Port Trunk Features And Operation - HP ProCurve 6400cl Series Management And Configuration Manual

Port Trunking

Port Trunk Features and Operation

L A C P N o t e
12-4
Port Trunk Features and Operation
The switches covered by this guide offer these options for port trunking:
■ LACP: IEEE 802.3ad—page 12-18
Trunk: Non-Protocol—page 12-24
■
■ FEC: Fast EtherChannel® (available only on the Series 5300xl
switches)—page 12-25)
The number of trunk groups supported on a given switch depends on the
switch model and the number of ports physically available on the switch.
Switch Model
Series 5300xl Switches
Series 3400cl Switches
Series 6400cl Switches
*Actual maximum depends on the number of ports available on the switch and the number
of links in each trunk.
(Using the Link Aggregation Control Protocol—LACP—option, you can
include standby trunked ports in addition to the maximum of eight actively
trunking ports.)
LACP requires full-duplex (FDx) links of the same media type (10/100Base-T,
100FX, etc.) and the same speed, and enforces speed and duplex conformance
across a trunk group. For most installations, HP recommends that you leave
the port Mode settings at Auto (the default). LACP also operates with Auto-10,
Auto-100, and Auto-1000 (if negotiation selects FDx), and 10FDx, 100FDx, and
1000FDx settings. (The 10-gigabit ports available for some switch models allow
only the Auto setting.)
Fault Tolerance: If a link in a port trunk fails, the switch redistributes
traffic originally destined for that link to the remaining links in the trunk. The
trunk remains operable as long as there is at least one link in operation. If a
link is restored, that link is automatically included in the traffic distribution
again. The LACP option also offers a standby link capability, which enables
you to keep links in reserve for service if one or more of the original active
links fails. See "Trunk Group Operation Using LACP" on page 12-18.)
Maximum Trunk Groups Supported
Up to 36 Trunk Groups*
Up to 25 Trunk Groups*