QoS and security ACEs - The access template might typically be used in an access switch at the network edge where the route table sizes might not be substantial. Filtering and QoS might be more important because an access switch is the entry to the whole network.
Routing - The routing template maximizes system resources for 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 Catalyst 3550 used as a Layer 2 switch.
Default - The default template gives balance to all functionalities (QoS, ACLs, unicast routing, multicast routing, VLANs and MAC addresses).
You can also enable the switch to support 144-bit Layer 3 TCAM, allowing extra fields in the stored routing tables, by reformatting the routing table memory allocation. Using the extended-match keyword with the default, access, or routing templates reformats the allocated TCAM by reducing the number of allowed unicast routes, and storing extra routing information in the lower 72 bits of the Layer 3 TCAM. The 144-bit Layer 3 TCAM is required when running the Web Cache Communication Protocol (WCCP) or multiple VPN routing/forwarding (multi-VRF) instances in customer edge (CE) devices (multi-VRF CE) on the switch.
Example of configuring the routing template:
Switch(config)# sdm prefer routing Switch(config)# end Switch# reload Proceed with reload? [confirm]
Web Cache Communications Protocol (WCCP)
The WCCP and Cisco cache engines (or other caches running WCCP) localize web-traffic patterns in the network, enabling content requests to be fulfilled locally. WCCP enables supported Cisco routers and switches to transparently redirect content requests. With transparent redirection, users do not have to configure their browsers to
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