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CDP

CDP

(OP)
Hello there,

I had a question regarding CDP. I was trying to draw a diagram for my network, when the following problem occurs.

When using "show cdp neighbor" command on my primary core switch i see the proper name and interface # of the attached secondary core switch. However, upon using the "show cdp neigh fa1/1 detail" command (fa1/1 is the port i get that is attached directly to the secondary core switch and is the correct int that is connected to it) i get the wrong ip!!! The ip it gives me is not that of the secondary core switch but is that of the asa firewall!! When i go on the secondary core switch and do the same thing i get the same result but it gives me the ip of the 2nd asa firewall instead.

Notes: I am logged in to the management vlan. Firewall vlan is separate as well. asa is also connected to the switches but on different ports.


Why is cdp giving me the wrong ip address?

RE: CDP

Hi,

Take a closer look at the output of your show cdp nei detail and compare it with the output of your show cdp nei fa1/1 detail, you should be able to see the device ID and check what type of device is claiming to have the ip address of your asa.
Also, I don't think the asa will send cdp to your switch by default.

-Viconsul

RE: CDP

some out put sample case on 6509

___________________________________________________________________________
Port (Our Port): 3/4
Device-ID: sgdcSL5-4506.sgdc.chevrontexaco.net
Device Addresses:
IP Address: 123.55.193.4
Holdtime: 176 sec
Capabilities: ROUTER SWITCH IGMP
Version:
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-IPBASE-M), Version 12.2(31)SGA1, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Fri 26-Jan-07 14:41 by kellythw
Platform: cisco WS-C4506
Port-ID (Port on Neighbors's Device): GigabitEthernet1/1
VTP Management Domain: sgdc
Native VLAN: 1
Duplex: full
System Name: unknown
System Object ID: unknown
Management Addresses:
IP Address: 123.55.193.4
Physical Location: unknown
___________________________________________________________________________
Port (Our Port): 3/5
Device-ID: sgdcSL4-4506.sgdc.chevrontexaco.net
Device Addresses:
IP Address: 123.55.192.4
Holdtime: 140 sec
Capabilities: ROUTER SWITCH IGMP
Version:
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-IPBASEK9-M), Version 12.2(31)SGA, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Fri 08-Sep-06 10:19 by ccai
Platform: cisco WS-C4506
Port-ID (Port on Neighbors's Device): GigabitEthernet1/2
VTP Management Domain: sgdc
Native VLAN: 1
Duplex: full
System Name: unknown
System Object ID: unknown
Management Addresses:
IP Address: 123.55.192.4
Physical Location: unknown
___________________________________________________________________________
Port (Our Port): 3/6
Device-ID: sgdcSL4-4506.sgdc.chevrontexaco.net
Device Addresses:
IP Address: 123.55.192.4
Holdtime: 133 sec
Capabilities: ROUTER SWITCH IGMP
Version:
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-IPBASEK9-M), Version 12.2(31)SGA, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Fri 08-Sep-06 10:19 by ccai
Platform: cisco WS-C4506
Port-ID (Port on Neighbors's Device): GigabitEthernet1/1
VTP Management Domain: sgdc
Native VLAN: 1
Duplex: full
System Name: unknown
System Object ID: unknown
Management Addresses:
IP Address: 123.55.192.4
Physical Location: unknown
___________________________________________________________________________

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