Re: HP NNMi Layer 2 connectivity (503 Views)
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Regular Advisor
Chetan_J
Posts: 173
Registered: ‎01-02-2013
Message 1 of 6 (575 Views)

HP NNMi Layer 2 connectivity

Hello Experts,

 

We are having HP NNMi 9.20 with latest patch 04 installed on Windows server 2008 R2.

 

We are facing issue in the Layer 2 connection.

 

When check the connectivity between the devices it shows that it is connected using the FDB topology source.

And We confirm with  the network team,  they mentioning that FDB was disabled before discovering the devices.

 

But still NNMi discover connectivity as FDB.

 

How we can correct this connectivity ?

 

 

Please suggest, if any have face this issue.

 

Regards,

Chetan

Honored Contributor
AndyKemp
Posts: 751
Registered: ‎05-17-2010
Message 2 of 6 (558 Views)

Re: HP NNMi Layer 2 connectivity

FDB isnt something one would enable or disable on a network device as normal operation.  The FDB fowarding database  table is used by a Layer 2 device (switch/bridge) to store the MAC addresses that have been learned and which ports that MAC address was learned on.

 

NNMi uses these tables to build the layer two connectivity between devices by cross referencing the tables at a per-device and per instance (for virtualized switching contexts).

 

If FDB were disabled on a switch , it would stop working.

Have a nice day :)

Andy Kemp,  CISSP
Regular Advisor
Chetan_J
Posts: 173
Registered: ‎01-02-2013
Message 3 of 6 (526 Views)

Re: HP NNMi Layer 2 connectivity

Hello AndyKemp,

 

Thanks for replying.

 

So, when FDB disabled on devices NNMi will not draw connectivity between devices. (Please confirm)

 

Regards,

Chetan

 

Valued Contributor
Vikramsingh_03
Posts: 43
Registered: ‎01-23-2013
Message 4 of 6 (503 Views)

Re: HP NNMi Layer 2 connectivity

Hi Chetan,

 

   No, there is a proper channel while creating L-2 views.

 

First, it uses FDB to create the L-2 Path views ( we can also disable it node group wise ). And then if not available, then uses other protocols such as XDP, CDP etc to create these views.

 

If there are no such protocols which is not the case anywhere, because NNMi just takes the Mac table from switches and uses that information.

 

There may be some case, where one interface of a switch uses XDP, and other interface for another connecting switch uses FDB, then you may say the wrong topoloy L-2 View on NNMi.

 

Regards,

Vikram

 

Please appreciate by hitting kudos.

Valued Contributor
Vikramsingh_03
Posts: 43
Registered: ‎01-23-2013
Message 5 of 6 (502 Views)

Re: HP NNMi Layer 2 connectivity

And yes, if no such protocols are running, then you can't see the L-2 Information on NNMi. You may see  the neighbourship devices only in NNMi.

 

Regards,

Vikram

 

Please appreciate by hitting kudos

Regular Advisor
Chetan_J
Posts: 173
Registered: ‎01-02-2013
Message 6 of 6 (483 Views)

Re: HP NNMi Layer 2 connectivity

Hello Vikram,

 

Thanks for information.

 

We just want confirm.

 

If Network team disabled these FDB/LLDP/CDP protocol, NNMi will not able to fetch Layer-2 connectivity details ?

 

Regards,

Chetan_J

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