Nortel BayStack 425-48T Brochure page 4

VLAN support
Up to 255 port-based VLANs can be established for each switch, to extend the broadcast
domain and segment network traffic for higher network efficiency. The 255 VLANs can be on a
standalone switch or across a stack. IEEE 802.1Q VLAN Trunking is supported on every port of
the switch, allowing efficient means of transporting broadcast domains across switches.
VLANs reduce administration costs by simplifying network moves, adds, and changes.
Enterprise-sized MAC address table
The BayStack 425 Switches support up to 8,000 MAC addresses to support ample scalability
for growing networks to accommodate many attached devices and workgroups connected to
each switch.
IGMP snooping
The BayStack 425 Switches feature IP Multicast support by examining ('snooping') all
Internet Group Multicast Protocol (IGMP) traffic in hardware at line rate, and filtering out
(dropping) unwanted IGMP packets such as PING from disrupting the network or end-
station performance.
Nortel Networks Command Line Interface (NNCLI)
The NNCLI is used to automate general management and configuration of BayStack 425
Switches. The NNCLI is used through a Telnet session or through the serial port on the
console.
ASCII configuration file
BayStack 425 Switches can download a user-editable ASCII configuration file from a Trivial
File Transfer Protocol (TFTP) server. The ASCII configuration file can be loaded automati-
cally at boot time or on-demand using the management systems (console menus or CLI).
Once downloaded, the configuration file automatically configures the switch or stack
according to the NNCLI commands in the file. This feature allows the flexibility of creating
command configuration files that can be used on several switches or stacks with minor
modifications.
ASCII configuration file generator
This feature works by reading the current configuration on the switch and generating the
appropriate NNCLI commands to recreate that configuration. Basically, it provides the ability
to view and store the switch configuration in a text, editable format. The generated file can be
stored on an external server and also used to restore the switch configuration.
IEEE 802.1p priority queuing
802.1p priority queuing is standards-based and enables priority to the order in which the
switch forwards packets on a per-port basis. For example, if messages from a specific segment
are crucial to the network, the switch port connected to that segment can be set to a higher
priority level. Up to four queues can be set on the BayStack 425 Switch with IEEE 802.1p.
Spanning Tree Protocol
Built-in support for Spanning Tree Protocol (IEEE 802.1D) detects and eliminates logical loops
in the network. When multiple paths exist, the switch will automatically place some ports on
standby to form a network with the most efficient traffic pathways, avoiding the continual
looping of frames.
Custom Auto Negotiation Advertisements (CANA)
This feature enables the network manager to tune the capabilities that a particular Ethernet
port can advertise via autonegotiation. The capabilities include half-duplex and full-duplex
modes with speeds of 10, 100, and 1000 Mbps. Autonegotiated Ethernet ports establish a
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