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Weighted Fair Queuing (WFQ)
CoS classification
Table 5
Network Synchronization
Synchronous Ethernet
1/221 02-CSH 109 172/1-V1 Uen E | 2012-11-07
Network Synchronization
MINI-LINK PT 2010 Functions – Ethernet
The WFQ scheduling mechanism
offers a more flexible way to schedule
frames on an egress port and
prevents starvation of TC queues.
WFQ can be used together with the
Strict Priority scheme.
The CoS value for a frame is a
representation of the end user
application, for example, voice, best
effort data and so on, and is used to
differentiate behavior of frames in a
node.
The CoS value is set in the priority
bits in the Ethernet header, for
example, p-bits in Q-tag.
The CoS for a frame is typically
defined at the network edge. The
priority bits are set based on whether
the port is trusted/tagged or not. The
following options are supported:
• DSCP value in IPv4 or IPv6 header
(RFC 2474, RFC 2780)
• EXP bits in MPLS header
• PCP bits in C-tag or S-tag
• Default value
Transport of sync information on an
Ethernet connection according to
ITU-T G.8261, G.8262, and G.8264.
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