Nortel BayStack 460-24T-PWR Product Brief page 7

affecting the physical connectivity within
the network. The 'End Node Locate' tool
provides the ability to locate a failing end
node and, with one mouse click, have
access to the RMON statistics for the
failing Ethernet port supporting that end
node. These solutions provide visual and
statistical tools necessary to quickly resolve
any network event or to manage perform-
ance in real-time. The BayStack 460
Switches support "syslog" capability that
helps in troubleshooting network issues.
Quality of Service (QoS)
The BayStack 460 Switch's QoS feature
allows not just the efficient utilization of
bandwidth, optimizing existing network
resources and capabilities, but also the
provision of packet classification and
marking at the edge of the network,
simplifying the QoS deployment at the
aggregation and core of the network. By
classifying, prioritizing, policing, and
marking (DiffServ Code Point) LAN
traffic, networks can offer reliable connec-
tivity and required bandwidth for mission-
critical applications like IP telephony and
mission-critical data applications to specific
groups and users, and to individual devices.
For each of these applications, advanced
QoS features support Internet Engineering
Task Force (IETF) standard DiffServ QoS
architecture—a packet classification based
on the content of IP packet header fields
(voice, video, data), traffic policing, and
remote sniffing.
Queuing function
The BayStack 460 Switch provides network
availability for mission-critical applications,
devices, and users. This is performed by
classifying, prioritizing, and marking LAN
IP traffic using up to eight hardware-based
queues on every port including the stacking
ports based on the following parameters:
• MAC address-based filtering
• IP ToS/DSCP marking
• IP source address/destination address
or subnets
• TCP/UDP source/destination
port/port range
• IEEE 802.1p user priority bits
• Ingress source port
• IP Protocol ID (e.g. TCP, UDP, IGMP)
• EtherType (e.g. IP, IPX)
• IEEE 802.1Q VLAN ID
The BayStack 460 Switch also has the
ability to read packets that have been
marked from other devices such as the
Passport* 8600 Switch. Additionally,
weighted round robin prevents normal
priority traffic from being starved by
expedited traffic (on a per-packet basis).
QoS and Policy management
DiffServ QoS provides the ability to read,
alter, prioritize, tag, or mark IP packets
based upon information embedded in the
Type of Service (ToS) field. The level of
service can be marked in the embedded
information inside the ToS field of each IP
packet. DiffServ is based on the ToS field.
The BayStack 460 Switch has application-
specific integrated circuits (ASICs) to
enable the DiffServ Code Point (DSCP) to
be mapped to the IEEE 802.1p user prior-
ity bits to provide consistent QoS at Layer 3
(IP) and Layer 2 (Ethernet). The QoS poli-
cies can be configured via the BayStack 460
Switch's built-in Web-based management
tools to facilitate QoS or alternatively,
Optivity Policy Services can be utilized for
dynamic end-to-end enterprise-wide policy
and QoS management, facilitated through
the Common Open Policy Service (COPS)
protocol.
Quality of Service provisioning
With Optivity Policy Services, policies can
be created through a simple and intuitive
drag-and-drop workflow. Optivity Policy
Services is the Policy Decision Point in a
DiffServ QoS implementation.
Further benefits include:
• A simple intuitive policy creation
• The ability to re-use common filter sets
• The provision of a network-wide view
of policies currently in use
• The ability to avoid QoS provisioning
errors
• A centrally managed DSCP and 802.1p
queue mapping tables
• Saved time in provisioning the
network—as thousands of CLI or
Web transactions are reduced to a few
simple actions
Simplified QoS
The BayStack 460 Switch supports Nortel
Networks Service Classes (NNSCs) which
provide simplified QoS provisioning.
NNSCs provide factory-default QoS
configurations, eliminating the complexi-
ties often associated with QoS-enabled
network deployments.
NNSCs provide default settings such as:
• DSCP marking per class
• DiffServ forwarding behavior (PHB)
per class
• DSCP to queue mapping
• DSCP to 802.1p mapping
• Default scheduler per class
By classifying the traffic and placing it into
an NNSC, complex QoS configurations are
eliminated. NNSCs simplify the deploy-
ment of a QoS-enabled network with
Nortel Networks switching solutions. Using
the Web-based interface, select the NNSC
that best suits the type of traffic or applica-
tion being classified on each Nortel
Networks switching product and take
advantage of the default QoS settings. This
saves on provisioning time but most impor-
tantly, ensures that the QoS functions are
provisioned consistently across the network.
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