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Optimizing Traffic Flow with Port Controls, Port Trunking, and Port-Based Priority
Port Trunking
■ Depending on the capabilities of the device on the other end of the trunk,
negotiate the forwarding mechanism on the trunk to the non-protocol
option.
■ When auto-negotiated to the SA/DA forwarding mechanism, provide
higher performance on the trunk for broadcast, multicast, and flooded
traffic through distribution in the same manner as non-protocol trunking.
■ Support FEC automatic trunk configuration mode on other devices. That
is, when connecting FEC trunks to FEC-capable servers, switches, or
routers having FEC automatic trunk configuration mode enabled, the
FEC trunks allow these other devices to automatically form trunk groups.
How the Switch Lists Trunk Data
Static Trunk Group: Appears in the menu interface and the output from the
CLI show trunk and show interfaces commands.
Dynamic LACP Trunk Group: Appears in the output from the CLI show lacp
command.
Outbound Traffic Distribution Across Trunked Links
All three trunk group options (LACP, Trunk, and FEC) use source-destination
address pairs (SA/DA) for distributing outbound traffic over trunked links.
SA/DA (source address/destination address) causes the switch to distribute
outbound traffic to the links within the trunk group on the basis of source/
destination address pairs. That is, the switch sends traffic from the same
Interface Option Dynamic LACP
Trunk Group
Static LACP
Trunk Group
Static Non-Protocol
or FEC Trunk Group
Menu Interface No Yes Yes
CLI show trunk No Yes Yes
CLI show interfaces No Yes Yes
CLI show lacp Yes Yes No
CLI show spanning-tree No Yes Yes
CLI show igmp No Yes Yes
CLI show config No Yes Yes
!Software.book Page 32 Thursday, October 10, 2002 6:10 PM
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