Page 494 of 910 Configuration of IP Telephony nodes using OTM 2.2
553-3001-365 Standard 4.00 August 2005
2802.1Q enables virtual LANs (VLANs) to be defined within a single LAN.
This improves bandwidth management and limits the impact of broadcast
and multicast messages.
Configure the 802.1Q settings as follows:
a. Enable 802.1Q support: Select the check box to enable 802.1Q
support. By default, 802.1Q support is disabled.
b. Priority Bits value (802.1p): The priority field is a 3-bit value, with a
default value of 6. The range is 0 – 7. A value of 6 is recommended
by Nortel. The p bits within the 802.1Q standard enables packet
prioritization at Layer 2, improving network throughput for
IP Telephony data.
Note: These values are applied to all Voice Gateway Media Cards in the
node.
3Under DiffServ Codepoint, modify the DSCP Control and Voice values
only as directed by the IP network administrator.
The recommended configuration values are:
a. Control packets: A value of 40 – Class Selector 5 (CS5). This sets
the priority of the signaling messaging.
b. Voice packets: A value of 46 Control DSCP – Expedited Forwarding
(EF).
The DSCP determines the priorities of the management and voice
packets in the IP Line network. The range for both management and
voice packet DSCP is 0 – 63 inclusive.
The DSCP value can be configured, if required, to obtain better QoS
over the IP data network (LAN/WAN).
The value entered depends on the policy in the customer’s data
network.
Note: Do not change DSCP from the default values unless instructed.
4Click Apply and then click OK.
Note: As described on the QoS tab, NAT and QoS parameters are no
longer configured here. Therefore, those areas are grayed out.
End of Procedure