Enterasys Networks 9034313-07 manual Commands

Link Aggregation Control Protocol (LACP)

is, will block redundant paths). For information about building static aggregations, refer to set lacp static (page 7‐48).

Each SecureStack C3 module provides six virtual link aggregator ports, which are designated in the CLI as lag.0.1 through lag.0.6. Each LAG can have up to eight associated physical ports. Once underlying physical ports (for example, fe.x.x, or ge.x.x) are associated with an aggregator port, the resulting aggregation will be represented as one LAG with a lag.0.x port designation. LACP determines which underlying physical ports are capable of aggregating by comparing operational keys. Aggregator ports allow only underlying ports with keys matching theirs to join their LAG.

LACP uses a system priority value to build a LAG ID, which determines aggregation precedence. If there are two partner devices competing for the same aggregator, LACP compares the LAG IDs for each grouping of ports. The LAG with the lower LAG ID is given precedence and will be allowed to use the aggregator.

There are a few cases in which ports will not aggregate:

•An underlying physical port is attached to another port on this same switch (loopback).

•There is no available aggregator for two or more ports with the same LAG ID. This can happen if there are simply no available aggregators, or if none of the aggregators have a matching admin key and system priority.

•802.1x authentication is enabled using the set eapol command (page 16‐18) and ports that would otherwise aggregate are not 802.1X authorized.

The LACP implementation on the SecureStack C3 device will allow up to eight physical ports into a LAG. The device with the lowest LAG ID determines which underlying physical ports are allowed into a LAG based on the ports’ LAG port priority. Ports with the lowest LAG port priority values are allowed into the LAG and all other speed groupings go into a standby state.

Multi‐port LAGs will continue to operate as long as there is at least one active port in the LAG. Therefore, there is no need to create backup single port LAGs or to specifically assign the LAG and all its physical ports to the egress list of the LAG’s VLAN.

Typically, two or more ports are required to form a LAG. However, you can enable the creation of single port LAGs as described in “set lacp singleportlag” on page 7‐50. If a single port LAG goes down and the switch stays up, the switch will reconfigure the LAG to the same LAG number if the port comes back up.

Note: To aggregate, underlying physical ports must be running in full duplex mode and must be of the same operating speed.

Commands

For information about...	Refer to page...
show lacp	7-45
set lacp	7-46
set lacp asyspri	7-47
set lacp aadminkey	7-47
clear lacp	7-48
set lacp static	7-48
clear lacp static	7-49

7-44 Port Configuration