Network design
296 Avaya Application Solutions IP Telephony Deployment Guide
An IP Telephone and an attached PC on the same VLAN
Three variations exist for attaching a personal computer to the telephone. The first two involve
having both the telephone and the computer on the same VLAN, which is the port VLAN or the
native VLAN. Refer to the IP Telephony Implementation Guide for a primer on VLANs. In the
first scenario, traffic from both the telephone and the PC have no CoS tagging. In this case, no
special configurations are necessary. Just attach the telephone to an access port (one with only
the port VLAN or the native VLAN configured), and attach the computer to the telephone.
The second scenario is similar to the first, except that traffic from the telephone is tagged with
Layer 2/Layer 3 priority while remaining on the port VLAN or the native VLAN. The telephone
must be configured to tag its Ethernet frames and/or IP packets with the desired priority. This is
normally set by DHCP or TFTP by specifying the following parameters:
●
802.1Q. On/off for 802.1Q tagging. Turn this on if Layer 2 priority tagging is desired.
Otherwise, turn this off.
●
L2 audio. Layer 2 CoS tag for Ethernet frames that contain audio packets. Set this to a
value between 0 and 7. This value is sent to the telephone by Avaya Communication
Manager, as configured on the IP Network Region form.
●
L2 signaling. Layer 2 CoS tag for Ethernet frames that contain signaling packets. Set this
to a value between 0 and 7. This value is sent to the telephone by Avaya Communication
Manager, as configured on the IP Network Region form.
●
LAN ID. Must be set to zero (0) for this scenario. A VID of zero indicates that the Ethernet
frame belongs on the port VLAN or native VLAN. The VID has no effect when 802.1Q
tagging is disabled. Cajun switches require no special configuration for this scenario.
Cisco switches, however, behave differently for different hardware platforms and OS
versions.
Table 70: Cisco hardware characteristics
on page 289 shows Avaya laboratory
test results on a sample of hardware platforms and OS versions.
●
L3 audio. Layer 3 DSCP for audio IP packets. Set this to a value between 0 and 63. This
value is sent to the telephone by Avaya Communication Manager, as configured on the IP
Network Region form.
●
L3 signaling. Layer 3 DSCP for signaling IP packets. Set this to a value between 0 and 63.
This value is sent to the telephone by Avaya Communication Manager, as configured on
the IP Network Region form.
Remember that for the CoS tags to have any effect, the corresponding QoS configurations must
be implemented on the necessary network devices. Remember also that improperly enabling
Layer 2 and Layer 3 tagging can break processes that were working without tagging.
Quality of
Service guidelines
contains more information on CoS and QoS.
Summary of Contents for Application Solutions
Page 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Page 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Page 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Page 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Page 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Page 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...