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Introduction
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remote network, the switch checks to see if it has the best route. If it does, it sends
its own MAC address to the host. The host then sends traffic for the remote
destination via the switch, which uses its own routing table to reach the destination
on the other network.
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 at Layer 2 and IGMP at Layer 3 to manage
multicast group registration.
Multicast Routing – Routing for multicast packets is supported by the Distance
Vector Multicast Routing Protocol (DVMRP) and Protocol-Independent Multicasting -
Dense Mode (PIM-DM). These protocols work in conjunction with IGMP to filter and
route multicast traffic. DVMRP is a more comprehensive implementation that
maintains its own routing table, but is gradually being replacing by most network
managers with PIM, Dense Mode and Sparse Mode. PIM is a very simple protocol
that uses the routing table of the unicast routing protocol enabled on an interface.
Dense Mode is designed for areas where the probability of multicast clients is
relatively high, and the overhead of frequent flooding is justified. While Sparse mode
is designed for network areas, such as the Wide Area Network, where the probability
of multicast clients is low. This switch currently supports DVMRP and PIM-DM. This
protocol works in conjunction with IGMP to filter and route multicast traffic.