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12
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 16 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 –
◆
Finish configuring trunks before you connect the corresponding network
cables between switches to avoid creating a loop.
◆
A trunk can have up to 8 ports.
Table 71: Link Aggregation Commands
Command
Function
Mode
Manual Configuration Commands
port-channel
Configures a trunk and enters interface
configuration mode for the trunk
GC
Sets the load-distribution method among ports in
aggregated links
GC
Adds a port to a trunk
IC (Ethernet)
Dynamic Configuration Commands
Configures LACP for the current interface
IC (Ethernet)
Configures a port's administration key
IC (Ethernet)
Configures a port's LACP port priority
IC (Ethernet)
Configures a port's LACP system priority
IC (Ethernet)
Configures an port channel’s administration key IC (Port Channel)
Configures the timeout to wait for next LACPDU IC (Port Channel)
Trunk Status Display Commands
port-channel
Shows trunk information
NE, PE
Shows LACP information
PE
Shows the load-distribution method used on
aggregated links
PE
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