C
HAPTER
1
| Introduction
Description of Software Features
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frames when they enter the service provider’s network, and then stripping
the tags when the frames leave the network.
TRAFFIC
PRIORITIZATION
This switch prioritizes each packet based on the required level of service,
using eight priority queues with strict priority, Weighted Round Robin
(WRR), or a combination of strict and weighted 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 using DSCP, or
IP Precedence. 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.
QUALITY OF SERVICE Differentiated Services (DiffServ) provides policy-based management
mechanisms used for prioritizing network resources to meet the
requirements of specific traffic types on a per-hop basis. Each packet is
classified upon entry into the network based on access lists, IP Precedence
or DSCP values, or VLAN lists. Using access lists allows you select traffic
based on Layer 2, Layer 3, or Layer 4 information contained in each
packet. Based on network policies, different kinds of traffic can be marked
for different kinds of forwarding.
ETHERNET RING
PROTECTION
SWITCHING
ERPS can be used to increase the availability and robustness of Ethernet
rings, such as those used in Metropolitan Area Networks (MAN). ERPS
provides Layer 2 loop avoidance and fast reconvergence in Layer 2 ring
topologies, supporting up to 255 nodes in the ring structure. It can also
function with IEEE 802.1ag to support link monitoring when non-
participating devices exist within the Ethernet ring.
OPERATION,
A
DMINISTRATION, AND
MAINTENANCE
The switch provides OAM remote management tools required to monitor
and maintain the links to subscriber CPEs (Customer Premise Equipment).
This section describes functions including enabling OAM for selected ports,
loopback testing, and displaying remote device information.
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. It also supports Multicast VLAN Registration (MVR for IPv4 and
MVR6 for IPv6) which allows common multicast traffic, such as television
channels, to be transmitted across a single network-wide multicast VLAN
shared by hosts residing in other standard or private VLAN groups, while
preserving security and data isolation for normal traffic.
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