Specifications

Network Configuration Concepts
213
The default_vlan is VLAN1. The VLAN numbers are assigned names to help follow which
function is assigned to which VLAN. The voice_vlan is VLAN2, the video_vlan is VLAN3, and
test4 is VLAN4. The default VLAN is used by the data devices and also by the IP phones when
they first start up and look for their correct VLAN configuration. (See the section “Startup
Sequence for Phones” on page 230.)
The IP devices connected to the port examples above are
• Ports 1 though 4: Dual-port phones with PCs.
• Port 5: Interconnected network switches (only tagged data allowed within network).
• Port 6: Not used with this application. Untagged data on this link goes to VLAN4 only.
• Port 7: 3300 ICP controller, or similar voice applications such as a Mitel Speech Server
(formerly Speak@Ease).
• Ports 8 and 9: PCs.
• Port 10: Router with virtual ports (similar to a connection between switches).
• Port 11: Router port that physically separates VLANs (the data VLAN).
• Port 12: Router port that physically separates VLANs (the voice VLAN).
More details on configuring different HP network switches can be found in HP ProCurve
Networking IP Telephony Solution Design Guide and HP ProCurve Networking IP Telephony
Solution Implementation Guide on Mitel OnLine.
Refer to http://www.hp.com/rnd/solutions/convergence.htm for examples of how to set up HP
switches in a VoIP environment.
WAN layer 3 priority
A number of different WAN technologies provide data routing with different priorities and Service
Level Agreements (SLA). Most of these deal with the WAN technology, but most rely on
information being presented in the Layer 3 Type-of-Service (TOS) field.
The Type-of-Service field has undergone some name and function changes. This field is now
also known as Differentiated Services Code Point (DSCP) or DiffServ. The DiffServ uses the
precedence and some of the TOS bits (TOS instead of Type of Service field) to provide 64
different service levels. See Figure 30 on page 209 for the location of the Type-of-Service field.
Voice will typically be sent in the Expedited Forwarding (EF) queue which is represented by a
DSCP value of 46.
The DSCP value is programmed using DHCP server option (see “DHCP Option
Reclassification” on page 241). This is picked up by the IP phones. The default Mitel values for
DSCP was previously fixed at 44 to allow backward compatibility with older TOS based routers.
However, today, 46 is the expected value to be used. A DSCP value of 44 will still be directed
to a high priority queue, but 46 is handled in a more “Expedited” manner. It is recommended
that to provide for product at different levels routers (default gateways) map DSCP44 to
Note: Using VLAN 0 with HP is not recommended. However, it is possible to extend
VLAN numbering up to a maximum of 4093.