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PT-7728 User’s Manual Featured Functions
3-12
NOTE
After restoring the factory default configuration, you will need to use the default network settings
to re-establish the web or Telnet console connection with the PT-7728.
Using Port Trunking
Link aggregation involves grouping links to into a link aggregation group. A MAC client can treat
link aggregation groups as if they were a single link.
The PT-7728’s port trunking feature allows devices to communicate by aggregating up to 4 trunk
groups, with a maximum of 8 ports for each group. If one of the 8 ports fails, the other seven ports
will automatically provide backup and share the traffic.
Port trunking can be used to combine up to 8 ports between two PT-7728 switches. If all ports on
both switch units are configured as 100BaseTX and they are operating in full duplex, the potential
bandwidth of the connection will be 1600 Mbps.
The Port Trunking Concept
Moxa has developed a proprietary port trunking protocol that provides the following benefits:
y More flexibility in setting up your network connections, since the bandwidth of a link can be
doubled, tripled, or quadrupled
y Redundancy — if one link is broken, the remaining trunked ports share the traffic within this
trunk group
y Load sharing — MAC client traffic may be distributed across multiple links
To avoid broadcast storms or loops in your network while configuring a trunk, first disable or
disconnect all ports that you want to add to the trunk or remove from the trunk. After you finish
configuring the trunk, enable or re-connect the ports.
If all ports on both switch units are configured as 100BaseTX and they are operating in full duplex
mode, the potential bandwidth of the connection will be up to 1.6 Gbps. This means that users can
double, triple, or quadruple the bandwidth of the connection by port trunking between two PT
series switches.
Each PT-7728 can set a maximum of 4 port trunking groups. When you activate port trunking,
certain settings on each port will be reset to factory default values or disabled:
y Communication redundancy will be reset
y 802.1Q VLAN will be reset
y Multicast Filtering will be reset
y Port Lock will be reset and disabled.
y Set Device IP will be reset
y Mirror will be reset
After port trunking has been activated, you may configure these items again for each trunking
ports.