Data Sheet

Single Rate Policing feature enables support for Single
Rate Policer as defined by RFC 2697
• Committed Information Rate (average allowable rate for the class)
• Committed Burst Size (maximum amount of contiguous packets for the class)
• Excessive Burst Size (additional burst size for the class with credits refill at a slower rate than committed
burst size)
• DiServ feature applied to class maps
Automatic Voice over IP prioritization with protocol-based (SIP, H323 and SCCP ) or OUI-based Auto-VoIP up to 144 simultaneous voice calls
iSCSI Flow Acceleration and automatic protection / QoS with Auto-iSCSI
Flow Control
802.3x Flow Control implementation per IEEE 802.3
Annex 31B specifications with Symmetric flow
control, Asymmetric flow control or No flow control
• Asymmetric flow control allows the switch to respond to received PAUSE frames, but the ports cannot
generate PAUSE frames
• Symmetric flow control allows the switch to both respond to, and generate MAC control PAUSE frames
Allows trac from one device to be throttled for a
specified period of time: a device that wishes to inhibit
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
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
ProSAFE® Intelligent Edge Managed Switches Data Sheet
M4200 series
Page 10 of 31