Data Sheet

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Flow Control

802.3x Flow Control implementation per IEEE 802.3

Annex 31B specications with Symmetric ow

control, Asymmetric ow control or No ow control

• Asymmetric ow control allows the switch to respond to received PAUSE frames, but the ports cannot

generate PAUSE frames

• Symmetric ow control allows the switch to both respond to, and generate MAC control PAUSE frames

Allows trafc from one device to be throttled for a

specied period of time: a device that wishes to in-

hibit transmission of data frames from another device

on the LAN transmits a PAUSE frame

• A device that wishes to inhibit transmission of data frames from another device on the LAN transmits a

PAUSE frame

The Priority Flow Control (PFC) is standardized by the

IEEE 802.1Qbb specication and enables ow control

per trafc class on IEEE 802 full-duplex links

• By pausing congested priorities independently, highly loss sensitive protocols can share the same link with

trafc that has different loss tolerances

• The priorities are differentiated by the priority eld of the 802.1Q VLAN header

• PFC uses a new control packet dened in 802.1Qbb and therefore disables 802.3x standard ow control on

PFC congured interfaces

• PFC comes with CLI conguration and it is only supported on M4300-12X12F, 24X, 24X24F, 48X and 96X

models

UDLD Support

UDLD implementation detects unidirectional links

physical ports (UDLD must be enabled on both sides

of the link in order to detect an unidirectional link)

• UDLD protocol operates by exchanging packets containing information about neighboring devices

• The purpose is to detect and avoid unidirectional link forwarding anomalies in a Layer 2 communication

channel

Both “normal-mode” and “aggressive-mode” are supported for perfect compatibility with other vendors implementations, including port “D-Disable” triggering cases in

both modes

M4300-96X

M4300-52G-PoE+

M4300-28G-PoE+

M4300-52G

M4300-28G

M4300-24X24F

M4300-12X12F

M4300-8X8F

M4300-48XF

M4300-24XF

M4300-16X

M4300-48X

M4300-24X

Intelligent Edge Managed Switches

Data Sheet | M4300 series

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