Avaya 555-245-600 Manual Do Utilizador

A trunk port on an Ethernet switch is one that is capable of forwarding Ethernet frames on 
multiple VLANs through the mechanism of VLAN tagging. IEEE 802.1Q specifies the standard 
method for VLAN tagging. Cisco also uses a proprietary method called ISL. Avaya products do 
not interoperate with ISL.
A trunk link is a connection between two devices across trunk ports. This connection can be 
between a router and a switch, between two switches, or between a switch and an IP 
Telephone. Some form of trunking or forwarding multiple VLANs must be enabled to permit the 
IP Telephone and the attached personal computer to appear on separate VLANs. The 
commands in 

 enable trunking.

Note that Cisco and Avaya can remove VLANs from a trunk port. This is a highly desirable 
feature because only two VLANs at most should appear on a trunk port that is connected to an 
IP Telephone. That is, broadcasts from nonessential VLANs should not be permitted to bog 
down the link to the IP Telephone.

The default behavior of trunking is to permit all VLANs. In addition, the port does not need to be 
a trunk at all to forward multiple VLANs. 

To enable VLAN binding:

1. Verify that the port is configured with the desired port VLAN or native VLAN.

2. Add additional VLANs with one of the following VLAN-binding-mode options:

a. Put the port in bind-to-static mode by typing set port vlan-binding-mode <mod/port> 

static.

b. Statically add another VLAN in addition to the port VLAN or the native VLAN by typing 

set port static-vlan <mod/port> <vid>.

c. Add a VLAN to the configured VLAN list by typing set vlan <id>. 

d. Type show vlan to see entire list.

set trunk <mod/port> dot1q
By default, all VLANs (1 to 3071) 

are enabled on the trunk port. 

VLANs can be specified using 

VLAN binding commands.

set trunk <mod/port> nonegotiate dot1q
By default, all VLANs (1 to1005) are enabled 

on the trunk port. VLANs can be selectively 

removed with the command clear trunk 

<mod/port> <vid>.