Comments on: Cisco 3750 – EIGRP not on common subnet problen http://itknowledgeexchange.techtarget.com/itanswers/cisco-3750-eigrp-not-on-common-subnet-problen/ Sat, 18 May 2013 07:52:31 +0000 hourly 1 By: snapper70 http://itknowledgeexchange.techtarget.com/itanswers/cisco-3750-eigrp-not-on-common-subnet-problen/#comment-92900 snapper70 Thu, 02 Jun 2011 20:33:36 +0000 #comment-92900 It’s almost like the switch is seeing the packet from 10.13.1.251 coming in on vlan 11; so one of your vlan11 ports has that device connected to it. Since it’s expecting to see it on vlan 1 and it’s NOT there, then it reports and error; and further explains why you can’t ping it; as the 3750 is expecting it on a port of vlan1 like you have it configured.

If it’s an unused subnet (?) then delete it from vlan 1, and place it as a secondary interface on vlan 11; OR take a PC with static address within the expected space for your VLAN 1, and connect it to a vlan 11 port. You will then be able to ping that device (and that device only !) and connect to it to change the address or discover what it really is.

PS – does a simple “SH CDP NEIGHbors detail” give you any clue?

]]> By: Networking Wrap-Up - Enterprise IT Watch Blog http://itknowledgeexchange.techtarget.com/itanswers/cisco-3750-eigrp-not-on-common-subnet-problen/#comment-92612 Networking Wrap-Up - Enterprise IT Watch Blog Wed, 25 May 2011 14:15:52 +0000 #comment-92612 [...] Cisco 3750 – EIGRP not on common subnet problem [...]

]]>