Chapter 5 | Configuration Using the |
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
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
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.
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
IGMP Status Select this option to enable IGMP snooping on the VLAN. Default is disabled (option not selected).
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