Enabling Multicast Performance Enhancement on VDCs

This chapter describes how to enable the multicast performance enhancement for Cisco Nexus 7000 Series M1-XL Ethernet modules that are allocated to virtual device contexts (VDCs) in Cisco NX-OS devices.

Information About Multicast Performance Enhancement

In Cisco NX-OS 6.2(2) and later releases, the multicast performance enhancement supports the optimized shim frame format in multicast-replicated frames to improve multicast performance. The enhancement is supported on both Cisco Nexus 7000 M1 and M3 Series Ethernet modules with an XL option (M1-XL / M3-XL) that are allocated as resources in virtual device contexts (VDCs).

Guidelines and Limitations for Enhanced Multicast Performance

Enhanced multicast performance can be enabled only on Cisco Nexus 7000 Series M1-XL Ethernet modules that are allocated to a virtual device context (VDC).

Enabling Multicast Performance Enhancement


Note

If you are familiar with the Cisco IOS CLI, be aware that the Cisco NX-OS commands for this feature might differ from the Cisco IOS commands that you would use.

Before you begin

  • You must create the VDC on which you want to enable the multicast performance enhancement. For information, see the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide.

  • You have the name for the VDC to be configured.

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Switch# configure terminal
Switch(config)#

Enables global configuration mode.

Step 2

vdc vdc-name

Example:

Switch(config)# vdc MyVDC 
Switch(config-vdc)#

Specifies a VDC and enters VDC configuration mode.

Step 3

limit-resource module-type m1xl

Example:

Switch(config-vdc)# limit resource module-type m1xl
This will cause all ports of unallowed types to be removed from this vdc. Continue? [yes] Y 
Switch(config-vdc)#

Limits the resources for the VDC being configured to Cisco Nexus 7000 Series Ethernet modules with an XL Option only.

Step 4

switchto vdc vdc-name

Example:

Switch(config-vdc)# switchto vdc MyVDC
Switch-MyVDC(config-vdc#)

Switches from the default VDC to the specified VDC.

Note

 

You must be a network-admin or network-operator to use the switchto vdc command.

Step 5

hardware forwarding shim

Example:

Switch-MyVDC(config-vdc)# hardware forwarding shim

Enables shim optimization in frame header for this VDC.

Step 6

show vdc vdc-name [detail]

Example:

Switch-MyVDC(config-vdc)# show vdc MyVDC

(Optional) Displays information about the specified VDC.

Step 7

copy running-config startup-config

Example:

Switch-MyVDC(config-vdc)# copy running-config startup-config

(Optional) Copies the running configuration to the startup configuration.

Related Documents for Multicast Performance Enhancement

Related Topic

Document Title

Multicast commands

 Cisco Nexus 7000 Series NX-OS Multicast Routing Command Reference

VDCs

 Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide

VDC commands

 Cisco Nexus 7000 Series NX-OS Virtual Device Context Command Reference

Feature History for Multicast Performance Enhancement

This Table lists the release history for this feature.

Table 1. Feature History for Multicast Performance Enhancement

Feature Name

Releases

Feature Information

Multicast performance enhancement

6.2(2)

Enables enhanced multicast performance on Cisco Nexus 7000 Series Ethernet modules with an XL Option allocated to virtual device contexts (VDCs).

The following command was introduced: hardware forwarding shim .