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New Contributor
Posts: 3
Registered: ‎07-25-2014
Accepted Solution

Primary-port with MLXe LAG

Hi...

 

Is the whole LAG supposed to go down if the primary-port goes down ?

 

Thanks...

 

VytoG

Contributor
Posts: 69
Registered: ‎10-14-2011

Re: Primary-port with MLXe LAG

No, not normally it will just be running on one link. You could have some other issue like another link in the same remote vlan and spanning-tree has brought that interface down because its a higher cost than some other bonded link? I have a similar environment with multiple lags and also use spanning-tree as a "last ditch effort" to keep connectivity between environments only after all the lags have failed! Works great.
New Contributor
Posts: 3
Registered: ‎07-25-2014

Re: Primary-port with MLXe LAG

Thanks for the response.

 

This may have been a "duh" moment on our part. We disabled the primary-port to see whether the LAG would failover to the remaining port, but then realized disabling the primary-port would probably also disable the rest of the ports in the LAG.

 

However, how does one disable the primary-port in software if it needs to be removed from the LAG temporarily due to interface errors, for example, short of physically having to disconnect the cabling ?

 

Apologies for the ignorance, but we are basically a Cisco shop and used to the Cisco LAG method of having a separate virtual port-channel interface.

 

Thanks...

Brocadian
Posts: 152
Registered: ‎10-05-2010

Re: Primary-port with MLXe LAG

If you disable the primary port (for example 1/6) while in the interface level, it will tear down the whole LAG from the box. It will create an outage.

(config-if-e1000-1/6)# disable

The best way to disable the primary port in the LAG is to go into the LAG config, and disable the primary port.

(config)# lag  "LAG-Name"
(config-lag-LAG-Name)# disable E 1/6

New Contributor
Posts: 3
Registered: ‎07-25-2014

Re: Primary-port with MLXe LAG

Thanks for the reply. I wish the documentation would explain this.

Brocadian
Posts: 152
Registered: ‎10-05-2010

Re: Primary-port with MLXe LAG

Glad to help.

 

Thanks,

 

Sharan

Systems Engineer, Brocade

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