Optimizing Traffic Flow with Port Controls, Port Trunking, and Filters

Port Trunking

Port Trunking

Port Status and Configuration Features

Feature

Default

Menu

CLI

Web

 

 

 

 

 

viewing port trunks

n/a

page 9-16

page 9-18

page 9-24

configuring a static trunk

none

page 9-16

page 9-22

group

 

 

 

 

configuring a dynamic LACP

LACP passive

page 9-23

trunk group

 

 

 

 

 

 

 

 

 

Port trunking allows you to assign up to four physical links to one logical link (trunk) that functions as a single, higher-speed link providing dramatically increased bandwidth. This capability applies to connections between backbone devices as well as to connections in other network areas where traffic bottlenecks exist. A trunk group is a set of up to four ports configured as members of the same port trunk. Note that the ports in a trunk group do not have to be consecutive. For example:

 

The multiple physical links in a trunk behave as one logical link

 

 

 

 

 

 

Switch 2:

Switch 1:

port c1

 

port a1

 

Ports c1 - c4

port c2

 

port a2

 

Ports a3 - a6

port c3

 

port a3

 

configured

 

 

configured as

port c4

 

port a4

 

as a port

 

 

a port trunk

port c5

 

port a5

 

trunk group.

 

 

group

port c6

 

port a6

 

 

 

 

 

 

port c7

 

port a7

 

 

 

. . .

 

. . .

 

 

 

port n

 

port n

 

 

 

 

 

 

 

 

Figure 9-5. Conceptual Example of Port Trunking

With full-duplex operation in a four-port trunk group, trunking enables the following bandwidth capabilities:

9-10