3com S7906E Manuel De Montage

 

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Before creating a VLAN interface for a VLAN, create the VLAN first. 

 

Port-based VLANs group VLAN members by port. A port forwards traffic for a VLAN only after it is 

assigned to the VLAN. 

You can configure the link type of a port as access, trunk, or hybrid. The three link types use different 

VLAN tag handling methods. When configuring the link type of a port, note that:  

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An access port can belong to only one VLAN. Usually, ports directly connected to PCs are 

configured as access ports.  

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A trunk port can carry multiple VLANs to receive and send traffic for them. Except traffic of the 

default VLAN, traffic passes through a trunk port will be VLAN tagged. Usually, ports connecting 

network devices are configured as trunk ports to allow members of the same VLAN to 

communicate with each other across multiple network devices.  

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Like a trunk port, a hybrid port can carry multiple VLANs to receive and send traffic for them. Unlike 

a trunk port, a hybrid port allows traffic of all VLANs to pass through VLAN untagged. You can 

configure a port connected to a network device or user terminal as a hybrid port for access link 

connectivity or trunk connectivity.  

By default, VLAN 1 is the default VLAN for all ports. You can configure the default VLAN for a port as 

required.  

Use the following guidelines when configuring the default VLAN on a port: 

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Because an access port can join only one VLAN, its default VLAN is the VLAN to which it belongs 

and cannot be configured. 

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Because a trunk or hybrid port can join multiple VLANs, you can configure a default VLAN for the 

port. 

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You can use a nonexistent VLAN as the default VLAN for a hybrid or trunk port but not for an 

access port. Therefore, after you remove the VLAN that an access port resides in with the undo 

vlan command, the default VLAN of the port changes to VLAN 1. The removal of the VLAN 

specified as the default VLAN of a trunk or hybrid port, however, does not affect the default VLAN 

setting on the port.