42CHAPTER 2: PORT CONFIGURATION

Example: Configuring the Default VLAN ID of the Trunk Port

In this example, the Ethernet Switch (Switch A) is connected to the peer (Switch B) through the trunk port Ethernet1/0/1. This example shows the default VLAN ID for the trunk port and verifies the port trunk pvid vlan command. As a typical application of the port trunk pvid vlan command, the trunk port will transmit the packets without tag to the default VLAN.

Figure 13 Configure the Default VLAN for a Trunk Port

Switch A

Switch B

The following configurations are used for Switch A, configure Switch B in a similar way:

1Enter the Ethernet port view of Ethernet1/0/1.

[SW7750]interface ethernet1/0/1

2Set the Ethernet1/0/1 as a trunk port and allow VLAN 2, 6 through 50, and 100 to pass through.

[SW7750-Ethernet1/0/1]portlink-type trunk

[SW7750-Ethernet1/0/1]port trunk permit vlan 2 6 to 50 100

3Create the VLAN 100.

[SW7750]vlan 100

4Configure the default VLAN ID of Ethernet1/0/1 as 100.

[SW7750-Ethernet1/0/1]port trunk pvid vlan 100

Troubleshooting VLAN If the default VLAN ID configuration fails, take the following steps:

Port Configuration

1Execute the display interface or display port command to check if the port is a trunk port or a hybrid port. If it is neither of them, configure it as a trunk port or a hybrid port.

2Configure the default VLAN ID.

Configuring Link

Link aggregation means aggregating several ports together to implement the

Aggregation

outgoing/incoming payload balance among the member ports and to enhance

 

connection reliability.

 

IEEE802.3ad-based link aggregation control protocol (LACP) implements dynamic

 

link aggregation and disaggregation and exchanges information with the peer

 

through LACP data unit (LACPDU). When LACP is enabled on it, the port notifies

 

the peer, by sending LACPDUs with the port’s system priority, system MAC, port

 

priority, port number and operation key.

 

When the peer receives this port information, it compares the received

 

information with the information stored at other ports to determine which ports

 

can be aggregated so that the two parties can agree on adding ports to, or

 

deleting ports from, a dynamic aggregation group.

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3Com 10014298 Configuring Link, Aggregation, Example Configuring the Default Vlan ID of the Trunk Port, Port Configuration