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Redundant Links with STP

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There is a mismatch in trunking, duplex, and STP port priority. All of the
ports must be configured the same for EtherChannel to work.

To view the configuration of a port, use the show port capability

slot/port

command:

Todd5000> (enable) sh port cap 1/1

Model WS-X5509

Port 1/1

Type 100BaseTX

Speed 100

Duplex half,full

Trunk encap type ISL

Trunk mode on,off,desirable,auto,nonegotiate

Channel 1/1-2

Broadcast suppression percentage(0-100)

Flow control no

Security yes

Membership static,dynamic

Fast start yes

Rewrite no

Todd5000> (enable)

The preceding output shows the card model number and the configura-

tion of the port. The easiest way for us to make sure all the ports we want to
channel are configured the same is to just clear the configuration. We're not
suggesting that you just clear your config whenever any problems come up,
but the configuration we created in this chapter is pretty extensive, and it's
just easier to just clear it out of the switch to perform the next function:

Todd5000> (enable) clear config all

This command will clear all configuration in NVRAM.

This command will cause ifIndex to be reassigned on the
next system startup.

Do you want to continue (y/n) [n]? y

........

.................

System configuration cleared.

Console> (enable)

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