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28 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 5 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
General Guidelines –
â—† Finish configuring port trunks before you connect the corresponding
network cables between switches to avoid creating a loop.
â—† A trunk can have up to 8 ports.
â—† The ports at both ends of a connection must be configured as trunk
ports.
â—† 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.
Table 88: Link Aggregation Commands
Command Function Mode
Manual Configuration Commands
interface port-channel Configures a trunk and enters interface
configuration mode for the trunk
GC
channel-group Adds a port to a trunk IC (Ethernet)
Dynamic Configuration Commands
lacp Configures LACP for the current interface IC (Ethernet)
lacp admin-key Configures a port's administration key IC (Ethernet)
lacp port-priority Configures a port's LACP port priority IC (Ethernet)
lacp system-priority Configures a port's LACP system priority IC (Ethernet)
lacp admin-key Configures an port channel’s administration key IC (Port Channel)
Trunk Status Display Commands
show interfaces status
port-channel
Shows trunk information NE, PE
show lacp Shows LACP information PE
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