From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Thu Dec 07 2006 - 16:36:34 ART
When an EIGRP hello packet is received the router will check the source
IP address of the hello packet. If the source IP address of the EIGRP
hello packet received isn't on the same subnet as the receiving router's
interface then the router will generate the error message you are
seeing. You should check all of the other routers in your network that
have EIGRP enabled to see if they are perhaps sending the EIGRP hellos
to the router is question. Also check the backbone routers that have
EIGRP enabled.
Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
________________________________
From: James Ko [mailto:bacchus21@gmail.com]
Sent: Thursday, December 07, 2006 9:40 AM
To: Brian Dennis
Cc: ccielab@groupstudy.com
Subject: Re: Not on common subnet in EIGRP
Hello, Brian.
Thank you so much for your reply and advice.
According to your message, it seems to me that this error message is
more related with EIGRP hello, not subnet problem.
What's the difference between hellos being received across a LAN and
hellos being received across a LAN ?
Is it alright if I get back to you when I get more detailed information?
Thanks in advance!!
2006/12/8, Brian Dennis <bdennis@internetworkexpert.com>:
Are the EIGRP hellos being received across a LAN or WAN interface? If
it's a WAN interface then you may have a remote router with a L3 to L2
mapping to the router in question that is sending the EIGRP hellos. If
it's a LAN interface then possibly another router with EIGRP enabled is
in the same VLAN.
When trying to solve this issue you should look at all routers with any
"possible" connection to the router in question.
HTH,
Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
James Ko
Sent: Thursday, December 07, 2006 7:43 AM
To: ccielab@groupstudy.com
Subject: Not on common subnet in EIGRP
Hello, all.
Does anyone know about 'Not on common subnet' in EIGRP?
I know if an EIGRP neighbor is located in different subnet, the message
will
appear.
But, I can't find any configuration mistakes. Is there any other
possibilities causing the message?
One piece of advice will save me a lot.
Thanks in advance!!
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