Linksys SRW208 - Manual (Page 85)

74 Chapter 5: Using the Web-based Utility for Configuration
Multicast Tab - IGMP Snooping
WebView Switches
• Backup. Provides a backup path to the designated port path toward the Spanning Tree leaves. Backup
ports occur only when two ports are connected in a loop by a point-to-point link. Backup ports also occur
when a LAN has two or more connections connected to a shared segment.
• Disabled. Indicates the port is not participating in the Spanning Tree.
Mode. Indicates the current Spanning Tree mode. The Spanning Tree mode is selected in the Global STP screen.
The possible field values are:
• Classic STP. Indicates that Classic STP is enabled on the device.
• Rapid STP. Indicates that Rapid STP is enabled on the device.
• Multiple STP. Indicates that Multiple STP is enabled on the device.
Interface Priority. Defines the interface priority for specified instance. The default value is 128.
Path Cost. Indicates the port contribution to the Spanning Tree instance. The range should always be 1-
200,000,000.
Designated Bridge ID. Indicates that the bridge ID number that connects the link or shared LAN to the root.
Designated Port ID. Indicates that the Port ID number on the designated bridge that connects the link or the
shared LAN to the root.
Designated Cost. Indicates that the default path cost is assigned according to the method selected on the
Spanning Tree Global Settings screen.
Forward Transitions. Indicates the number of times the port has changed from Forwarding state to Blocking
state.
Remaining Hops. Indicates the hops remaining to the next destination.
Multicast Tab - 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?