Linksys SLM224G4S - Manual (Page 42)

Chapter  Configuration Using the Web-based Utility
 24/48-Port 10/100 + 4-Port Gigabit Resilient Clustering Smart Switch with 2 Combo SFPs
Port Fast Indicates if Fast Link is enabled on the port.
If Fast Link mode is enabled for a port, the Port State
is automatically placed in the Forwarding state when
the port link is up. Fast Link optimizes the STP protocol
convergence. STP convergence can take 30-60 seconds in
large networks. The possible values are Enable, Auto, and
Disable. The default is Disable.
Port State Displays the current STP state of a port. If
enabled, the port state determines what forwarding
action is taken on traffic. Possible port states are:
Disabled STP is currently disabled on the port. The
port forwards traffic while learning MAC addresses.
Blocking The port is currently blocked and cannot
forward traffic or learn MAC addresses.
Listening The port is in Listening mode. The port
cannot forward traffic nor can it learn MAC addresses.
Learning The port is in Learning mode. The port
cannot forward traffic, but can learn new MAC
addresses.
Forwarding The port is in Forwarding mode. The port
can forward traffic and learn new MAC addresses.
Speed Displays the speed at which the port is operating.
Path Cost Indicates the port contribution to the root path
cost. The path cost is adjusted to a higher or lower value,
and is used to forward traffic when a path being rerouted.
The default value is 2000000 for a 10M port, 200000 for a
100M port, and 20000 for a 1G port or a LAG.
Default Path Cost When selected the default path cost is
implemented. The default is unselected.
Priority Priority value of the port. This value influences
the port choice when a bridge has two ports connected in
a loop. The range of values is 0 -240. The default is 128.
Designated Bridge ID Displays the bridge priority and
the MAC Address of the designated bridge.
Designated Port ID Displays the selected port’s priority
and interface.
Designated Cost Displays the cost of the port
participating in the STP topology. Ports with a lower cost
are less likely to be blocked if STP detects loops.
Forward Transitions Displays the number of times the
port has changed from the Blocking state to Forwarding
state.
Click Update to update the screen with your changes.
Click Save Settings to save the changes, or Cancel
Changes to cancel the changes.
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Multicast
Multicast configuration options include IGMP Snooping,
Bridge Multicast, and Bridge Multicast Forward All.
Multicast > IGMP Snooping
Multicast > IGMP Snooping
When IGMP Snooping is enabled globally, all IGMP packets
are forwarded to the CPU. The CPU analyzes the incoming
packets and determines:
Which ports want to join which Multicast groups
Which ports have Multicast routers generating IGMP
queries
Which routing protocols are forwarding packets and
Multicast traffic
Ports requesting to join a specific Multicast group issue an
IGMP report, specifying that Multicast group is accepting
members. This results in the creation of the Multicast
filtering database.
The Bridge Multicast Forward All screen contains two
sections, IGMP Global and VLAN IGMP Settings. These
sections and the fields they contain are described below.
IGMP Global
Enable IGMP Snooping Select this option to enable
IGMP Snooping on the device. IGMP Snooping can be
enabled only if Bridge Multicast Filtering is enabled. The
default is disabled (option not selected).
VLAN IGMP Settings
VLAN ID Select the VLAN ID from the drop-down menu.
IGMP Status Select this option to enable IGMP snooping
on the VLAN. Default is disabled (option not selected).
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