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Using the BayStack 410-24T 10BASE-T Switch
3-40
309985-A Rev 00
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 BayStack 410-24T switch 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 switch issues a signal to resume the transmission. You can choose
Symmetric or Asymmetric flow-control mode:
Symmetric Mode
This mode allows both the gigabit MDA port and its link partner to send
flow-control pause frames to each other. When a pause frame is received (by
either the gigabit MDA port or its link partner), the port suspends transmission of
frames for a number of slot times specified in the control frame or until a
pause-release control frame is received. Both devices on the link must support this
mode when it is selected.
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
3-40 for details about the two modes). Autonegotiation must be disabled for this
port when using this feature.
Default Value Disabled
Range Disabled, Symmetric, Asymmetric
Note:
The following two fields only appear when a (single MAC) MDA with a
separate redundant Phy port is installed.
Preferred Phy
Allows you to choose the preferred Phy port; the other Phy port reverts to
backup.
Default Value Right
Range Right, Left
Active Phy
Indicates the operational Phy port.
Default Value: None
Range: None, Right, Left
Table 3-15. High Speed Flow Control Configuration Screen Fields
(continued)
Field Description