Moxa Technologies PT-7728 user manual Using Port Trunking, Port Trunking Concept

PT-7728 User’s Manual		Featured Functions
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:

yMore flexibility in setting up your network connections, since the bandwidth of a link can be doubled, tripled, or quadrupled

yRedundancy — if one link is broken, the remaining trunked ports share the traffic within this trunk group

yLoad 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:

yCommunication redundancy will be reset

y802.1Q VLAN will be reset

yMulticast Filtering will be reset

yPort Lock will be reset and disabled.

ySet Device IP will be reset

yMirror will be reset

After port trunking has been activated, you may configure these items again for each trunking ports.

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