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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
129
4.5 Link Aggregation
Ports can be combined into an aggregate connection. Trunks can be manually set up or dynamically configured using IEEE
802.3-2005 (formerly IEEE 802.3ad) Link Aggregation Control Protocol (LACP). The additional ports dramatically increase the
throughput across any connection, and provide redundancy by taking over the load if a port in the trunk should fail. The
Managed Switch supports up to 12 trunks.
This section has the following items:
Trunk Information
Displays trunk connection status
Trunk Configuration
Configures trunk connection settings
Trunk Membership
Specifies ports to group into static trunks
LACP
Link Aggregation Control Protocol
• Configuration
Allows ports to dynamically join trunks
• Aggregation Port
Configures parameters for link aggregation group members
• Port Counters Information
Displays statistics for LACP protocol messages
• Port Internal Information
Displays settings and operational state for the local side
• Port Neighbors Information
Displays settings and operational state for the remote side
Trunk Broadcast Control
Sets the broadcast storm threshold for each trunk
You can create multiple links between devices that work as one virtual, aggregate link. A port trunk offers a dramatic increase in
bandwidth for network segments where bottlenecks exist, as well as providing a fault-tolerant link between two devices. You can
create up to 5/12 trunks at a time.
The Managed Switch supports both static trunking and dynamic Link Aggregation Control Protocol (LACP). Static trunks
have to be manually configured at both ends of the link, and the switches must comply with the Cisco EtherChannel standard.
On the other hand, LACP configured ports can automatically negotiate a trunked link with LACP-configured ports on another
device. You can configure any number of ports on the switch as LACP, as long as they are not already configured as part of a
static trunk. If ports on another device are also configured as LACP, the Managed Switch and the other device will negotiate a
trunk link between them. If an LACP trunk consists of more than eight ports, all other ports will be placed in a standby mode.
Should one link in the trunk fail, one of the standby ports will automatically be activated to replace it.
Command Usage
Besides balancing the load across each port in the trunk, the other ports provide redundancy by taking over the load if a port in
the trunk fails. However, before making any physical connections between devices, use the web interface or CLI to specify the
trunk on the devices at both ends. When using a port trunk, take note of the following points:
• Finish configuring port trunks before you connect the corresponding network cables between switches to avoid creating a
loop.
• You can create up to 12 trunks on a Managed Switch, with up to eight ports per trunk.
• The ports at both ends of a connection must be configured as trunk ports.