Cisco Systems WSC2960X48TDL Manual de usuario descargar pdf (Pagina 34)

The 1000BASE-x (where -x is -BX, -CWDM, -LX, -SX, and -ZX) SFP module ports support the

nonegotiate keyword in the speed interface configuration command. Duplex options are not

supported.

◦

The 1000BASE-T SFP module ports support the same speed and duplex options as the

10/100/1000-Mb/s ports.

For information about which SFP modules are supported on your switch, see the product release notes.

•

If both ends of the line support autonegotiation, we highly recommend the default setting of auto

negotiation.

•

If one interface supports autonegotiation and the other end does not, configure duplex and speed on both

interfaces; do not use the auto setting on the supported side.

•

When STP is enabled and a port is reconfigured, the switch can take up to 30 seconds to check for loops.

The port LED is amber while STP reconfigures.

Changing the interface speed and duplex mode configuration might shut down and re-enable the interface

during the reconfiguration.

Caution

IEEE 802.3x Flow Control

Flow control enables connected Ethernet ports to control traffic rates during congestion by allowing congested

nodes to pause link operation at the other end. If one port experiences congestion and cannot receive any more

traffic, it notifies the other port by sending a pause frame to stop sending until the condition clears. Upon

receipt of a pause frame, the sending device stops sending any data packets, which prevents any loss of data

packets during the congestion period.

The switch ports can receive, but not send, pause frames.Note

You use the flowcontrol interface configuration command to set the interface’s ability to receive pause frames

to on, off, or desired. The default state is off.

When set to desired, an interface can operate with an attached device that is required to send flow-control

packets or with an attached device that is not required to but can send flow-control packets.

These rules apply to flow control settings on the device:

•

receive on (or desired): The port cannot send pause frames but can operate with an attached device that

is required to or can send pause frames; the port can receive pause frames.

•

receive off: Flow control does not operate in either direction. In case of congestion, no indication is

given to the link partner, and no pause frames are sent or received by either device.

For details on the command settings and the resulting flow control resolution on local and remote ports,

see the flowcontrol interface configuration command in the command reference for this release.

Note

Catalyst 2960-X Switch Interface and Hardware Component Configuration Guide, Cisco IOS Release 15.0(2)EX

22 OL-29034-01

Configuring Interface Characteristics

IEEE 802.3x Flow Control

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 107 108

Comentarios a estos manuales

Sin comentarios

Cisco Systems WSC2960X48TDL Manual de usuario Pagina 34

Comentarios a estos manuales

Relacionado con productos y manuales para Software Cisco Systems WSC2960X48TDL