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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
524
5.16 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 four trunks. For
Example, a trunk
consisting of two 1000 Mbps ports can support an aggregate bandwidth of 4 Gbps when operating at full duplex.
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 Command
lacp Configures LACP for the current interface IC (Ethernet)
lacp system-priority Configures a port's LACP system priority IC (Ethernet)
lacp admin-key Configures a port's administration key IC (Ethernet)
lacp admin-key Configures an port channel’s administration key IC (Port
Channel)
lacp port-priority Configures a port's LACP port priority IC (Ethernet)
Trunk Status Display Command
show interfaces status
port-channel
Shows trunk information NE, PE
show lacp Shows LACP information PE
Table 5-54 Link Aggregation Commands
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 eight 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, duplex mode and flow
control), VLAN assignments, and CoS settings.
Any of the SFP transceivers can be trunked together, including those 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.