Link Aggregation Menu Screen (802.3ad Main Menu Screen)

Link Aggregation

It is desirable to have a way to use multiple interswitch links simultaneously to increase interswitch bandwidth. This can be done if both sides agree on a set of ports that are being used as an interswitch link called a “Trunk.” As long as both switches agree on which ports are in this trunk, there are no problems with looping, and the Spanning Tree can treat this trunk as a single port.

Proprietary Aggregation Methods

Most switch vendors provide a way to group these ports together manually. For example, the user could configure Ports 1, 2 and 3 in a trunk on switch X and connect to ports 4, 5 and 6 that are in a trunk on switch Y. By interconnecting the switches together, the effective bandwidth can be aggregated to the sum of the parts. The Enterasys Networks’ implementation is called SmartTrunking.

IEEE 802.3ad

All the methods of trunking multiple links have involved manually choosing the links that are part of the trunk. The IEEE 802.3ad specification allows the switch to determine which links are in trunks and configure them dynamically. Since the protocol is based on IEEE standards specifications, any switch from any vendor that supports this protocol can trunk links automatically.

How to Access

Use the arrow keys to highlight the LINK AGGREGATION MENU item in the Port Configuration Menu screen described in Section 5.1 and press ENTER. The 802.3ad MAIN MENU screen, Figure 5-8, displays.

Port Configuration Menu Screens 5-25

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Enterasys Networks 2H253, 2E253, 2H252, 2H258 manual Link Aggregation