CDP and LLDP

Unanswered Question

Hi I connected ME 3400 directly with Catalyst 3750 metro switch.I enabled CDP and lldp.when i given sh cdp nei its not showing neighboring device.similarly for sh lldp neighbors also the same.In these switches cdp / lldp not supporting under interface.Allowing only from global config mode.Please help to solve this issue

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Giuseppe Larosa Fri, 05/15/2009 - 07:48
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Hello K.G. Pramod,


two notes:

1)I would try with only one protocol enabled at the global level.

Both protocols do the same job so it makes sense to use only one


to disable CDP on an interface

int type x/y

no cdp enable



2)

For LLDP depending on IOS version used there are some SW defects.

For LLDP to work well you need to use recent IOS versions like 12.2(46)SE or above

Among possible workarounds the assignment of an ip address in the client vlan on the SVI has been reported.


Hope to help

Giuseppe




yes i disabled cdp for entire router and enabled lldp from global config mode. on interface level ME 3400 not supporting lldp even though i use the same ios you specified.can to please help.should i change my switch to client mode ? but in cisco document says we can enable on interface level as well as globally. but on my real metro switch i didnt find this option.

yes i disabled cdp for entire router and enabled lldp from global config mode. on interface level ME 3400 not supporting lldp even though i use the same ios you specified.can to please help.should i change my switch to client mode ? but in cisco document says we can enable on interface level as well as globally. but on my real metro switch i didnt find this option.

Hi Giuseppe,

After my investigation i came to know frames are dropped.

Switch#sh lldp traffic


LLDP traffic statistics:

Total frames out: 0

Total entries aged: 0

Total frames in: 93

Total frames received in error: 0

Total frames discarded: 93

Total TLVs unrecognized: 0

and lldp interface status is


Switch#sh lldp interface


FastEthernet0/1:

Tx: enabled

Rx: enabled

Tx state: INIT

Rx state: INIT

How to fix the issue?Thanks in advance


Giuseppe Larosa Sun, 05/17/2009 - 22:47
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Hello Pramod,

if the switch would support control plane policing I would think to check it.


Edit:

But it doesn't support it.

try to configure some LLDP param:

like

Switch# configure terminal


Switch(config)# lldp holdtime 120


Switch(config)# lldp reinit 2


Switch(config)# lldp timer 30


Switch(config)# end


see

http://www.cisco.com/en/US/docs/switches/metro/catalyst3750m/software/release/12.2_46_se/configuration/guide/swlldp.html#wp1040949




Hope to help

Giuseppe


Giuseppe Larosa Fri, 05/22/2009 - 12:49
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Hello Pramod,

kind of you to report you have solved thid issue this can help other people facing the same problem.

If I have correctly understood you added an lldp command under the interface and this solved.


Best Regards

Giuseppe


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