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CDP question

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Marcus J
Frequent Advisor

CDP question

Hi!

CDP is now set to read only mode on all HP switches!
why can i still see all my connected hp devices using sh cdp?
5 REPLIES
Mohieddin Kharnoub
Honored Contributor

Re: CDP question

Hi

This is helpful for you :
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1164650

Good Luck !!!
Science for Everyone
Marcus J
Frequent Advisor

Re: CDP question

"LLDP packets are used to populate the CDP neighbour information. I think it's sending LLDP and is transparent to CDP"

is this what you are referring to?
does lldp update cdp info in hp switches?
Mohieddin Kharnoub
Honored Contributor

Re: CDP question

Hi

By default the switche have CDP enabled on each port.
This is a read-only capability, meaning that the switch can receive and store information about adjacent CDP devices but does not generate CDP packets.

More info:
http://cdn.procurve.com/training/Manuals/3500-5400-6200-8200-MCG-Jan08-14-NetMgmt.pdf

Good Luck !!!
Science for Everyone
Marcus J
Frequent Advisor

Re: CDP question

all my hp switches are updated to the latest firmware.
we have 2500, 2600 & 5300 series installed.
I can still see all of them using CDP.
That should'nt be possible if they didnt send CDP info, right?

So my question is -how can i see all my switches using "sh cdp" if hp's does'nt send cdp's?
Matt Hobbs
Honored Contributor
Solution

Re: CDP question

There is a single neighbour database on the switch. If either CDP or LLDP packets are received, it will populate this database and using both 'show cdp' or 'show lldp' will show you the same information.