Overview1-3Switch Architecture
The VDSL Switch-VS2512A employs a wire-speed, non-blocking switchi ng fabric.
This permits simultaneous wire-speed transport of multiple packets at low latency on
all ports. This switch also features full-duplex capability on a ll ports, which effectively
doubles the bandwidth of each connection.
Management Options
This switch contains a comprehensive array of LEDs for “at-a-glance” monitoring of
network and port status. It also includes a built-in network management agent that
allows the switch to be managed in-band using S NMP or RMON (Groups 1, 2, 3 and
9) protocols, with a Web browser, or remotely via Telnet. The switch also provides an
RS-232 serial port (DB-9 connector) on the front panel for out-of-ba nd management.
A PC may be connected to this port
for configuration and monitoring ou t-of-band via a
null-modem cable. (See Appendix B for wiring options.)
This switch provides a wide range of advanced performance-enhan cing features.
Port-based and tagged VLANs, plus support for automatic GVRP VLAN registration
provides traffic security and efficient use of network bandwidth. QoS priority
queueing ensures the minimum delay for moving real-time multimedia data across
the network. Flow control eliminates the loss of packets due to bottlenecks caus ed
by port saturation. Broadcast storm control prevents broadcast traffic storms fr om
engulfing the network. Some of this switch’s advanced features are described below.
For a detailed description, refer to the Management Guide.
VLANs
The VDSL Switch-VS2512A supports up to 255 VLANs. A Virtual LAN is a collection
of network nodes that share the same collision domain regardless of the ir physical
location or connection point in the network. By segmenting your network into
VLANs, you can:
• Eliminate broadcast storms which severely degrade performance in a flat network.
• Simplify network management for node changes/moves by remotely configuring
VLAN membership for any port, rather than having to ma nually change the node’s
IP address.
Multicast Switching
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 setti ng
the required priority level for the designated VLAN. The switch uses IGMP Snooping
to manage multicast group registration.