RackSwitch G8000 Application Guide
Link Aggregation Control Protocol
Link Aggregation Control Protocol (LACP) is an IEEE 802.3ad standard for grouping several physical ports into one logical port (known as a dynamic trunk group or Link Aggregation group) with any device that supports the standard. Please refer to IEEE
The 802.3ad standard allows standard Ethernet links to form a single Layer 2 link using the Link Aggregation Control Protocol (LACP). Link aggregation is a method of grouping physi- cal link segments of the same media type and speed in full duplex, and treating them as if they were part of a single, logical link segment. If a link in a LACP trunk group fails, traffic is reas- signed dynamically to the remaining link(s) of the dynamic trunk group.
NOTE – LACP implementation in the Blade OS does not support the Churn machine, an option used to detect if the port is operable within a bounded time period between the actor
and the partner. Only the Marker Responder is implemented, and there is no marker protocol generator.
A port’s Link Aggregation Identifier (LAG ID) determines how the port can be aggregated. The Link Aggregation ID (LAG ID) is constructed mainly from the system ID and the port’s admin key, as follows:
System ID is an integer value based on the switch’s MAC address and the system priority assigned in the CLI.
Admin key
A port’s Admin key is an integer value
For example, consider two switches, an Actor (the G8000) and a Partner (another switch), as shown in Table
Table 4-1 Actor vs. Partner LACP configuration
Actor Switch | Partner Switch 1 |
|
|
Port 7 (admin key = 100) | Port 1 (admin key = 50) |
|
|
Port 8 (admin key = 100) | Port 2 (admin key = 50) |
|
|
In the configuration shown in Table
70 Chapter 4: Ports and Trunking | BMD00041, November 2008 |
