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GS108T Smart Switch Software Administration Manual
4-20 Configuring Switching
v1.0, December 2007
The following RSTP port information is displayed. Except for the Interface and State fields, all
fields are configurable:
• Interface. Shows the port number.
• Path Cost. Specifies the cost of the port. Cost means the contribution of this port to the
cost of paths toward the spanning tree root that include this port. The switch uses this
value to determine which port is the forwarding port. If all other factors are equal, the path
with the lowest cost to the root bridge is the active path. The possible values are between 1
and 65535.
• Priority. Specifies the priority of the port. This is the value of the priority field contained
in the first octet of the port ID. The port with the lowest number has the highest priority.
The possible values are 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224,
and 240.
• Edge. Specifies whether the port is the edge port. Once configured as an edge port, the
port immediately transitions to the forwarding state. The possible values are:
– Yes. Specifies that the port is the edge port.
– No. Specifies that the port is not the edge port.
• P2P Force. Specifies whether the port is a point-to-point link. If you connect a port to
another port though a point-to-point link and the local port becomes a designated port, it
negotiates a rapid transition with the other port to ensure a loop-free topology. The
possible values are:
– Yes. Specifies that the port is a point-to-point link.
– No. Specifies that the port is not a point-to-point link.
• State. Shows the RSTP port status.
3. Click Apply to confirm any settings changes.
Multicast
You can configure IGMP snooping, static multicasting, and multicast group membership.
IGMP Snooping
IGMP specifies how a host can register to a router to receive specific multicast traffic. Configure
the switch to use IGMP snooping in subnets that receive IGMP queries from either IGMP or the
IGMP snooping querier. IGMP snooping constrains multicast traffic at Layer 2 by configuring
Layer 2 LAN ports dynamically to forward multicast traffic only to those ports that want to receive
it. IGMP is a standard defined in RFC1112 for IGMPv1 and in RFC2236 for IGMPv2.