[nsp] IP-EIGRP: Neighbor A.B.C.D not on common subnet...
thomas.renzy at veritas.com
Mon Jan 27 17:02:09 EST 2003
I have never seen an EIGRP hello relayed from a router, nor have I ever
configured it. Would it be possible to see a copy of the EIGRP
configurations to see what is configured?
IS&T Global Network Services
"Some people drink from the fountain of knowledge, others just gargle." -
Author Robert Anthony
From: Yuval Ben-Ari [mailto:yuvalba at netvision.net.il]
Sent: Monday, January 27, 2003 7:07 AM
To: Thomas Renzy; cisco-nsp at puck.nether.net
Subject: RE: [nsp] IP-EIGRP: Neighbor A.B.C.D not on common subnet...
Not sure I understand your question,
the complaining router has 2 intefaces to 2 different segements.
the router sending the hello packet has single interface to another
segment (not one of the above 2).
all the 3 segments has a common router connected to it (core router)
I suspect the router is relaying the hello, is it possible ?
Were you able to eliminate the problem in your case ?
I found this doc: http://www.cisco.com/warp/public/103/15.html
but it does not explain how I see the hello from a router on different
> -----Original Message-----
> From: Thomas Renzy [mailto:thomas.renzy at veritas.com]
> Sent: Monday, January 27, 2003 12:01 AM
> To: Yuval Ben-Ari; cisco-nsp at puck.nether.net
> Subject: RE: [nsp] IP-EIGRP: Neighbor A.B.C.D not on common subnet...
> Do you have an EIGRP neighbor on this segment with a
> secondary interface
> configured? I've seen this type of message when, on an
> Ethernet segment, an
> EIGRP neighbor has a secondary interface configured on one
> router, but not
> on another router on the same Ethernet segment.
> EIGRP hello packets have a TTL of 2, so I don't think it
> traverse the next
> Thomas Renzy
> IS&T Global Network Services
> VERITAS Software
> Office: +650-527-4734
> Mobile: +650-996-7048
> Fax: +650-527-2034
> "Some people drink from the fountain of knowledge, others
> just gargle." -
> Author Robert Anthony
> -----Original Message-----
> From: Yuval Ben-Ari [mailto:yuvalba at netvision.net.il]
> Sent: Sunday, January 26, 2003 3:11 AM
> To: cisco-nsp at puck.nether.net
> Subject: [nsp] IP-EIGRP: Neighbor A.B.C.D not on common subnet...
> I noticed messages of the above kind while logging to a router and
> issuing 'term mon':
> Jan 26 13:01:59.566 IST: IP-EIGRP(Default-IP-Routing-Table:1680):
> Neighbor A.B.C.D not on common subnet for FastEthernet0/0
> Obviously the message means the router is seeing EIGRP hello packets
> coming on the interface from a neighbor which is not on that
> subnet, which happens to be correct.
> However I have no idea how these packets get to the interface as it is
> not on the same L2 segment (different VLAN).
> The error is only reported on terminal and not on all routers
> (seems to
> be IOS dependent + 'eigrp log-neighbor-warnings' command)
> Is it possible the hello packet is transiting a L3 device ?
> Will be happy to hear your ideas.
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