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The Internet Group Management Protocol (IGMP) is a protocol of the Internet
Protocol (IP) suite. IP manages multicast traffic by using switches, routers, and hosts
that support IGMP. Enabling IGMP allows the switch to detect IGMP queries and
IGMP Report packets to manage IP multicast traffic through the switch. IGMP has
three fundamental types of message as follows:
Message Description
Query A message sent from the queries (IGMP router or switch)
asking for a response from each host belonging to a multicast
group.
Report A message sent by a host to the queries to indicate that the
host wants to be, or is a member of, a given group indicated
in the report message.
Leave Group A message sent by a host to the queries to indicate that the
host has quit being a member of a specific multicast group.
2.4.6.2 Static MAC Address
When you add a static MAC address, it remains in the switch's address table,
regardless of whether the device is physically connected to the switch. This saves
the switch from having to re-learn a device's MAC address after it has been
disconnected or powered-off from the network, and then reconnected at some time
later.
1. At the main menu, click administrator Filter Database Static MAC Addresses.
2. In the MAC address box, enter the MAC address to and from which the port
should permanently forward traffic, regardless of the devices network state.
3. In the Port Number box, enter a port number.
4. If tag-based (IEEE 802.1Q) VLAN’s are set up on the switch, static addresses are
associated with individual VLAN’s. Type the VID (tag-based VLAN’s) to associate
with the MAC address.
5. Click Add.