Ieee 802.1D And 802.1Q - Avaya 4600 Series Administrator's Manual

IEEE 802.1D and 802.1Q

IEEE's 802.1Q standard defines a tag that can be added to voice and data packets. Most of the
information associated with this tag deals with Virtual LAN (VLAN) management, but 3 bits are
reserved for identifying packet priority. These 3 bits allow any one of 8 priorities to be assigned
to a specific packet. As defined in the standard, the 8 priorities are, from highest to lowest:
7: Network management traffic
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6: Voice traffic with less than 10ms latency
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5: Voice traffic with less than 100ms latency
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4: "Controlled-load" traffic for mission-critical data applications
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3: Traffic meriting "extra-effort" by the network for prompt delivery, for example, executives'
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e-mail
2: Reserved for future use
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0: Traffic meriting the network's "best-effort" for prompt delivery. This is the default priority.
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1: Background traffic such as bulk data transfers and backups
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Note:
Priority 0 is a higher priority than Priority 1.
Note:
To support IEEE 802.1D/Q, the 4600 Series IP Telephones can be administered either of
two ways:
from the network by appropriate administration of the DHCP or TFTP/HTTP servers, as
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covered in
at the telephone itself using dialpad input, as covered under local administrative
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procedures in the 4600 Series IP Telephone Installation Guide.
Eight IEEE 802.1D/Q QoS parameters in the telephones can be administered, as follows. The
first five parameters are for standard 802.1Q tagging and apply to any 4600 Series IP
Telephone. The last three parameters apply to all 4600 Series IP Telephones with a secondary
Ethernet interface.
L2Q: 802.1Q framing parameter (1=On, 2=Off, or 0=AUTO). The default is 0, but the
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preferred setting is 1 (ON). You can manually set the L2Q value of a specific 4600 IP
Telephone to any value, for example, AUTO, ON, or OFF. However, any subsequent value
administered via DHCP or TFTP/HTTP settings file will override the manual value. To use
the QoS Local Administrative Option to set L2Q manually see the 4600 Series IP
Telephone Installation Guide.
L2QVLAN: the VLAN ID on which the telephone should operate. For example, what VLAN
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ID to use for DHCP Discovery, etc. (up to 4 digits, from 0 to 4094, default is 0).
VLANTEST: the number of seconds to wait for a DHCPOFFER when using a non--zero
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VLAN ID (up to 3 digits, from 0 to 999, default is 60).
4600 Series IP Telephone Scripts and Application Files on page 74, or
Issue 5 November 2006
QoS
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