Link Aggregation Commands 4

Link Aggregation Commands

Ports can be statically grouped into an aggregate link (i.e., trunk) to increase the bandwidth of a network connection or to ensure fault recovery. Or you can use the Link Aggregation Control Protocol (LACP) to automatically negotiate a trunk link between this switch and another network device. For static trunks, the switches have to comply with the Cisco EtherChannel standard. For dynamic trunks, the switches have to comply with LACP. This switch supports up to six trunks. For example, a trunk consisting of two 1000 Mbps ports can support an aggregate bandwidth of

4 Gbps when operating at full duplex.

Table 4-52 Link Aggregation Commands

Command

Function

Mode

Page

 

 

 

 

Manual Configuration Commands

 

 

 

 

 

 

interface port-channel

Configures a trunk and enters interface

GC

4-143

 

configuration mode for the trunk

 

 

channel-group

Adds a port to a trunk

IC (Ethernet)

4-158

 

 

 

 

Dynamic Configuration Commands

 

 

 

 

 

 

lacp

Configures LACP for the current interface

IC (Ethernet)

4-159

 

 

 

 

lacp system-priority

Configures a port's LACP system priority

IC (Ethernet)

4-160

 

 

 

 

lacp admin-key

Configures a port's administration key

IC (Ethernet)

4-161

 

 

 

 

lacp admin-key

Configures an port channel’s administration key

IC (Port Channel)

4-161

 

 

 

 

lacp port-priority

Configures a port's LACP port priority

IC (Ethernet)

4-162

 

 

 

 

Trunk Status Display Commands

 

 

 

 

 

 

show interfaces status

Shows trunk information

NE, PE

4-150

port-channel

 

 

 

show lacp

Shows LACP information

PE

4-163

 

 

 

 

Guidelines for Creating Trunks

General Guidelines –

Finish configuring port trunks before you connect the corresponding network cables between switches to avoid creating a loop.

A trunk can have up to 8 ports.

The ports at both ends of a connection must be configured as trunk ports.

All ports in a trunk must be configured in an identical manner, including communication mode (i.e., speed and duplex mode), VLAN assignments, and CoS settings.

Any of the Gigabit ports on the front panel can be trunked together, including ports of different media types.

All the ports in a trunk have to be treated as a whole when moved from/to, added or deleted from a VLAN via the specified port-channel.

STP, VLAN, and IGMP settings can only be made for the entire trunk via the specified port-channel.

4-157

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Microsoft ES4649, ES4625 manual Link Aggregation Commands, Manual Configuration Commands, Dynamic Configuration Commands

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