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Syslog
Timestamp can be added to log messages where the SNTP feature is enabled and the SNTP
server is available. Also, internal system log messages can be copied to a remote Syslog server.
Log messages can be viewed in a reverse chronological order whereby the latest message is
shown first.
Web Quick Start
Provides a quick and simple method of putting a BayStack 5500 Switch into an initial setup
mode via a single screen. This makes it easier for network administrators to set up the switch.
Port shaping
Port shaping offers the ability to limit traffic on each port. While traffic policing is needed to
provide different levels of service to data streams on the ingress ports, traffic shaping is needed
to smooth the traffic from the egress ports. BayStack 5520 supports port-based traffic shaping.
Enterprises working with service providers or carriers utilize this feature when they are deploy-
ing Ethernet in place of the traditional Frame Relay, ISDN, or ATM WAN access solutions.
802.1x Enhancements (Multiple Hosts/Multiple Authentication and Guest VLAN)
With the multiple hosts/multiple authentication feature, more than one user with unique
MAC addresses is allowed access to a port upon successful authentication. For example, in a
conference room, if multiple users connect to a hub which is connected to a BayStack 5520
switch port, all of the users can be authenticated and allowed access to the network. Another
example would be with an IP phone with an integrated three-port switch. Since there is a
MAC address for the IP phone and a MAC address for the PC, without the multiple hosts/
multiple authentication feature, neither would be able to access the network using today's
single host/single authentication mechanism.
With the Guest VLAN feature, if a user connects to a BayStack 5520 switch port and is not
recognized to be authenticated on that port, that user will be placed into a Guest VLAN with
the settings as defined by the administrator. An example would be allowing a user to have
extranet access, but not intranet access. If a contractor or vendor connects to a port in your
network, that person will be placed into a Guest VLAN and have extranet access.
Multi-Link Trunking
Multi-Link Trunking (MLT) enables grouping of links between the BayStack 5520 and
another switch or server to provide greater bandwidth with active redundant links. Nortel
Networks unique Distributed Multi-Link Trunking (DMLT) feature allows trunked ports to
span multiple units of the stack for fail-safe connectivity to mission-critical servers and the
network center (Figure 4). BayStack 5000 Switches have been architected to support up to
32 trunks per switch or stack, with each trunk consisting of up to eight members per trunk.
Each trunk will be able to provide bandwidth of up to 16 Gbps. Currently, the BayStack
5000 Switches support up to six trunks per switch or stack, with each trunk consisting of up
to four members per trunk.
The Split Multi-Link Trunking (SMLT) feature of Passport 8600 eliminates single points of
failure in the network and allows wiring closet switches, such as the BayStack 5520, to have
multiple active connections to the network core. All links from a distributed multi-link trunk
can be active simultaneously. This allows customers to load-balance their network, double the
bandwidth, and use all the ports they have paid for.
By combining the reliability of the Passport 8600 with the BayStack 5520's resilient trunk-
ing features—including DMLT, MLT, and bi-directional FAST stacking, Nortel Networks
has created the next generation of flexible networking solutions. BayStack 5520 Switches are
architected to support SMLT and Inter Switch Trunk (IST) in the future.
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