Configuring Ethernet Ports Ethernet Ports Overview
OmniSwitch AOS Release 6 Network Configuration Guide September 2009 page 1-9
Flow Control and Autonegotiation
PAUSE frames are used to pause the flow of traffic between two connected devices when traffic conges-
tion occurs. Flow control provides the ability to configure whether or not the switch will transmit and/or
honor PAUSE frames on an active interface. This feature is supported on standalone OmniSwitch 6400,
OmniSwitch 6850, and OmniSwitch 6855 switch interfaces configured to run in full-duplex mode. An
OmniSwitch chassis-based switch or a stack of switches will honor and process receive PAUSE frames
but do not transmit any such frames.
In addition to configuring flow control settings, this feature also works in conjunction with autonegotia-
tion to determine operational transmit/receive settings for PAUSE frames between two switches. Note that
the operational settings, as shown in the following table, override the configured settings as long as auto-
negotiation and flow control are both enabled for the interface:
If autonegotiation is disabled, the configured flow control settings are applied to the local interface. See
“Configuring Flow Control on Non-Combo Ports” on page 1-19 and “Configuring Flow Control on
Combo Ports” on page 1-27 for more information.
Configured
Local Tx
Configured
Local Rx
Configured
Remote Tx
Configured
Remote Rx
Operational
Local Tx
Operational
Local Rx
No No No No No No
Ye s Yes Ye s Yes Yes Ye s
Yes No Yes No No No
No Ye s No Yes Yes Ye s
No No No Yes No No
Ye s Yes No No No No
YesNoYesYesNoNo
No Ye s Yes No No Yes
No No Yes No No No
Ye s Yes No Ye s Yes Yes
YesNoNoNoNoNo
No Ye s Yes Yes Ye s Yes
No No Yes Yes No No
Ye s Yes Ye s No No No
YesNoNoYesYesNo
No Ye s No No No No
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