04-Layer 2—LAN Switching Configuration Guide

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09-Layer 2 forwarding configuration
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Configuring normal Layer 2 forwarding

About normal Layer 2 forwarding

When an incoming frame's destination MAC address does not match any Layer 3 interface's MAC address, normal Layer 2 forwarding forwards the frame through a Layer 2 interface.

The device uses the destination MAC address of the frame to look for a match in the MAC address table.

·     The device forwards the frame out of the outgoing interface in the matching entry if a match is found.

·     The device floods the frame to all interfaces in the VLAN of the frame if no match is found.

Normal Layer 2 forwarding is enabled by default.

Restrictions: Hardware compatibility with Layer 2 forwarding

This feature is supported only on the following ports:

 

Hardware

Layer 2 forwarding and port compatibility

MSR810, MSR810-W, MSR810-W-DB, MSR810-LM, MSR810-W-LM, MSR810-10-PoE, MSR810-LM-HK, MSR810-W-LM-HK, MSR810-LMS-EA

Fixed Layer 2 Ethernet ports.

MSR2600-6-X1, MSR2600-10-X1

Fixed Layer 2 Ethernet ports.

MSR3600-28, MSR3600-51, MSR3600-28-SI, MSR3600-51-SI

Fixed Layer 2 Ethernet ports.

MSR3600-28-X1, MSR3600-28-X1-DP, MSR3600-51-X1, MSR3600-51-X1-DP

Fixed Layer 2 Ethernet ports.

MSR3610-I-DP, MSR3610-IE-DP

Fixed Layer 2 Ethernet ports.

Routers installed with an Ethernet switching module

Layer 2 Ethernet ports on Ethernet switching modules.

For more information about the support of the routers for Ethernet switching modules, see H3C MSR Router Series Comware 7 Interface Module Guide.

On Layer 2 Ethernet switching modules of MSR devices that are operating in IRF mode, Layer 2 forwarding across member devices is not supported. On SIC Layer 2 Ethernet switching modules, Layer 2 forwarding across member devices and slots is not supported.

Layer 2 forwarding across slots that reside on the same device is supported if multiple HMIM-24GSW, HMIM-24GSWP, HMIM-8GSW, or HMIM-8GSWF Layer 2 Ethernet switching modules are installed on the following devices:

·     MSR3640.

·     MSR3660.

Layer 2 forwarding across slots that reside on the same device is not supported on MSR3620-DP devices that are installed with multiple HMIM-8GSW or HMIM-8GSWF Layer 2 Ethernet switching modules.

Display and maintenance commands for Layer 2 forwarding

Execute display commands in any view and reset commands in user view.

 

Task

Command

Display Layer 2 forwarding statistics.

display mac-forwarding statistics [ interface interface-type interface-number ]

Clear Layer 2 forwarding statistics.

reset mac-forwarding statistics

 


Configuring fast Layer 2 forwarding

About fast Layer 2 forwarding

Fast Layer 2 forwarding improves packet forwarding efficiency by using a high-speed cache and flow-based technology. It identifies a flow by using the following items:

·     Source IP address.

·     Source port number.

·     Destination IP address.

·     Destination port number.

·     Protocol number.

·     Input interface.

·     Output interface.

·     VLAN ID.

Fast Layer 2 forwarding creates an entry in a high-speed cache by obtaining the forwarding information of a flow's first packet. Subsequent packets of the flow are forwarded based on the entry.

Fast Layer 2 forwarding is enabled by default.

Restrictions: Hardware compatibility with fast Layer 2 forwarding

This feature is supported only on the following ports:

 

Hardware

Fast Layer 2 forwarding and port compatibility

MSR810, MSR810-W, MSR810-W-DB, MSR810-LM, MSR810-W-LM, MSR810-10-PoE, MSR810-LM-HK, MSR810-W-LM-HK, MSR810-LMS-EA

Fixed Layer 2 Ethernet ports.

MSR2600-6-X1, MSR2600-10-X1

Fixed Layer 2 Ethernet ports.

MSR3600-28, MSR3600-51, MSR3600-28-SI, MSR3600-51-SI

Fixed Layer 2 Ethernet ports.

MSR3600-28-X1, MSR3600-28-X1-DP, MSR3600-51-X1, MSR3600-51-X1-DP

Fixed Layer 2 Ethernet ports.

MSR3610-I-DP, MSR3610-IE-DP

Fixed Layer 2 Ethernet ports.

Routers installed with an Ethernet switching module

Layer 2 Ethernet ports on Ethernet switching modules.

For more information about the support of the routers for Ethernet switching modules, see H3C MSR Router Series Comware 7 Interface Module Guide.

On Layer 2 Ethernet switching modules of MSR devices that are operating in IRF mode, Layer 2 forwarding across member devices is not supported. On SIC Layer 2 Ethernet switching modules, Layer 2 forwarding across member devices and slots is not supported.

Layer 2 forwarding across slots that reside on the same device is supported if multiple HMIM-24GSW, HMIM-24GSWP, HMIM-8GSW, or HMIM-8GSWF Layer 2 Ethernet switching modules are installed on the following devices:

·     MSR3640.

·     MSR3660.

Layer 2 forwarding across slots that reside on the same device is not supported on MSR3620-DP devices that are installed with multiple HMIM-8GSW or HMIM-8GSWF Layer 2 Ethernet switching modules.

Display and maintenance commands for fast Layer 2 forwarding

Execute display commands in any view.

 

Task

Command

Display IPv4 fast forwarding entries.

In standalone mode:

display mac-forwarding cache ip [ ip-address ]

In IRF mode:

display mac-forwarding cache ip [ ip-address ] [ slot slot-number ]

Display IPv4 fast forwarding entries for fragments.

In standalone mode:

display mac-forwarding cache ip fragment [ ip-address ]

In IRF mode:

display mac-forwarding cache ip fragment [ ip-address ] [ slot slot-number ]

Display IPv6 fast forwarding entries.

In standalone mode:

display mac-forwarding cache ipv6 [ ipv6-address ]

In IRF mode:

display mac-forwarding cache ipv6 [ ipv6-address ] [ slot slot-number ]

 

 

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