Users Guide

Adjusting the Keepalive Timer
To change the time interval between keepalive messages on the interfaces, use the keepalive command.
The interface sends keepalive messages to itself to test network connectivity on the interface.
To change the default time interval between keepalive messages, use the following command.
• Change the default interval between keepalive messages.
INTERFACE mode
keepalive [seconds]
• View the new setting.
INTERFACE mode
show config
Provisioning Combo Ports
In S3100 series switches, two combo ports of 1G SFP are available. By default, the combo ports are in Hybrid
mode. You can provision the combo ports to act as a copper or fiber medium.
In S3100 series, the speed and negotiation auto commands are not available on the combo ports in the
Hybrid mode. To apply these commands on combo ports, the ports need to be provisioned as an individual
medium. You can use the combo-port-type command to provision the combo ports as copper or fiber
medium.
Dell(conf-if-gi-1/23)# combo-port-type copper
Dell(conf-if-gi-1/23)# combo-port-type fiber
When a port is provisioned as copper, you can configure all the supported speeds on a copper interface (10M,
100M, 1G). Whenever there is a change in provisioning, all the existing configurations on the port are deleted.
This ensures that stale configurations, that are not applicable for a specific medium, are not present on the
port. When the configurations are deleted, a confirmation message is displayed and you can choose whether
to delete them or not.
When combo ports are in Auto or Hybrid mode, the S3100 switch assumes the presence of SFP as fiber
medium and switches to fiber mode. When an empty SFP is inserted with a copper cable present, a few
copper-only commands are not accessible and the output of show commands might provide incorrect
information. It is recommended not to have SFP inserted when copper cable is used as active medium.
The following table describes how the speed and negotiation auto commands work with different
modes of a combo port:
Table 27. Behavior on Combo Ports
Mode Behavior of speed Behavior of negotiation auto
Auto/Hybrid Cannot be configured and an error
is displayed.
Cannot be configured and no error
is displayed.
Copper Can be configured. Can be configured.
Interfaces 411