Table Of Contents

Command Reference

QoS Commands

qos switching

qos mapping precedence

show qos switching

show qos mapping

SDM Commands

sdm autolearn

sdm size

show sdm size

Command Reference

---

This appendix provides a command reference for those Cisco IOS commands—or aspects of the commands—that are unique to Layer 3 switching.

QoS Commands

qos switching

To enable quality of service (QoS) mapping on the device, use the qos switching command. To disable it, use the no form of this command.

qos switching

no qos switching

Syntax Description

This command has no keywords or arguments.

Defaults

QoS mapping is enabled.

Command Modes

Device configuration

Examples

The following example shows how to enable QoS mapping using the qos switching configuration command.

Router# qos switching

Related CommandsRelated Command

qos mapping precedence

qos mapping precedence

To configure QoS mapping at the system or interface level, use the qos mapping precedence command. To set the QoS precedence back to the default value, use the no form of this command.

qos mapping [destination dest-int] precedence value wrr-weight weight

no qos mapping precedence

Syntax Description

dest-int	Destination interface to which you want to define a traffic precedence; optional.
value	Precedence value derived from the higher two bits of the IP precedence field. Valid values are 0 to 3 inclusive.
weight	WRR-scheduling weight. Valid values are 1 to 4 inclusive. This specifies the weight assigned to traffic with the given precedence value.

Defaults

The default WRR-weights for precedence values 0, 1, 2, 3 are 1, 2, 3, and 4, respectively.

Command Modes

Device configuration

Examples

The following example shows how to set the system-level QoS mapping using the
qos mapping precedence configuration command.

Router(config)# qos mapping precedence 0 wrr-weight 4

Related CommandsRelated Command

qos switching

show qos switching

To show whether QoS mapping is enabled on the device, use the show qos switching command.

show qos switching

Syntax Description

This command has no keywords or arguments.

Command Modes

Privileged EXEC

Examples

The following example shows how to display whether QoS mapping is enabled using the show qos switching command.

Router# show qos switching

QoS Based IP Switching enabled

Related CommandsRelated Command

show qos mapping

show qos mapping

To show the QoS mapping in effect at the system or destination interface level, use the show qos mapping command.

show qos mapping [destination dest-int]

Syntax Description

dest-int

Destination interface to which you want to display QoS mapping; optional.

Command Modes

Privileged EXEC

Examples

The following example shows how to display the system-level QoS mapping using the show qos mapping command.

Router# show qos mapping

Precedence WRR-Weight

     0       1

     1       2

     2       3

     3       4

Related CommandsRelated Command

qos switching

SDM Commands

sdm autolearn

To enable the Switch Database Manager (SDM) autolearn feature, use the sdm autolearn command. To disable it, use the no form of this command. When the SDM autolearn feature is enabled, SDM automatically saves mask-length distribution for the routing database. SDM then uses this mask-length distribution as the initial mask-length distribution, which takes effect during the next system reboot.

sdm autolearn

no sdm autolearn

Syntax Description

This command has no keywords or arguments.

Defaults

SDM autolearn is enabled.

Related CommandsCommand Mode

Global configuration

sdm size

To configure the size of each protocol region in the SDM, use the sdm size command.

sdm size region-name{k-entries}num-of-entries

Syntax Description

region-name	Name of the protocol region for which you want to configure the size. •ipx-bvi-network—ipx bvi region •ip-adjacency—ip adjacency region •ipx-node—ipx node region •ip-prefix—ip prefix region •ipx-network—ipx network region •ip-mcast—ip multicast region •l2-switching—L2 MAC address region
num-of-entries	Size can be entered either as multiples of 1K (that is 1024) entries or in absolute number of entries.

Command Modes

Global configuration

Usage Guidelines

The combined size entered for all the protocol regions should not exceed 32K, which is the total TCAM size. The supported size can be displayed using the show sdm size command. The size of SDM is represented as the number of base entries. Each protocol region entry can occupy one or more TCAM entries. The combined size of all the protocol regions should be calculated in terms of the base entries. Table A-1 lists the number of TCAM entries needed for each protocol region.

Table A-1 Number of TCAM Entries Needed for Each Protocol Region

Protocol Region	TCAM Entries
ipx-bvi-network	1
ip-adjacency	1
ipx-node	2
ip-prefix	1
ipx-network	1
ip-mcast	2
l2-forwarding	2

Since, the ip-prefix region occupies one TCAM entry, the sdm size ip-prefix k-entries 6 command configures 6K TCAM entries in the SDM for the ip-prefix region. Since each ipx-node entry occupies two TCAM entries, the sdm size ipx-node k-entries 3 command configures 6K TCAM entries in the SDM for the ipx-node region.

Related CommandsRelated Command

show sdm size

show sdm size

To display the size of TCAM and the size of each protocol region, use the show sdm size command. The size is shown as number of entries

show sdm size

Syntax Description

This command has no keywords or arguments.

Command Modes

Privileged EXEC

Examples

The following is sample output from the show sdm size command.

Router#show sdm size 

Switching Database Region Sizes :

    IPX BVI Network     : 32      32-bit entries

    IP Adjacency        : 2048    32-bit entries

    IPX Node            : 2048    64-bit entries

    IP Prefix           : 8192    32-bit entries

    IPX Network         : 6144    32-bit entries

    IP Multicast        : 3072    64-bit entries

    MAC Addr            : 1024    64-bit entries

Related CommandsRelated Command

sdm size