Traffic Prioritization - GE JungleMUX SONET Technical Practice

Traffic Prioritization

Each "add" frame (a frame ingressing a drop port) is assigned a mapping priority
(0 to 7, where 7 is the highest and 0 is the lowest priority). The mapping priority
is carried in the secure tag attached to each frame for transmission between
ETHER-1000 units. This tag is removed at the far-end unit's drop port.
The mapping priority may be set based on the frame's source priority (802.1p/Q
tag, IP TOS field, or, if neither is present, user-defined default priority).
Optionally, the user can force the mapping priority of all frames ingressing the
given access port to a specific priority.
Each paddleboard port is capable of detecting ingressing "mission critical" frames
based on the frame‟s embedded EtherType code (e.g. 88b8 for GOOSE
messages). All frames whose EtherType code is matching the port‟s EtherType
setting will be treated as "super-priority frames" and they will be switched through
the highest priority queues in both "LAN" and "WAN" switches.
feature guarantees that the selected mission critical traffic is transported with the
highest priority possible.
Note: In the case of a "nested 802.1Q frame" (QinQ), the relevant 802.1p/Q
priority field is the one carried in the last nesting level (i.e. in the "outer" 802.1Q
tag, which is the one received first in the sequence of up to 28 nested 802.1Q
tags).
The "LAN" switch (residing on the paddleboard) has 4 priority queues. The
ingressing frames with source priorities 0/1, 2/3 and 4/5 are mapped into the
three lower priority queues, respectively, while the top-priority queue is used for
the segregated EtherType traffic and frames with source priorities 6 and 7.
The ETHER-1000 unit (the "WAN" switch) has 16 priority queues (8 for "add"
traffic and 8 for "pass-through" traffic) for each TDM pipe on either Line port. The
unit also has 8 priority queues for the "drop" traffic passed to the GMII port (the
port facing paddleboard).
reserved for "EtherType traffic"
all other traffic.
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When ETHER-100 units are used in the same ETHER system, special caution shall be
exercised as these units do not support this feature. See Port Details tab description in Section 5
for more details.
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The Top port (i.e. the Ethernet port residing on the top of ETHER-1000 unit) is unused and
therefore not mentioned here.
This is in addition to ETHER-1000 "system maintenance traffic", which is very minimal.
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Copyright  GE Multilin Inc. 2010-2012
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19 The highest priority queue (within each set of 8) is
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, while the 7 lower priority queues are used for
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Issue 1.2
April 2012
Page 35
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