Cisco R&S: SDM Templates On Switching Gear

On occasion, I have needed to change the SDM template for one reason or another.  Primarily to be able to do PBR on 3750s (routing template).  I thought it would be an interesting post to walk through the different SDM templates available.  You may have certain needs in your network, and changing from the default template may be beneficial for you.  Use with caution though.
Below are the different SDM templates:

• Access—The access template maximizes system resources for access control lists (ACLs) to accommodate a large number of ACLs.
• Default—The default template gives balance to all functions.
• Routing—The routing template maximizes system resources for IPv4 unicast routing, typically required for a router or aggregator in the center of a network.
• VLANs—The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.

These SDM templates support IPv4 and IPv6 environments:

• Desktop dual IPv4 and IPv6 default template—supports Layer 2, multicast, routing, QoS, and ACLs for IPv4; and Layer 2, routing, and ACLs for IPv6 on desktop switches (all Catalyst 3750 switches except Catalyst 3750-12S).
• Desktop dual IPv4 and IPv6 routing template—supports Layer 2, multicast, routing (including policy-based routing), QoS, and ACLs for IPv4; and Layer 2, routing, and ACLs for IPv6 on desktop switches (all Catalyst 3750 switches except Catalyst 3750-12S).
• Desktop dual IPv4 and IPv6 VLAN template—supports basic Layer 2, multicast, QoS, and ACLs for IPv4, and basic Layer 2 and ACLs for IPv6 on desktop switches.
• Aggregator dual IPv4 and IPv6 default template—supports Layer 2, multicast, routing, QoS, and ACLs for IPv4, and Layer 2 and routing for IPv6 on Catalyst 3750-12S aggregator switches.
• Aggregator dual IPv4 and IPv6 routing template—supports Layer 2, multicast, routing (including policy-based routing), QoS, and ACLs for IPv4; and Layer 2, routing, and ACLs for IPv6 on Catalyst 3750-12S aggregator switches.
• Aggregator dual IPv4 and IPv6 VLAN template—supports basic Layer 2, multicast, QoS, and ACLs for IPv4,and basic Layer 2 and ACLs for IPv6 on Catalyst 3750-12S switches.