Nortel 1110 User Guide
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Appendix B 802.1Q VLAN description
An IP Phone can receive Broadcast frames from a PC data VLAN. Any
data network broadcast storm packets from the network are seen by the IP
Phone. Significant broadcast storms occurring on the DATA VLAN can
impact IP Phone performance. See
data network broadcast storm packets from the network are seen by the IP
Phone. Significant broadcast storms occurring on the DATA VLAN can
impact IP Phone performance. See
for configuration information to filter network activity from impacting IP
Phone performance.
Enhanced 802.1P and 802.1Q support on the IP Phones improves voice
quality by taking advantage of the VLAN filtering available on the three-port
switch on the BCM 1100/1101/1103.
quality by taking advantage of the VLAN filtering available on the three-port
switch on the BCM 1100/1101/1103.
The following functions are available on the three-port switch
•
hardware VLAN filter
•
two TX (out) queues on each port —High Priority Queue (HPQ) and
Low Priority Queue (LPQ)
Low Priority Queue (LPQ)
Therefore, traffic other than Voice VLAN can be filtered by enabling the
VLAN filtering feature and taking advantage of the hardware VLAN filter.
Voice traffic is always queued to the HPQ thereby that provide a higher
quality of service.
VLAN filtering feature and taking advantage of the hardware VLAN filter.
Voice traffic is always queued to the HPQ thereby that provide a higher
quality of service.
VLAN IDs
The VOICE and DATA VLAN ID fields can be specified on a per interface
basis. There is only one network interface on the IP Phone; however, the IP
Phone has two internal IDs, one for voice and one for data traffic. The IP
Phone firmware can detect and route the voice and data traffic.
basis. There is only one network interface on the IP Phone; however, the IP
Phone has two internal IDs, one for voice and one for data traffic. The IP
Phone firmware can detect and route the voice and data traffic.
The VLAN ID fields are global settings. That is, all voice packets transmitted
by the IP Phone have the same VOICE VLAN ID. If DATA VLAN is enabled,
the IP Phone adds the DATA VLAN ID to untagged traffic. However, if the
traffic arriving on the PC port is already tagged, the frame passes through
unchanged.
by the IP Phone have the same VOICE VLAN ID. If DATA VLAN is enabled,
the IP Phone adds the DATA VLAN ID to untagged traffic. However, if the
traffic arriving on the PC port is already tagged, the frame passes through
unchanged.
Each VLAN ID is specified as follows
•
The default VLAN ID is 000 (hex).
•
The VOICE and DATA VLAN IDs can be specified in the manual
configuration user interface.
configuration user interface.
•
Or, in the case of the VOICE VLAN ID, the VOICE VLAN ID can also
be configured by the DHCP parameter when using the Automatic VLAN
discovery using DHCP approach.
be configured by the DHCP parameter when using the Automatic VLAN
discovery using DHCP approach.
Automatic VOICE VLAN ID configuration
As part of the 802.1Q feature, there is an option to automatically discover
the VOICE VLAN ID using DHCP. This process reduces the configuration
steps since entering data manually (the VOICE VLAN ID) is not required.
the VOICE VLAN ID using DHCP. This process reduces the configuration
steps since entering data manually (the VOICE VLAN ID) is not required.
Nortel Communication Server 1000
IP Phones Fundamentals
NN43001-368
02.01
Standard
Release 5.0
7 December 2007
Copyright © 2003–2007, Nortel Networks
.