Trunk Group Operation Using The "Trunk" Option - HP ProCurve 6400cl Series Management And Configuration Manual

Port Trunking

Trunk Group Operation Using the "Trunk" Option

12-24
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. (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.
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.
When a trunk group is configured with the trunk option, the switch automati­
cally sets the trunk to a priority of "4" for spanning-tree operation (even if
spanning-tree is currently disabled. This appears in the running-config file as
spanning-tree Trkn priority 4. Executing write memory after config­
uring the trunk places the same entry in the startup-config file.