In the interface configuration mode, you can restore the settings of speed, duplexing, flow
control and auto-negotiation mode to the default values (auto-negotiation) by using the no
speed, no duplex, no flowcontrol and no negotiation mode commands. The following
example shows how to set the speed of Gigabitethernet 1/1 to 1000M, its duplex mode to full,
its flow control to off and its auto-negotiation mode to on.
Ruijie# configure terminal
Ruijie(config)# interface gigabitethernet 1/1
Ruijie(config-if)# speed 1000
Ruijie(config-if)# duplex full
Ruijie(config-if)# flowcontrol on
Ruijie(config-if)# end
Auto-negotiation status is not totally equivalent to
auto-negotiation mode. The auto-negotiation status on an
interface depends on the speed, duplex, flow control and
auto-negotiation mode of the interface.
Generally, if any one of the attributes speed, duplexing and
flow-control is set to auto or the auto-negotiation mode is on for
the interface, the state of auto-negotiation is on, that is, the
auto-negotiation feature is enabled on the interface; Otherwise,
if all of them are set to non-auto, and the auto-negotiation mode
is off for the interface, the state of auto-negotiation is off, that is,
the auto-negotiation feature is disabled.
As for 100M fiber ports, the auto-negotiation feature is always
disabled, that is, the state of auto-negotiation for 100M fiber
ports is always off. As for 1000M copper ports, the
auto-negotiation feature is always enabled, that is, the state of
auto-negotiation for 1000M copper ports is always on.
For S29E series switches, flow control does not take effect on
cross-chips and cross-stacks. Therefore, pay attention to
cross-chips and cross-stacks when configuring flow control.
Configuring Interface MTU
When a heavy throughput of data interchange occurs on a port, there may be a frame beyond
the Ethernet standard frame length. This type of frame is called jumbo frame. A user can
control the maximum frame length that the port is allowed to receive and send by setting the
MTU.
MTU refers to the length of a valid data segment in a frame, excluding the overhead of Ethernet
encapsulation.
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