HP ProCurve 6108, Management And Configuration Manual

Page: 185 / 547

Optimizing Traffic Flow with Port Controls, Port Trunking, and Port-Based Priority
Port Trunking
N o t e
Link Connections. The switch does not support port trunking through an
intermediate, non-trunking device such as a hub, or using more than one media
type in a port trunk group. Similarly, all links in the same trunk group must
have the same speed, duplex, and flow control.
Port Security Restriction. Port security does not operate on a trunk group.
If you configure port security on one or more ports that are later added to a
trunk group, the switch will reset the port security parameters for those ports
to the factory-default configuration.
C a u t i o n
To avoid broadcast storms or loops in your network while configuring a
trunk, first disable or disconnect all ports you want to add to or remove from
the trunk. After you finish configuring the trunk, enable or re-connect the
ports.
Port Trunk Features and Operation
The switch offers these options for port trunking:
■
LACP (IEEE 802.3ad—page 10-24)
■ Trunk (non-protocol—page 10-31)
■
FEC (Fast EtherChannel®—page 10-31)
The switch supports six trunk groups of up to four ports each. (Using the Link
Aggregation Control Protocol—LACP—option, you can include standby
trunked ports in addition to the maximum of four actively trunking ports.)
L A C P N o t e
LACP operation requires full-duplex (FDx) links. 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);
10FDx , 100FDx , and 1000FDx settings.
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 10-24.)
10-11