what you meant by "sh ip eigrp neighbor" is ok? I'd
like to see the output. If it really is OK, my last solution is probably
right. If not, one of the first two probably is.

Cheers,

Jared

On May 6, 2009, at 12:32 AM, kaniyath minha
<mailto:minha.kaniyath_at_gmail.com> <minha.kaniyath_at_gmail.com> wrote:

Dear

I configured straight forward configuration of EIGRP on R6

router eigrp 10
network 54.1.2.6 0.0.0.0

But i am getting an error on my R6 like

*Mar 2 02:18:26.565: IP-EIGRP(Default-IP-Routing-Table:10): Neighbor
54.1.10.254 not on common subnet for Serial0/0.

Show ip eigrp neighbor is ok.

Please help me to solve this issue.

Thanks and Regards

Kajaleel

Blogs and organic groups at http://www.ccie.net
Received on Wed May 06 2009 - 10:02:09 ART