HP 6120XG ProCurve Series 6120 Blade Switches Management and Configuration Gui - Page 276
Blocked Ports with LACP
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Port Trunking Trunk Group Operation Using LACP ProCurve(eth-B1-B8)# show lacp LACP PORT NUMB ---B1 B2 B3 B4 B5 B6 B7 B8 LACP ENABLED ------Active Active Active Active Active Active Active Active TRUNK GROUP ------Dyn1 Dyn1 Dyn1 Dyn1 Dyn1 Dyn1 B7 B8 PORT STATUS ------Up Up Up Up Blocked Blocked Down Down LACP PARTNER ------Yes Yes Yes Yes Yes Yes No No LACP STATUS ------Success Success Success Success Failure Failure Success Success Figure 11-11. Blocked Ports with 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: VLAN-1 (Default VLAN) VLAN-1 (Default VLAN) VLAN-1 (Default VLAN) VLAN-1 (Default VLAN) VLAN-2 VLAN-2 VLAN-2 VLAN-2 If the ports in VLAN 2 are configured to allow a dynamic trunk (and GVRP is disabled), adding a second link in VLAN 2 automatically forms a dynamic LACP trunk and moves the trunk to VLAN-1 (the default VLAN), which creates a traffic loop in VLAN 1 between the two switches and eliminates the link in VLAN 2 between the two switches. Figure 11-12. 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. 11-24