802.3ad - LACP configuration on 6500

Answered Question
Mar 18th, 2010
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Hi all,


6513-1 & 2 connected via Etherchannel. New  backup server connected (dual NIC/Teaming) and it has the Team option: 802.3ad Dynamic with Fault Tolerance. Iam wondering if we enable  'LACP' passive on the 6500 interfaces (where the server NICs connecting), will it help speeding up the server backup jobs?  or LACP is just another way to channel 2 or more Switch ports  to another switch only?


IOS supports LACP (12.2). Also, can both Ethercannel and LACP config exists same time.?


*********************************************************************************


Config:


6513-1:


Int gig 4/1

description: SERVER NIC1

switchport

channel-protocol lacp

channel-group number mode passive  ---> Enable LACP only if a LACP device is detected



6513-2:


Int gig 4/1

description: SERVER NIC2

switchport

channel-protocol lacp

channel-group number mode passive  ---> Enable LACP only if a LACP device is detected



*******************************************************************************


Please suggest.


Thanks

MS

Correct Answer by Reza Sharifi about 7 years 6 days ago

Hi MS,


Yes, you should be fine with this config in the same switch.


HTH

Reza

Correct Answer by glen.grant about 7 years 6 days ago

Passive has no relation to speed , it is just to dynamically create the etherchannel .  Use Active on the switch end .

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Correct Answer
glen.grant Thu, 03/18/2010 - 13:38
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Passive has no relation to speed , it is just to dynamically create the etherchannel .  Use Active on the switch end .

mvsheik123 Fri, 03/19/2010 - 06:51
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Hi Glen,


Thank you for the reply. So..


1. Etherchannel and LACP configs can exists at same time.


2. With LACP - Even if the switch ports (where the server both NICs connects) exists on 2 different switches, it works (gives 2Gig speed to server). As I believe ether channel cannot in the same way (the ports need to be on the same sw)


3. So simple port configurations will automativally create the LACP PO# . I do not need to create any other admin keys etc.


Please suggest if that is correct.


Thank you

MS

Reza Sharifi Fri, 03/19/2010 - 07:21
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mvsheik123 wrote:


Hi Glen,


Thank you for the reply. So..


1. Etherchannel and LACP configs can exists at same time.


2. With LACP - Even if the switch ports (where the server both NICs connects) exists on 2 different switches, it works (gives 2Gig speed to server). As I believe ether channel cannot in the same way (the ports need to be on the same sw)


3. So simple port configurations will automativally create the LACP PO# . I do not need to create any other admin keys etc.


Please suggest if that is correct.


Thank you

MS


MS,


You are trying to use Multichassis EtherChannel (MEC).  In you case since the 6513s are not VSS your config will not work.  The 2 connections from the server need to go to the same switch or a VSS pair (6500) or a set of 3750s stacked.  Then you would do LACP/Active on the switch side and also the same on the server side. It actualy works well




HTH

Reza

mvsheik123 Fri, 03/19/2010 - 07:36
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Hi Reza,


Thank you for the reply and clarification. The 6513 are NOT in VSS mode. So If move the Server NICs to same chassis (diff mods), the below config would be suffice to get the 2gig speeds?


Config:


6513-1:


Int gig 4/1

description: SERVER NIC1

switchport

channel-protocol lacp

channel-group number mode active

!




Int gig 8/1

description: SERVER NIC2

switchport

channel-protocol lacp

channel-group number mode active


Thank you in advance.


MS

Correct Answer
Reza Sharifi Fri, 03/19/2010 - 07:44
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Hi MS,


Yes, you should be fine with this config in the same switch.


HTH

Reza

mvsheik123 Fri, 03/19/2010 - 07:52
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Sorry.. wanted to add full config for switch poerts..wnat to check if spanning tree portfast

makes difference. Please see below. Also, This specific to switchports, so should not have any impact on other servers in the same Vlan with

regular NIC teaming (2 switches). is that correct?




Int gig 4/1

description: SERVER NIC1

switchport

no ip address
switchport access vlan 120
switchport mode access
spanning-tree portfast
channel-protocol lacp

channel-group number mode active


Int gig 8/1

description: SERVER NIC2

switchport

no ip address
switchport access vlan 120
switchport mode access
spanning-tree portfast
channel-protocol lacp

channel-group number mode active



Thank you

MS

Reza Sharifi Fri, 03/19/2010 - 08:14
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Looks good.  Just make sure the sever side is also LACP.  There are multiple options Microsoft offers but LACP works really well.  I have not used it with port fast but that should not heard any thing.


Good Luck

Reza

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