04-Layer 2 - LAN Switching

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07-Layer 2 forwarding configuration
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07-Layer 2 forwarding configuration 39.72 KB

Configuring Layer 2 forwarding

Command and hardware compatibility

The WX1800H series, WX2500H series, and WX3000H series access controllers do not support the slot keyword or the slot-number argument.

Configuring 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.

Configuration procedure

Normal Layer 2 forwarding is enabled by default.

Displaying and maintaining normal 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

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.

Configuration procedure

Fast Layer 2 forwarding is enabled by default.

Displaying and maintaining fast Layer 2 forwarding

Execute display commands in any view.

 

Task

Command

Display IPv4 fast forwarding entries.

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

Display IPv4 fast forwarding entries for fragments.

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

Display IPv6 fast forwarding entries.

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