HP ProCurve 6400cl Series Management And Configuration Manual page 251

Table 12-3. General Operating Rules for Port Trunks
Media: For proper trunk operation, all ports on both ends of a trunk group must have the same media type and mode
(speed and duplex). (For the switches covered by this guide, HP recommends leaving the port Mode setting at
in networks using Cat 3 cabling,
Port Configuration: The default port configuration is Auto, which enables a port to sense speed and negotiate duplex with
an Auto-Enabled port on another device. HP recommends that you use the Auto setting for all ports you plan to use for
trunking. Otherwise, you must manually ensure that the mode setting for each port in a trunk is compatible with the other
ports in the trunk.
Figure 12-2. Recommended Port Mode Setting for LACP
All of the following operate on a per-port basis, regardless of trunk membership:
• Enable/Disable
• Flow control (Flow Ctrl)
LACP is a full-duplex protocol. Refer to "Trunk Group Operation Using LACP" on page 12-18.
Trunk Configuration: All ports in the same trunk group must be the same trunk type (LACP, Trunk or, on the 5300xl only,
FEC). All LACP ports in the same trunk group must be either all static LACP or all dynamic LACP.
Note: FEC trunking is not available on the Series 3400cl and Series 6400cl switches.
A trunk appears as a single port labeled
Trunk or, on the 5300xl only, FEC) on various menu and CLI screens. For a listing of which screens show which trunk types,
see "How the Switch Lists Trunk Data" on page 12-26.
For spanning-tree or VLAN operation, configuration for all ports in a trunk is done at the trunk level. (You cannot separately
configure individual ports within a trunk for spanning-tree or VLAN operation.)
Traffic Distribution: All of the switch trunk protocols use the SA/DA (Source Address/Destination Address) method of
distributing traffic across the trunked links. See "Outbound Traffic Distribution Across Trunked Links" on page 12-26.
Auto-10
.)
Dyn1 (for an LACP dynamic trunk) or Trk1
Trunk Configuration Methods
Recommended Port Mode Setting for LACP
(for a static trunk of any type: LACP,
Port Trunking
Auto
or,
12-7