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Silver

Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

According to the following Cisco webpage, cross-stack 10-Gigabit EtherChannel is possible on the 3750 with up to two 10-Gigabit modules, using LACP: http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00806cb982.shtmlhttp://

However, the webpage doesn't confirm if this functionality is restricted to a particular 3750 model, such as 3750E, or if it applies to all models. It also doesn't specify any particular IOS feature set. I've tried Cisco Software Advisor but it doesn't list this feature on either the 3750E or 3750-X. Can anyone help?

Next question, does anyone know if this is possible on the 2960-S switches (i.e. cross-stack 10gig EtherChannel)?

  • LAN Switching and Routing
1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

Ref the 2960-S pushing 10Gbps, it has a forwarding bandwidth of 88Gbps (half duplex), so do you mean the FlexStack technology for linking them?

The FlexStack can push 10 Gbps, full duplex.  SO you if have, say three 10 Gbps links then the other two would be beneficial if you consider it as a backup link only.  If you plan to use it to aggregate the links to push >10Gbps data down then it's a waste of money.

23 REPLIES
Bronze

Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

Once a stack is created, both sides only "see" one switch, so Cross-Stacking doesn't require any additional configuration.  If your switch supports PAgP or LACP, you should be good to go.

Silver

Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

Thanks Johnny.

Pretty sure PAgP doesn't support the 'cross-stack' element though, unless Cisco has added it recently.

Bronze

Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

Yes, looks like it.  I do not know why LACP and PAgP would be different to stacking, but that's what the doc says:

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00806cb982.shtml#lacp

Silver

Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

Since confirmed via Cisco webpage that the 2960-S can do cross-stack EtherChannel, but it doesn't say if it can do 10-Gigabit EtherChannel, or just 1Gbps.

Still can't find out if the model or feature set is important on the 3750 product.

Silver

Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

Our Cisco distribution partner has confirmed that cross-stack 10-Gigabit EtherChannel is compatible with 3750E, 3750-X and 2960-S. They said it is not dependant upon the IOS feature set, so IP Base (3750) and LAN Base (2960-S) will both work fine.

Hall of Fame Super Gold

Re: Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

Confirm that you can configure Etherchannel on multiple 1Gbps OR 10 Gbps links from a stacked 2960S to a stacked 3750E/3750X.  IOS version or feature set not important.

Whether or not a stacked 2960S can push 10Gbps or not is another question. 

Silver

Re: Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

Thanks leolaohoo.

Ref the 2960-S pushing 10Gbps, it has a forwarding bandwidth of 88Gbps (half duplex), so do you mean the FlexStack technology for linking them?

If so, the FlexStack data sheet says they can push 10Gbps and another 10Gbps in the opposite direction. I guess I need to get my head around the FlexStack data flow, but any tips/hints are very welcome ;o)

Hall of Fame Super Gold

Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

Ref the 2960-S pushing 10Gbps, it has a forwarding bandwidth of 88Gbps (half duplex), so do you mean the FlexStack technology for linking them?

The FlexStack can push 10 Gbps, full duplex.  SO you if have, say three 10 Gbps links then the other two would be beneficial if you consider it as a backup link only.  If you plan to use it to aggregate the links to push >10Gbps data down then it's a waste of money.

Silver

Cross-Stack 10-Gigabit EtherChannel on 3750E/3750-X/2960-S

OK, thanks.

I thought maybe a 2975 would do instead of the 2960-S, but no 10Gbps connectivity looking at the data sheet.

More 3750s then!

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