3com 5500-ei pwr Installation Instruction

 

1-5 

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

connectivity or trunk connectivity. 

 

A hybrid port allows the packets of multiple VLANs to be sent untagged, but a trunk port only allows the 

packets of the default VLAN to be sent untagged.  

 

The three types of ports can coexist on the same device.  

You can assign an Ethernet port to a VLAN to forward packets for the VLAN, thus allowing the VLAN on 

the current switch to communicate with the same VLAN on the peer switch. 

An access port can be assigned to only one VLAN, while a hybrid or trunk port can be assigned to 

multiple VLANs.  

 

Before assigning an access or hybrid port to a VLAN, create the VLAN first.  

 

An access port can belong to only one VLAN. Therefore, the VLAN an access port belongs to is also the 

default VLAN of the access port. A hybrid/trunk port can belong to multiple VLANs, so you should 

configure a default VLAN ID for the port. 

After a port is added to a VLAN and configured with a default VLAN, the port receives and sends 

packets in a way related to its link type. For detailed description, refer to the following tables: 

Table 1-1 Packet processing of an access port 

Receive the packet and tag 
the packet with the default 
VLAN tag. 

z 

If the VLAN ID is just the 
default VLAN ID, receive the 
packet. 

z 

If the VLAN ID is not the 
default VLAN ID, discard the 
packet. 

Strip the tag from the packet and 
send the packet.