L
INK
A
GGREGATION
C
OMMANDS
-21
• 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.
• All the port s 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.
• S TP, VLAN, and IGMP settings can only be made for the entire trunk
via the specified port-channel.
• Dynamically Creating a Port Channel –
• Ports as signed to a common port channel must meet the following
criteria:
• Ports must have the same LACP system priority.
• Ports must h ave the same port admin key (Ethernet Interface).
• If the po rt channel admin key (lacp admin key - Port Channel) is not
set when a channel group is formed (i.e., it has the null value of 0), this
key is set to the same value as the port admin key (lacp admin key -
Ethernet Interface) used by the interfaces that joined the gro up.
• However, if the port channel admin key is set, then the port admin key
must be set to the same value for a port to be allowed to join a channel
group.
• If a link goes down, LACP port priority is used to select the backup
link.
channel-group
This command adds a port to a trunk. Use the no form to remove a port
from a trunk.
Syntax
channel-group channel-id
no channel-group
channel-id - Trunk index (Range: 1-6)