04-Network Connectivity

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09-Layer 2 forwarding configuration
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09-Layer 2 forwarding configuration 47.61 KB

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.

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.

Display and maintenance commands for fast Layer 2 forwarding

Execute display commands in any view.

Task

Command

Display IPv4 fast forwarding entries.

display mac-forwarding cache ip [ ip-address ]

Display IPv4 fast forwarding entries for fragments.

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

Display IPv6 fast forwarding entries.

display mac-forwarding cache ipv6 [ ipv6-address ]