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6-13
Optimizing Port Usage Through Traffic Control and Port Trunking
Port Trunking
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Table 6-5.
General Operating Rules for Port Trunks
Media:
All ports on both ends of a trunk group must have the same media type and mode (speed and duplex). The switch
blocks any trunked links that do not conform to this rule. (For the SMC6624M, SMC recommends leaving the port Mode
setting at
Auto
or, in networks using Cat 3 cabling,
Auto-10
.)
Port Configuration:
The default port configuration on the SMC6624M is Auto, which enables a port to sense speed and
negotiate duplex with an Auto-enabled port on another device. SMC 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.
All of the following operate on a per-port basis, regardless of trunk membership:
• Enable/Disable
• Flow control (Flow Ctrl)
• Broadcast limit (Bcast Limit) (Note that the switch automatically adjusts the Bcast Limit setting on individual ports in
the trunk to match the trunked port with the highest broadcast limit.) When a broadcast limit is configured on a trunk,
removing a port from the trunk sets the broadcast limit for that port to 0 (the default).
LACP is a full-duplex protocol. See “Trunk Group Operation Using LACP” on page 6-23.
Trunk Configuration:
All ports in the same trunk group must be the same trunk type (LACP or Trunk). All LACP ports in the
same trunk group must be either all static LACP or all dynamic LACP.
A trunk appears as a single port labeled
Dyn1
(for an LACP dynamic trunk)
or
Trk1
(for a static trunk of any type:
LACP or Trunk) 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 6-27.
For STP 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 STP 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 6-27.
SMC6624M> show interface config
Port Settings
Port Type
| Enabled Mode
Flow Ctrl
---- --------- + ------- ------------ ---------
1
10/100TX
| Yes
Auto
Disable
2
10/100TX
| Yes
Auto
Disable
Recommended Port Mode Setting for LACP