L
INK
A
GGREGATION
C
OMMANDS
25-2
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 8 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 and duplex mode), VLAN
assignments, and CoS settings.
• Any of the Gigabit ports on the front panel can be trunked together,
including ports 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.
Dynamically Creating a Port Channel –
Ports assigned to a common port channel must meet the following
criteria:
• Ports must have the same LACP system priority.
• Ports must have the same port admin key (Ethernet Interface).
lacp admin-key Configures an port
channel’s administration key
IC (Port Channel) 25-8
lacp port-priority Configures a port's LACP
port priority
IC (Ethernet) 25-9
Trunk Status Display Commands
show interfaces status
port-channel
Shows trunk information NE, PE 24-12
show lacp Shows LACP information PE 25-10
Table 25-1 Link Aggregation Commands (Continued)
Command Function Mode Page
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