Using the Console Interface
309978-D Rev 01 3-63
Choosing a High Speed Flow Control Mode
The High Speed Flow Control feature allows you to control traffic and avoid
congestion on the gigabit full-duplex link. If the receive port buffer becomes full,
the gigabit MDA issues a flow-control signal to the device at the other end of the
link to suspend transmission. When the receive buffer is no longer full, the MDA
issues a signal to resume the transmission.
Table 3-21. High Speed Flow Control Configuration Screen Fields
Field Description
Unit Allows you to select the unit number (when stacking is configured) to view or
configure. To view or configure another unit, type its unit number and press
[Enter], or press the spacebar to toggle the unit numbers (the system displays a
screen only for units that are configured with a gigabit MDA).
Autonegotiation When enabled, the port advertises support only for 1000 Mb/s operation, in
full-duplex mode.
Default Enabled
Range Enabled, Disabled
Flow Control Allows you to control traffic and avoid congestion on the gigabit MDA port. Two
modes are available (see “Choosing a High Speed Flow Control Mode” on
page 3-63 for details about the two modes). The Flow Control field cannot be
configured unless you set the Autonegotiation field value to Disabled.
Default Disabled
Range Disabled, Symmetric, Asymmetric
Note: The following two fields appear only when a (single MAC) MDA with a
separate redundant Phy port is installed.
Preferred Phy Allows you to choose a preferred Phy port; the other Phy port reverts to backup.
Default Right
Range Right, Left
Active Phy Indicates the operational Phy port.
Default None
Range None, Right, Left
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