User manual
18
wEb-bASED bROwSER MANAGEMENT
ARL TABLE
This screen allows you to view MAC addresses of the MAC address table.
MAC Address: XX-XX-XX-XX-XX-XX, where XX ranges 0 to FF. Default: 00-00-
00-00-00-00. Species the MAC address to search for.
Search: Click to start searching for the specied MAC address.
NOTE: The MAC address table consists of static addresses, dynamic addresses
and the device address.
MULTICAST CONFIGURATION
IGMP (Internet Group Management Protocol) is used by IP hosts to report their
host group memberships to multicast routers. As hosts join and leave specic
multicast groups, streams of trafc are directed to or withheld from that host. The
IGMP protocol operates between multicast routers and IP hosts. When an
unmanaged switch is placed between multicast routers and their hosts, the multicast
streams will be distributed to all ports. This may introduce signicant trafc onto
ports that do not require it and receive no benet from it.
A device with IGMP Snooping enabled will act upon IGMP messages sent from the
router and the host, restricting trafc streams to the appropriate LAN segments.
The following gure provides a simple example of IGMP use. One “producer” IP
host (P1) is generating two IP multicast streams, M1 and M2. There are four
potential “consumers” of these streams, C1 through C4. The multicast router
discovers which host wishes to subscribe to which stream by sending general
membership queries to each of the segments.
In this example, the general membership query sent to the C1-C2 segment is
answered by a membership report (also referred to as a “join”) indicating the desire
to subscribe to stream M2. The router will forward the M2 stream onto the C1-C2
segment. In a similar fashion, the router discovers that it must forward M1 onto
segment C3-C4.