Cisco Catalyst 3750 Metro - Sdm Prefer

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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
sdm prefer
sdm prefer
Use the sdm prefer global configuration command to configure the template used in the Switch
Database Management (SDM) resource allocation. You can use a template to allocate system resources
to best support the features being used in your application. Use a template to provide maximum system
utilization for routing or for VLAN configuration
or to select the dual IPv4 and IPv6 template to
support IPv6 forwarding. Use the no form of this command to return to the default template.
sdm prefer {default | dual-ipv4-and-ipv6 {default | routing | vlan} | routing | vlan}
no sdm prefer
Syntax Description
Defaults The default template provides a balance to all features.
Command Modes Global configuration
Command History
Usage Guidelines You must reload the switch for the configuration to take effect.
Use the sdm prefer vlan global configuration command only on switches intended for Layer 2 switching
with no routing. When you use the VLAN template, no system resources are reserved for routing entries,
and any routing is done through software. This overloads the CPU and severely degrades routing
performance.
default Set the switch to use the default template to balance resources among features.
dual-ipv4-and-ipv6
{default | routing |
vlan}
Select a template that supports both IPv4 and IPv6 routing.
• default—Provide balance to IPv4 and IPv6 Layer 2 and Layer 3
functionality.
• routing—Provide maximum system usage for IPv4 and IPv6 routing,
including IPv4 policy-based routing.
• vlan—Provide maximum system usage for IPv4 and IPv6 VLANs.
routing Provide maximum system utilization for unicast routing. You would typically
use this template for a router or aggregator in the middle of a network.
Note This template does not support policy-based routing.
vlan Provide maximum system utilization for VLANs. This template maximizes
system resources for use as a Layer 2 switch with no routing.
Release Modification
12.1(14)AX This command was introduced.
12.2(25)EY The routing-pbr keywords for configuring the policy-based routing
template were removed. This template is no longer required for policy-based
routing.
12.2(52)SE The dual-ipv4-and-ipv6 templates were added.