D-Link 3312SR - Switch Spécifications télécharger pdf (Page 60)

DGS-3212SR Stackable Gigabit Layer 2 Switch

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 DGS-3212SR supports up to six port trunk groups with two to eight ports in each group. A potential bit rate of 8000

Mbps can be achieved.

Figure 4- 8. Example of Port Trunk Group

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.

NOTE: If any ports within the trunk group become disconnected, packets intended

for the disconnected port will be load shared among the other uplinked ports of the

link aggregation group.

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 six link aggregation groups, each group consisting of 2 to 8 links (ports). 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 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.

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D-Link 3312SR - Switch Spécifications Page 60