Trunk Group Operation Using The "Trunk" Option; Trunk Operation Using The "Fec" Option - HP Procurve 2650 Management And Configuration Manual

Optimizing Traffic Flow with Port Controls, Port Trunking, and Port-Based Priority
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 speci-
fies a full-duplex (FDx) requirement for LACP trunking.
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:
I If a port is set to LACP Active, you cannot configure it to HDx.
I 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
I
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.

Trunk Group Operation Using the "Trunk" Option

This method creates a trunk group that operates independently of specific
trunking protocols and does not use a protocol exchange with the device on
the other end of the trunk. With this choice, the switch simply uses the SA/DA
method of distributing outbound traffic across the trunked ports without
regard for how that traffic is handled by the device at the other end of the
trunked links. Similarly, the switch handles incoming traffic from the trunked
links as if it were from a trunked source.
Use the Trunk option when you are trying to establish a trunk group between
a Switch 2650 or 6108 and another device, but the other device's trunking
operation fails to interoperate properly with LACP or FEC trunking configured
on the Switches 2650 and 6108.

Trunk Operation Using the "FEC" Option

This is the most flexible method for distributing traffic over trunked links
when connecting to devices that use the FEC (Fast EtherChannel
ogy. FEC trunks offer the following benefits:
Provide trunked connectivity to a FEC-compliant server, switch, or router.
I
I Enable quick convergence to remaining links when a failure is detected
on a trunked port link.
Port Trunking
®
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