Alcatel OS-LS-6224 User Manual page 32

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Introduction
Traffic Prioritization – This switch prioritizes each packet based on the required
level of service, using eight priority queues with strict or Weighted Round Robin
Queuing. It uses IEEE 802.1p and 802.1Q tags to prioritize incoming traffic based on
input from the end-station application. These functions can be used to provide
independent priorities for delay-sensitive data and best-effort data.
This switch also supports several common methods of prioritizing layer 3/4 traffic to
meet application requirements. Traffic can be prioritized based on the priority bits in
the IP frame's Type of Service (ToS) octet or the number of the TCP/UDP port.
When these services are enabled, the priorities are mapped to a Class of Service
value by the switch, and the traffic then sent to the corresponding output queue.
Multicast Filtering – Specific multicast traffic can be assigned to its own VLAN to
ensure that it does not interfere with normal network traffic and to guarantee
real-time delivery by setting the required priority level for the designated VLAN. The
switch uses IGMP Snooping and Query to manage multicast group registration.
Virtual Cable Testing (VCT) – VCT detects and reports copper link cabling
occurrences, such as open cables and cable shorts.
MDI/MDIX Support – The device supports auto-detection between crossed and
straight-through cables. Standard wiring for end stations is Media-Dependent
Interface (MDI) and the standard wiring for hubs and switches is known as
Media-Dependent Interface with Crossover (MDIX).
Quality of Service (QoS) Support – Network traffic is usually unpredictable, and
the only basic assurance that can be offered is Best Effort traffic delivery. To
overcome this challenge, Quality of Service (QoS) is applied throughout the network.
This ensures that network traffic is prioritized according to specified criteria, and that
specific traffic receives preferential treatment. QoS in the network optimizes network
performance. The device supports the following QoS modes:
• Basic
• Advanced
Class Of Service 802.1p Support – The IEEE 802.1p signaling technique is an OSI
Layer 2 standard for marking and prioritizing network traffic at the data link/MAC
sub-layer. 802.1p traffic is classified and sent to the destination. No bandwidth
reservations or limits are established or enforced. 802.1p is a spin-off of the 802.1Q
(Vlans) standard. 802.1p establishes eight levels of priority, similar to the IP
Precedence IP Header bit-field.
Quality of Service Basic Mode – In the Basic QoS mode, it is possible to activate a
trust mode (to trust VPT, DSCP, TCP/UDP or none). In addition, a single Access
Control List can be attached to an interface.
Web Based Management – With web based management, the system can be
managed from any web browser. The system contains an Embedded Web Server
(EWS), which serves HTML pages, through which the system can be monitored and
configured. The system internally converts web-based input into configuration
commands, MIB variable settings and other management-related settings.
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