You may not want a port to advertise all supported speed and duplex modes in the following
situations:
• If a
network can support only a 10 Mb/s connection, you can configure a port to advertise
only 10 Mb/s capabilities. Devices that uses autonegotiation to connect to this port
connect at 10 Mb/s, even if both devices are capable of higher speeds.
• If you configure a port to advertise only 100 Mb/s full-duplex capability, the link becomes
active only if the link partner can autonegotiate a 100 Mb/s full-duplex connection. This
prevents mismatched speed or duplex settings if autonegotiation is disabled on the link
partner.
• For testing or network troubleshooting, you can configure a link to autonegotiate at a
particular speed or duplex mode.
Configuring CANA using ACLI
Use the auto-negotiation-advertisements command to configure CANA.
T
o configure port 5 to advertise the operational mode of 10 Mb/s and full duplex, enter the
following command:
auto-negotiation-advertisements port 5 10-full
The following example displays sample output for the auto-negotiation-advertisements
command to set port 5 to 10 Mb/s and full duplex.
auto-negotiation-advertisements command sample output
4548GT-PWR<config>#interface fastethernet 5
4548GT-PWR<config-if>#auto-negotiation-advertisements port 5 10-full
4548GT-PWR<config-if>#
Viewing current autonegotiation advertisements
To view the autonegotiation advertisements for the device, enter the following command:
show auto-negotiation-advertisements [port <portlist>]
The following example displays sample output for the show auto-negotiation-advertisements
command after port 5 is set to 10 Mb/s and full duplex.
show auto-negotiation-advertisements command sample output
4548GT-PWR#show auto-negotiation-advertisements port 5
Unit/Port Autonegotiation Advertised Capabilities
--------- ----------------------------------------------------------------
1/5 10Full
Custom Autonegotiation Advertisements
Configuration — System April 2011 43
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