8-4
Catalyst 3750 SwitchSoftware Configuration Guide
OL-8550-09
Chapter8 Configuring SDM Templates
Configuring the Switch SDM Template
If the stack master is a Catalyst 3750-12S switch using an aggregator template and a new stack member
is not a Catalyst 3750-12S, the stack member is not able to support the template that is running on the
stack master. The switch attempting to join the stack goes into SDM mismatch mode, the stack master
does not attempt to change the SDM template, and the switch cannot be a functioning member of the
stack.
If the stack master is a Catalyst 3750-12S, changing the template can create these results:
•If you change the template from an aggregator template to a desktop template and reload the switch,
the entire stack operates with the selected desktop template. This could cause configuration losses
if the number of TCAM entries exceeds the desktop template sizes.
•If you change the template from a desktop template to an aggregator template and reload the switch,
any desktop switches that were part of the stack go into the SDM mismatch mode. When this occurs,
a syslog message is sent to the stack master indicating that a stack member has gone into the SDM
mismatch mode and suggesting the steps to take to bring the switch out of the mismatch mode.
You can use the show switch privileged EXEC command to see if any stack members are in SDM
mismatch mode. This example shows the output from the show switch privileged EXEC command when
an SDM mismatch exists:
Switch# show switch
Current
Switch# Role Mac Address Priority State
------------------------------------------------------------
*2 Master 000a.fdfd.0100 5 Ready
4 Member 0003.fd63.9c00 5 SDM Mismatch
This is an example of a syslog message notifying the stack master that a stack member is in SDM
mismatch mode:
2d23h:%STACKMGR-6-SWITCH_ADDED_SDM:Switch 2 has been ADDED to the stack (SDM_MISMATCH)
2d23h:%SDM-6-MISMATCH_ADVISE:
2d23h:%SDM-6-MISMATCH_ADVISE:
2d23h:%SDM-6-MISMATCH_ADVISE:System (#2) is incompatible with the SDM
2d23h:%SDM-6-MISMATCH_ADVISE:template currently running on the stack and
2d23h:%SDM-6-MISMATCH_ADVISE:will not function unless the stack is
2d23h:%SDM-6-MISMATCH_ADVISE:downgraded. Issuing the following commands
2d23h:%SDM-6-MISMATCH_ADVISE:will downgrade the stack to use a smaller
2d23h:%SDM-6-MISMATCH_ADVISE:compatible desktop SDM template:
2d23h:%SDM-6-MISMATCH_ADVISE:
2d23h:%SDM-6-MISMATCH_ADVISE: "sdm prefer vlan desktop"
2d23h:%SDM-6-MISMATCH_ADVISE: "reload"
Configuring the Switch SDM Template
•Default SDM Template, page8-4
•SDM Template Configuration Guidelines, page8-5
•Setting the SDM Template, page8-6

Default SDM Template

The default template for desktop switches is the default desktop template. The default template for the
Catalyst 3750-12S is the default aggregator template.