Configuring SDM Templates

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Information About Configuring SDM Templates

SDM Templates

You can use SDM templates to configure system resources to optimize support for specific features, depending on how your device is used in the network. You can select a template to provide maximum system usage for some functions.

These templates are supported on your device:

  • Advanced—The advanced template is available on all supported images for this release. It maximizes system resources for features like netflow, multicast groups, security ACEs, QoS ACEs, and so on.

  • VLAN—The VLAN template is available only on the LAN Base license. The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 device.

After you change the template and the system reboots, you can use the show sdm prefer privileged EXEC command to verify the new template configuration. If you enter the show sdm prefer command before you enter the reload privileged EXEC command, the show sdm prefer command shows the template currently in use and the template that will become active after a reload.

The default is the advanced template.

Table 1 Approximate Number of Feature Resources Allowed by Templates

Resource

Advanced

VLAN

Number of VLANs

4094

4094

Unicast MAC addresses

32 K

32 K

Overflow unicast MAC addresses

512

512

IGMP groups and multicast routes

4 K

4 K

Overflow IGMP groups and multicast routes

512

512

  • Directly connected routes

32 K

32 K

  • Indirectly connected IP hosts

8 K

8 K

Policy-based routing ACEs

1024

0

QoS classification ACEs

3 K

3 K

Security ACEs

3 K

3 K

Netflow ACEs

1024

1024

Input Microflow policer ACEs:

256 K

0

Output Microflow policer ACEs:

256 K

0

FSPAN ACEs

256

256

Control Plane Entries:

512

512

Input Netflow flows:

8 K

8 K

Output Netflow flows:

16 K

16 K


Note

When the switch is used as a Wireless Mobility Agent, the only template allowed is the advanced template.


Note

SDM templates do not create VLANs. You must create the VLANs before adding commands to the SDM templates.

The tables represent approximate hardware boundaries set when a template is selected. If a section of a hardware resource is full, all processing overflow is sent to the CPU, seriously impacting switch performance.

SDM Templates and Switch Stacks

In a switch stack, all stack members must use the same SDM template that is stored on the active switch. When a new switch is added to a stack, the SDM configuration that is stored on the active switch overrides the template configured on an individual switch.

You can use the show switch privileged EXEC command to see if any stack members are in SDM mismatch mode.

How to Configure SDM Templates

Configuring SDM Templates

Configuring the Switch SDM Template

Setting the SDM Template

Follow these steps to use the SDM template to maximize feature usage:

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    sdm prefer { advanced | vlan }

    4.    end

    5.    reload


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example: 
    Device> enable
     

    Enables privileged EXEC mode. Enter your password if prompted.

     

    Step 2configure terminal


    Example: 
    
Device# configure terminal
     

    Enters the global configuration mode.

     
    Step 3 sdm prefer { advanced | vlan }


    Example: 
    Device(config)# sdm prefer advanced
     

    Specifies the SDM template to be used on the switch. The keywords have these meanings:

    • advanced —Supports advanced features such as Netflow.

    • vlan —Maximizes VLAN configuration on the switch with no routing supported in hardware.

    Note   

    The no sdm prefer command and a default template is not supported.

     
    Step 4end


    Example: 
    
Device(config)# end
     

    Returns to privileged EXEC mode.

     
    Step 5reload


    Example: 
    Device# reload
     

    Reloads the operating system.

     

    Monitoring and Maintaining SDM Templates

    Command Purpose

    show sdm prefer

    Displays the SDM template in use.

    reload

    Reloads the switch to activate the newly configured SDM template.

    no sdm prefer

    Sets the default SDM template.


    Note

    The SDM templates contain only those commands that are defined as part of the templates. If a template enables another related command that is not defined in the template, then this other command will be visible when the show running config command is entered. For example, if the SDM template enables the switchport voice vlan command, then the spanning-tree portfast edge command may also be enabled (although it is not defined on the SDM template).

    If the SDM template is removed, then other such related commands are also removed and have to be reconfigured explicitly.

    Configuration Examples for SDM Templates

    Examples: Configuring SDM Templates

    This example shows how to configure the VLAN template: 

    		
Device(config)# sdm prefer vlan 
Device(config)# exit
Device# reload
		Proceed with reload? [confirm]

    Examples: Displaying SDM Templates

    This is an example output showing the advanced template information: 

    Device# show sdm prefer 

Showing SDM Template Info

This is the Advanced template.
  Number of VLANs:                                 4094
  Unicast MAC addresses:                           32768
  Overflow Unicast MAC addresses:                  512
  IGMP and Multicast groups:                       8192
  Overflow IGMP and Multicast groups:              512
  Directly connected routes:                       32768
  Indirect routes:                                 8192
  Security Access Control Entries:                 3072
  QoS Access Control Entries:                      2816
  Policy Based Routing ACEs:                       1024
  Netflow ACEs:                                    1024
  Input Microflow policer ACEs:                    256
  Output Microflow policer ACEs:                   256
  Flow SPAN ACEs:                                  256
  Tunnels:                                         256
  Control Plane Entries:                           512
  Input Netflow flows:                             8192
  Output Netflow flows:                            16384
These numbers are typical for L2 and IPv4 features.
Some features such as IPv6, use up double the entry size;
so only half as many entries can be created.

    This is an example output showing the VLAN template information: 

     
Device# show sdm prefer vlan

Showing SDM Template Info

This is the VLAN template for a typical Layer 2 network.
  Number of VLANs:                                 4094
  Unicast MAC addresses:                           32768
  Overflow Unicast MAC addresses:                  512
  IGMP and Multicast groups:                       8192
  Overflow IGMP and Multicast groups:              512
  Directly connected routes:                       32768
  Indirect routes:                                 8192
  Security Access Control Entries:                 3072
  QoS Access Control Entries:                      3072
  Policy Based Routing ACEs:                       0
  Netflow ACEs:                                    1024
  Input Microflow policer ACEs:                    0
  Output Microflow policer ACEs:                   0
  Flow SPAN ACEs:                                  256
  Tunnels:                                         0
  Control Plane Entries:                           512
  Input Netflow flows:                             16384
  Output Netflow flows:                            8192
These numbers are typical for L2 and IPv4 features.
Some features such as IPv6, use up double the entry size;
so only half as many entries can be created.

Device#

    Additional References for SDM Templates

    Related Documents

    Related Topic Document Title
    SDM command reference

    System Management Command Reference (Catalyst 3850 Switches)
    VLAN configuration guide

    VLAN Configuration Guide (Catalyst 3850 Switches)

    Standards and RFCs

    Standard/RFC Title
    None

    —

    MIBs

    MIB MIBs Link
    All supported MIBs for this release.

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    http:/​/​www.cisco.com/​go/​mibs

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    Feature History and Information for Configuring SDM Templates

    Release

    Modification

    Cisco IOS XE 3.2SE

    This feature was introduced.