SMC Networks SMC6824M manual Guidelines for Creating Trunks, General Guidelines

COMMAND LINE INTERFACE

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.

•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).

•If the port 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 group.

•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.

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