Edge-Core ECS4660-28F, Руководство по управлению, Страница: 101 / 2020

C
HAPTER
1
| Introduction
Description of Software Features
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M
ULTICAST
F
ILTERING
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, MLD Snooping and Query
for IPv6, and IGMP at Layer 3 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.
L
INK
L
AYER
D
ISCOVERY
P
ROTOCOL
LLDP is used to discover basic information about neighboring devices
within the local broadcast domain. LLDP is a Layer 2 protocol that
advertises information about the sending device and collects information
gathered from neighboring network nodes it discovers.
Advertised information is represented in Type Length Value (TLV) format
according to the IEEE 802.1ab standard, and can include details such as
device identification, capabilities and configuration settings. Media
Endpoint Discovery (LLDP-MED) is an extension of LLDP intended for
managing endpoint devices such as Voice over IP phones and network
switches. The LLDP-MED TLVs advertise information such as network
policy, power, inventory, and device location details. The LLDP and LLDP-
MED information can be used by SNMP applications to simplify
troubleshooting, enhance network management, and maintain an accurate
network topology.
M
ULTICAST
R
OUTING
Routing for multicast packets is supported by the Protocol-Independent
Multicasting - Dense Mode and Sparse Mode (PIM-DM, PIM-SM, PIM6-DM,
PIM6-SM) protocols. These protocols work in conjunction with IGMP to filter
and route multicast traffic. 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.