Switch User Manual

Chapter 5
Advanced Configuration
46
8-Port 10/100 Ethernet Switch with Webview
Root • Provides the lowest cost path to forward packets
to root device.
Designated • Indicates the port or LAG via which the
designated device is attached to the LAN.
Alternate • Provides an alternate path to the root
device from the root interface.
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 > 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.
Enable IGMP Snooping Indicates if IGMP Snooping is
enabled on the device. IGMP Snooping can be enabled
only if Bridge Multicast Filtering is enabled.
VLAN ID Specifies the VLAN ID.
IGMP Status Indicates if IGMP snooping is enabled on
the VLAN.
Auto Learn Indicates if Auto Learn is enabled on the
device. If Auto Learn is enabled, the device automatically
learns where other Multicast groups are located. Enables
or disables Auto Learn on the Ethernet device.
Host Timeout Indicates the amount of time host waits to
receive a message before timing out. The default time is
260 seconds.
MRouter Timeout Indicates the amount of the time the
Multicast router waits to receive a message before it times
out. The default value is 300 seconds.