Show cdp ne detail

Unanswered Question
Jan 7th, 2009

Show cdp ne detail (output)

Below output is from a 3560 switch with L2 dot1q trunk link to the core 6509 switch. Why is there no management address under(last line)? This is happening on all edge switches(3560 & 3750)

Device ID: ABC

Entry address(es):

IP address:

Platform: cisco WS-C6509-E, Capabilities: Router Switch IGMP

Interface: GigabitEthernet0/2, Port ID (outgoing port): GigabitEthernet3/1

Holdtime : 168 sec

Version :

Cisco Internetwork Operating System Software

IOS (tm) s3223_rp Software (s3223_rp-IPBASEK9_WAN-VM), Version 12.2(18)SXF10, RE


Technical Support:

Copyright (c) 1986-2007 by cisco Systems, Inc.

Compiled Fri 13-Jul-07 05:11 by kellythw

advertisement version: 2

VTP Management Domain: 'ABC'

Native VLAN: 144

Duplex: full

Management address(es):

I have this problem too.
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royalblues Wed, 01/07/2009 - 06:08

You might be experiencing a cosmetic bug .

Try rebooting one switch and check whether it resolves the issue


mikegrous Wed, 01/07/2009 - 06:13

If that doesnt work try this.

CDP Source-Interface on all your switches. The source interface being the int that has the IP you want to show up.

cdp ?

source-interface Insert the interface's IP in all CDP packets

colmgrier Wed, 01/07/2009 - 06:51

Thanks for replies.

cdp source-interface command not supported on the 3560 & 3750 switches.

The 3560 & 3750 switches are running different ios ver so this would rule out bug??

Note:min number of vlan allowed on each trunk link, vlan1 is shutdown, also VTP pruning is also enabled.

Giuseppe Larosa Wed, 01/07/2009 - 10:47

Hello Colm,

but the following info

Device ID: ABC

Entry address(es):

IP address:

Platform: cisco WS-C6509-E

is correct ?

CDP is a layer 2 protocol it should provide you the IP address of the interface you connect to or the the SVI of vlan144 ip address.

the absence of the management address can be the result of the multilayer nature of the c6509 that has multiple ip addresses in different subnets.

the management address can be a field that is filled by l2 switch where is clear what the management address is (there's only one)

But I see that in one campus

Device ID: XXXX

Entry address(es):

IP address:

Platform: cisco WS-C6506-E, Capabilities: Router Switch IGMP

Interface: TenGigabitEthernet1/1, Port ID (outgoing port): TenGigabitEthernet4/3

Holdtime : 170 sec

Version :

Cisco IOS Software, s72033_rp Software (s72033_rp-ADVIPSERVICESK9_WAN-M), Version 12.2(33)SXH2, RELEASE SOFTWARE (fc1)

Technical Support:

Copyright (c) 1986-2008 by Cisco Systems, Inc.

Compiled Sat 29-Mar-08 13:27 by prod_rel_team

advertisement version: 2

VTP Management Domain: 'pal.A'

Native VLAN: 1

Duplex: full

Management address(es):

IP address:

Well there is the management ip address

Is your 6500 switch a VTP server or client ?

may be the field is only for VTP server

In my case it is so may be the meaning is that


I've verified that a l2 switch even if vtp client shows the mgmt address as seen by neighbor.

Hope to help


colmgrier Wed, 01/07/2009 - 16:30

Thanks Giuseppe for your response.

The 6509 core switches are the VTP servers and have multiple L3 SVI's.

Edge switches are in VTP client mode.

VLAN 1 shutdown on all campus switches.

Native VLAN 144 used for all dot1q trunk links.

All Trunk link are VTP pruned and VLAN blocking on trunk links.

Additional info: On another customer network when using VLAN 1 for the management SVI on all campus switches, the management address is present.


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