xStack
®
DES-3810 Series Layer 3 Managed Ethernet Switch Web UI Reference Guide
105
Link Aggregation
Understanding Port Trunk Groups
Port trunk groups are used to combine a number of
ports together to make a single high-bandwidth data
pipeline. The Switch supports up to fourteen port trunk
groups with two to eight ports in each group. A potential
bit rate of 800 Mbps can be achieved.
The Switch treats all ports in a trunk group as a single
port. Data transmitted to a specific host (destination
address) will always be transmitted over the same port
in a trunk group. This allows packets in a data stream to
arrive in the same order they were sent.
Link aggregation allows several ports to be grouped
together and to act as a single link. This gives a
bandwidth that is a multiple of a single link's bandwidth.
Link aggregation is most commonly used to link a
bandwidth intensive network device or devices, such as
a server, to the backbone of a network.
The Switch allows the creation of up to fourteen link
aggregation groups, each group consisting of 2 to 8
links (ports). The (optional) Gigabit ports can only
belong to a single link aggregation group.
Figure 5-38 Link Aggregation Example window
All of the ports in the group must be members of the same VLAN, and their STP status, static multicast, traffic
control; traffic segmentation and 802.1p default priority configurations must be identical. Port locking, port mirroring
and 802.1X must not be enabled on the trunk group. Further, the LACP aggregated links must all be of the same
speed and should be configured as full duplex.
The Master Port of the group is to be configured by the user, and all configuration options, including the VLAN
configuration that can be applied to the Master Port, are applied to the entire link aggregation group.
Load balancing is automatically applied to the ports in the aggregated group, and a link failure within the group
causes the network traffic to be directed to the remaining links in the group.
The Spanning Tree Protocol will treat a link aggregation group as a single link, on the switch level. On the port level,
the STP will use the port parameters of the Master Port in the calculation of port cost and in determining the state of
the link aggregation group. If two redundant link aggregation groups are configured on the Switch, STP will block
one entire group; in the same way STP will block a single port that has a redundant link.
NOTE:
If any ports within the trunk group become disconnected, packets intended for the disconnected port
will be load shared among the other linked ports of the link aggregation group.
Port Trunking Settings
On this page the user can configure the port trunk settings for the switch.
To view the following window, click
L2 Features > Link Aggregation > Port Trunking Settings
, as shown below:
Содержание xStack DES-3810
Страница 1: ......