D
ESCRIPTION
OF
S
OFTWARE
F
EATURES
1-7
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 DSCP field in the IP frame. 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.
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) 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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