3750 stacking

Unanswered Question
Feb 22nd, 2009

3750G - adv-IPService Image , will this be able to be stacked with IPB 3750G . If possible , should i buy 3 IPS Image or will i be able to use the IPS in the stack master ?

I have this problem too.
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Joseph W. Doherty Sun, 02/22/2009 - 17:07

From what I've read, the most advanced feature set should win a stack election and should be the image run by the entire stack. From other posts, also believe you want to insure the different feature images are all on the same version.

Do note, if there's only one advanced feature image in the stack, and that member fails, the stack should revert to a lower featured image unless there's a least one other stack member with the same feature set.

Also note, when you upgrade the stack, you'll need to be careful not to flash the whole stack since that may violate some member licenses.

Joseph W. Doherty Mon, 02/23/2009 - 11:36

Your reference is for the 3750-E, not the 3750G. Similar reference for the 3750 series can be found here: http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_46_se/configuration/guide/swstack.html#wp1191486.

What's appears to be critical is same SDM template and same stack protocol versions. Although same version is recommended, note master election process takes into account software feature set.

Redundancy is an issue, if stack member fails and it's the only member with the advanced feature set image.

mike.cadwgan Mon, 02/23/2009 - 13:49

Yes same version is recommended but not same feature set, election only takes into account feature set if there is no winner on the previous steps 1 - 3. SDM template looks like it is only different on the 3750 - 12s.

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