Web Management Guide-R02

Chapter 1 | Introduction
Description of Software Features
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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.
Operation,
Administration, 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 for IPv4,and MLD Snooping and Query for IPv6 to manage multicast
group registration. It also supports Multicast VLAN Registration (MVR for IPv4)
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.