Port Trunking

Port Status and Configuration

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.

Interface Option

Dynamic LACP

Static LACP

Static Non-Protocol

 

Trunk Group

Trunk Group

or FEC Trunk Group

 

 

 

 

Menu Interface

No

Yes

Yes

CLI:

 

 

 

show trunk

No

Yes

Yes

show interfaces

No

Yes

Yes

show lacp

Yes

Yes

No

show spanning-tree

No

Yes

Yes

show igmp

No

Yes

Yes

show config

No

Yes

Yes

 

 

 

 

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

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