Cabletron Systems MMAC-Plus 9G536-04, Руководство пользователя, Страница: 17 / 42

1-5
Introduction
errors, to be copied and sent to an analyzer or RMON probe. The analyzer or
RMON probe will see the data as if it is directly connected to the LAN segment of
the source port.
Flow Control
Flow Control is a method of managing the ßow of frames between two devices. It
ensures that a transmitting device does not overwhelm a receiving device with
data. This enables the receiving device to communicate with the transmitting
device, and to have it pause its transmission while the receiving device processes
the frames already received. Flow control can be enabled or disabled on a port-by-
port basis. Both devices must support the IEEE 802.3x standard for ßow control to
work.
Frame based 802.3x ßow control is supported on all Ethernet ports operating in
the full duplex mode.
802.1p Port Priority
The IEEE 802.1p standard is used to assign a default priority to the frames
received without priority information in their tag header, and to map prioritized
frames to the appropriate transmit queues.
The default priority-to-queue mappings are shown in Table 1-1. This
conÞguration can be changed by the administrator.
Switching Options
The 9G536-04 provide IEEE Standard-based 802.1 switching or SecureFast
Switching Virtual Network Services. In the 802.1 mode (the default mode of
Table 1-1. Priority Queuing Configuration
Priority Indicator Transmit Queue
7 3
6 3
5 2
4 2
3 1
2 0
1 0
0 1