12-10-2008 10:10 AM - edited 03-06-2019 02:54 AM
Has any one ever seen the output of the show CDP neighbor detail command provide the wrong IP?
I am investigating an issue where the results of the command provide the wrong IP.
I am using a 3400 which connects back to a 3750. When issuing the command on the 3400, I see the wrong IP for the 3750.
If I issue the command on the 3750, the correct IP is shown for the 3400. There is only one management IP on the 3750; however, it is possible that another IP might have been on it in the past.
I have also attempted to clear the cdp table on the 3400.
Any help would be greatly appreciated.
Thanks.
12-10-2008 10:45 AM
Expected behavior is to use the lowest Vlan IP address, can you post the output from typing show ip interface brief on the switch?
Even if the Vlan is in shutdown mode, it will use that IP.
__
Edison.
12-10-2008 11:05 AM
Thanks so much for your help. Here is the output from a show ip int brief on the 3750:
3750#sh ip int bri
Interface IP-Address OK? Method Status Protocol
Vlan1 unassigned YES NVRAM administratively down down
Vlan99 10.62.147.186 YES manual up up
FastEthernet1/0/1 unassigned YES unset up up
FastEthernet1/0/2 unassigned YES unset up up
FastEthernet1/0/3 unassigned YES unset administratively down down
FastEthernet1/0/4 unassigned YES unset administratively down down
FastEthernet1/0/5 unassigned YES unset administratively down down
FastEthernet1/0/6 unassigned YES unset administratively down down
FastEthernet1/0/7 unassigned YES unset administratively down down
FastEthernet1/0/8 unassigned YES unset administratively down down
FastEthernet1/0/9 unassigned YES unset administratively down down
FastEthernet1/0/10 unassigned YES unset administratively down down
FastEthernet1/0/11 unassigned YES unset administratively down down
FastEthernet1/0/12 unassigned YES unset administratively down down
FastEthernet1/0/13 unassigned YES unset administratively down down
FastEthernet1/0/14 unassigned YES unset administratively down down
FastEthernet1/0/15 unassigned YES unset administratively down down
FastEthernet1/0/16 unassigned YES unset administratively down down
FastEthernet1/0/17 unassigned YES unset administratively down down
FastEthernet1/0/18 unassigned YES unset administratively down down
FastEthernet1/0/19 unassigned YES unset administratively down down
FastEthernet1/0/20 unassigned YES unset administratively down down
FastEthernet1/0/21 unassigned YES unset administratively down down
FastEthernet1/0/22 unassigned YES unset administratively down down
FastEthernet1/0/23 unassigned YES unset up up
FastEthernet1/0/24 unassigned YES unset up up
GigabitEthernet1/0/1 unassigned YES unset up up
GigabitEthernet1/0/2 unassigned YES unset up up
GigabitEthernet1/1/1 unassigned YES unset administratively down down
GigabitEthernet1/1/2 unassigned YES unset administratively down down
We use vlan 99 for management.
Here is the sh cdp neigh det on the interface that connects to fa 1/0/2 on the 3750. (Names edited for security purposes.)
Notice that the IP provided is not listed on the 3750. Weird...
3400#sh cdp neigh fa 0/24 det
-------------------------
Device ID: 3750
Entry address(es):
IP address: 10.62.144.38
Platform: cisco ME-C3750-24TE, Capabilities: Router Switch IGMP
Interface: FastEthernet0/24, Port ID (outgoing port): FastEthernet1/0/2
Holdtime : 146 sec
Version :
Cisco IOS Software, C3750ME Software (C3750ME-I5-M), Version 12.2(25)EY4, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Sat 13-May-06 06:42 by yenanh
advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=00000000FFFFFFFF010221FF000000000000001955B7AD00FF0000
VTP Management Domain: 'Domain'
Native VLAN: 51
Duplex: full
Management address(es):
IP address: 10.62.144.38
12-10-2008 11:15 AM
Was that IP configured on this switch and removed but not rebooted?
If so, give it a reboot. You may be experiencing a cosmetic bug.
__
Edison.
12-10-2008 11:31 AM
Will do. Thanks for your help.
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: