Vlans And Dynamic Lacp; Blocked Ports With Older Devices - HP Aruba JL253A Management And Configuration Manual

For arubaos-switch 16.08

Table of Contents

VLANs and dynamic LACP

A dynamic LACP trunk operates only in the default VLAN (unless you have enabled GVRP on the switch and use

Forbid to prevent the ports from joining the default VLAN).

If you want to use LACP for a trunk on a non-default VLAN and GVRP is disabled, configure the trunk as a static

Some older devices are limited to four ports in a trunk. When eight LACP-enabled ports are connected to one of

these older devices, four ports connect, but the other four ports are blocked. The LACP status of the blocked

ports is shown as "Failure."

If one of the other ports becomes disabled, a blocked port replaces it (Port Status becomes "Up"). When the other

port becomes active again, the replacement port goes back to blocked (Port Status is "Blocked"). It can take a few

seconds for the switch to discover the current status of the ports.

Blocked ports with LACP

switch(eth-B1-B8)# show lacp

If there are ports that you do not want on the default VLAN, ensure that they cannot become dynamic LACP trunk

members. Otherwise a traffic loop can unexpectedly occur. For Example:

Figure 15: A dynamic LACP trunk forming in a VLAN can cause a traffic loop

Easy control methods include either disabling LACP on the selected ports or configuring them to operate in static

LACP trunks.

Aruba 2930F / 2930M Management and Configuration Guide

for ArubaOS-Switch 16.08