Digi TransPort WR31 User Manual page 150

Configure network interfaces
Ethernet Hub group
On routers with a built-in hub/switch, the Ethernet Hub Group parameter for each port is
normally set to 0. This means that all ports belong to the same hub. If required however, the Hub
You can use the group parameter to isolate specific ports to create separate hubs. For example,
if Ethernet 0 and Ethernet1 have their Group parameter set to 0 and Ethernet 2 and Ethernet 3
have their Group parameter set to 1, the router is configured as two 2-port hubs instead of one 4-
port hub. This means that traffic on physical ports LAN 0 and LAN 1 is not visible to traffic on
physical ports LAN 2 and LAN 3 (and vice versa). Group numbers can be 0-3 or use 255 for an
interface to be in all groups. This parameter is not available on the web page when the router is
configured for Port Isolate mode.
Metric
The connected metric of an interface. Changing this value will alter the metric of dynamic routes
created automatically for this interface. The default metric of a connected interface is 1. By
allowing the interface to have a higher value (lower priority), static routes can take preference to
interface generated dynamic routes. For normal operation, leave this value unchanged.
MTU
The Maximum Transmit Unit for the specified interface. The default value is 0 meaning that the
MTU will either be 1504 (for routers using a Kendin Ethernet device) or 1500 (for non-Kendin
devices). The non-zero, values must be greater than 128 and not more than the default value.
Values must also be multiples of 4 and the router will automatically adjust invalid values entered
by the user. So, if the MTU is set to 1000, the largest IP packet that the router will send is 1000
bytes.
Enable auto-negotiation
Allows the router and the other Ethernet device it is connected to, to auto-negotiate the speed
and duplex of the Ethernet connection.
Speed (currently 100Base-T)
Selects either of the 10Base-T, 100Base-T, or Auto modes. The currently selected mode is
shown in brackets after the parameter name. Enabling Auto-negotiation and manually setting
the speed allows only the selected speed to be negotiated.
Duplex
Selects either of Full Duplex, Half Duplex or Auto mode. Enabling Auto-negotiation and
manually setting the Duplex will only allow the selected Duplex mode to be negotiated.
Max Rx rate
On models with multiple Ethernet interfaces, this parameter specifies a maximum data rate in
Kbps that the router receives on this interface. This may be useful in applications where
separate Ethernet interfaces are allocated to separate LANs and it is necessary to prioritize
traffic from one LAN over another.
Digi TransPort WR Routers User Guide
Configure Ethernet interfaces
150