Cdp output with no ip address

Unanswered Question
Oct 31st, 2007
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Hello guys,

new your advice on below cdp output:

DistSwi#sh cdp nei g9/22 det


Device ID: routerA

Entry address(es):

IP address: >>>>>>>>>>>>>>>>>

Platform: Cisco CSS11503 Series Content Services , Capabilities: Router Trans-Bridge Switch

Interface: GigabitEthernet9/22, Port ID (outgoing port): Eth-Mgmt

Holdtime : 163 sec

Version :


TAC Support:

Copyright (c) 1986-2002 by Cisco Systems, Inc.

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DistSwi#sh cdp nei

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID


Gig 9/22 137 R T S Cisco CSS1Eth-Mgmt

6509 Swi

Gig 3/47 123 T S I WS-C6509 3/20

SwiB Gig 7/1 170 R S I WS-C6513 Gig 7/1

SwiC Gig 7/2 178 R S I WS-C6513 Gig 7/2


Is this a valid cdp output?

Sh cdp nei det not showing ip address of the connected router.

I cant login to the connected router via telnet since no ip address appeared.

Waiting for the explanation.



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lgijssel Wed, 10/31/2007 - 23:37
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This is what you see when the listed device has no ip adress, for example an unconfigured switch.

If the device ever did have an ip, this seems to be gone now. Alternatively, check your docs and try the ip adress that is listed there altough I do not give you much of a chance, cdp hardly ever lies.



Kevin Dorrell Thu, 11/01/2007 - 04:12
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My guess is that the router is trying to get an IP address by DHCP and there is no DHCP server onm your network.

Kevin Dorrell



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