24-Port Layer 3 Switch Management Guide

L INK A GGREGATION C OMMANDS
4-137
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.
Guidelines for Creating Trunks
• Finish configuring port trunks before you connect the corresponding
network cables between switches to avoid creating a loop.
• A trunk can have up to four 10/100 Mbps ports or up to two 1000
Mbps ports.
• The ports at both ends of a connection must be configured as trunk
ports.
• All ports in a trunk must consist of the same media type (i.e.,
twisted-pair or fiber).
• All ports in a trunk must be configured in an identical manner,
including communication mode (i.e., speed, duplex mode and flow
control), VLAN assignments, and CoS settings.
Command Function Mode Page
Manual Configuration Commands
interface
port-channel
Configures a trunk and enters interface
configuration mode for the trunk
GC 4-119
channel-group Adds a port to a trunk IC 4-138
Dynamic Configuration Command
lacp Configures LACP for the current interface IC 4-139
Trunk Status Display Command
show interfaces
status port-channel
Shows trunk information NE,
PE
4-128