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Objective 1.1a SDM templates by Mind Map: Objective 1.1a SDM templates
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Objective 1.1a SDM templates

CCNP Implementing Cisco IP Switched Networks (300-115) Objective 1.1.a SDM Templates By Rowell Dionicio


SDM manages L2 and L3 switching info

Maintained on Ternary Content Addressable Memory (TCAM), Used for forwarding lookups

TCAM designed for rapid table lookups by the ACL engine

ACL engine determines how switch handles packet, permitted, denied

Limited amount of entries


Resource contention

Resource exhaustion

SDM stands for Switching Database Manager



Can be shared between L2 and L3, Forwarding entries, RACLs, VACLs, QoS ACLs

Most switches have one TCAM

Table Structure

Layer 2 Learning, Port learning policies

Layer 2 Forwarding, Learned unicast and multicast addresses

Layer 3 Routing, Used for unicast and multicast route lookups

ACL and QoS table, Identifying traffic according to security and QoS ACLs

SDM Templates

Three predefined templates

Routing Template, Maximizes resources for unicast routing, When switch is used as a router or route aggregator

VLAN Template, Unicast routing disabled, Allows max number of supported MAC addresses, When switch is purely a L2 device

Default Template, Mix between routing and VLAN template

Two versions of each template

Desktop Template

Aggregator Template, Limited to specific switches

Switch reload required to use a new SDM template

Switch Stack

SDM template on master overrides a newly added switch

Resource Exhaustion

Results of resource exhaustion

L2 forwarding and learning, New learned addresses are flooded to all ports within the ingress VLAN

L3 routing, L3 unicast and multicast routes learned only in software and not in TCAM, Slower routing


Show commands

show sdm prefer

show sdm prefer vlan

To change SDM template

conf t

sdm prefer vlan / sdm prefer routing