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5-4
Chapter 5
Cajun P550/P880/P882 Switch User Guide
With Gigabit links, you can:
■ Enable IEEE802.3X for both send and receive (the “Enable”
setting)
■ Only send pause (XOFF/XON) signals (the “Enable – Send Only”
option)
■ Only respond to the pause signals (the “Enable – Respond Only”
option).
With 10/100 links you can use the "Enable with Aggressive Backoff"
option to enable Active Backpressure (creation of a collision) on a
link. Active Backpressure only applies to HD links so that when a
10/100 link is in FD, options 2 and 3 are identical.
Refer to Table5-1 lists the gigabit modules that do not support
autonegotiation:
* Note: If a Gigabit module that does not support the
autonegotiation is connected to a device that does,
disable autonegotiation to ensure proper operation.
If you enable flow control, the switch manages the inbound buffers
with flow control (IEEE 802.1X XOFF, or Backpressure) applied
when a high water mark is reached. thus, no matter which flow
control option is chosen, outgoing pauses or backpressure are only
applied to the port on which the parameter is set based upon the
inbound traffic for that port in the default queuing mode.
Table 5-1. Gigabit Modules not Supporting Autonegotiation
Gigabit Module Model Number Hardware Revision
M5502-1000SX-F M or earlier
M5502-1000LX-F M or earlier
M5502-1000SLX-F F or earlier
M5504-1000SX-F H or earlier
M5504-1000LX-F H or earlier
M5504-1000SLX-F H or earlier
M5502R-1000SX-F J or earlier
M5502R-1000LX-F J or earlier
M5502R-1000SLX-F H or earlier