HP 6120XG ProCurve Series 6120 Blade Switches Management and Configuration Gui - Page 277
Spanning Tree and IGMP., Half-Duplex and/or Different Port Speeds Not Allowed in LACP, Trunks.
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Port Trunking Trunk Group Operation Using LACP Spanning Tree and IGMP. If Spanning Tree and/or IGMP is enabled in the switch, a dynamic LACP trunk operates only with the default settings for these features and does not appear in the port listings for these features. Half-Duplex and/or Different Port Speeds Not Allowed in LACP Trunks. The ports on both sides of an LACP trunk must be configured for the same speed and for full-duplex (FDx). The 802.3ad LACP standard specifies a full-duplex (FDx) requirement for LACP trunking. (10-gigabit ports operate only at FDx.) A port configured as LACP passive and not assigned to a port trunk can be configured to half-duplex (HDx). However, in any of the following cases, a port cannot be reconfigured to an HDx setting: ■ If the port is a 10-gigabit port. ■ If a port is set to LACP Active, you cannot configure it to HDx. ■ If a port is already a member of a static or dynamic LACP trunk, you cannot configure it to HDx. ■ If a port is already set to HDx, the switch does not allow you to configure it for a static or dynamic LACP trunk. Dynamic/Static LACP Interoperation: A port configured for dynamic LACP can properly interoperate with a port configured for static (TrkX) LACP, but any ports configured as standby LACP links will be ignored. 11-25