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CHAPTER 5: WEB MANAGEMENT
Port trunk allows multiple links to be bundled together and act as a single physical link for increased throughput. It provides load
balancing,and redundancy of links in a switched inter-network. The link does not have an inherent total bandwidth equal to the sum of
its component physical links. Traffic in a trunk is distributed across an individual link within the trunk in a deterministic method that
called a hash algorithm. The hash algorithm automatically applies load balancing to the ports in the trunk. A port failure within the
trunk group causes the network traffic to be directed to the remaining ports. Load balancing is maintained whenever a link in a trunk
is lost or returned to service.
Aggregation/Trunking Configuration
To assign the ports to a trunk, click on the ports that you would like to set as the same aggregation/trunking group, and click the
Apply button to save the settings you’ve made.
5.2.5 CONFIGURATION — IGMP SNOOPING
FIGURE 5-10. IGMP CONFIGURATION SCREEN
IGMP Snooping is the process of listening to IGMP network traffic. IGMP Snooping, as implied by the name, is a feature that allows
a Layer 2 switch to “listen in” on the IGMP conversation between hosts and routers by processing the layer3 IGMP packets sent in a
multicast network.
When IGMP Snooping is enabled in a switch, it analyzes all IGMP packets between hosts connected to the switch and multicast
routers in the network. When a switch hears an IGMP report from a host for a given multicast group, the switch adds the host’s port
number to the multicast list for that group. When the switch hears an IGMP Leave, it removes the host’s port from the table entry.
Prevents flooding of IP multicast traffic, and limits bandwidth intensive video traffic to only the subscribers.
IGMP Enabled: When enabled, the switch will monitor network traffic to determine which hosts want to receive multicast traffic.
Router Ports: Set if ports are connecting to the IGMP administrative routers.
Unregistered IPMC Flooding enabled: Set the forwarding mode for unregistered (not-joined) IP multicast traffic. The traffic will flood when
enabled and forward to router-ports only when disabled.
IGMP Snooping Enabled: When enabled, the port will monitor network traffic to determine which hosts want to receive the multicast traffic.
IGMP Querying Enabled: When enabled, the port can serve as the Querier, which is responsible for asking hosts if they want to receive
multicast traffic.
