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Cisco ONS 15310-CL Ethernet Card Software Feature and Configuration Guide, R5.0
June 2005
Chapter 16 CE-100T-8 Ethernet Operation
CE-100T-8 Ethernet Features
Ethernet frames without VLAN tagging use ToS-based priority queueing if both ToS and CoS priority
queueing is active on the card. The CE-100T-8 card’s ToS setting must be lower than 255 (default) and
the CoS setting lower than 7 (default) for CoS and ToS priority queueing to be active. A ToS setting of
255 (default) disables ToS priority queueing, so in this case the CoS setting would be used.
Ethernet frames with VLAN tagging use CoS-based priority queueing if both ToS and CoS are active on
the card. The ToS setting is ignored. CoS based priority queueing is disabled if the CoS setting is the 7
(default), so in this case the ToS setting would be used.
If the CE-100T-8 card’s ToS setting is 255 (default) and the CoS setting is 7 (default), priority queueing
is not active on the card, and data gets sent to the default normal traffic queue. Also if data is not tagged
with a ToS value or a CoS value before it enters the CE-100T-8 card, it gets sent to the default normal
traffic queue.
Note Priority queuing has no effect when flow control is enabled (default) on the CE-100T-8. Under flow
control a 6 kilobyte single-priority first in first out (FIFO) buffer fills, then a PAUSE frame is sent. This
results in the packet ordering priority becoming the responsibility of the external device, which is
buffering as a result of receiving the PAUSE flow-control frames.
Note Priority queuing has no effect when the CE-100T-8 is provisioned with STS-3C circuits. The STS-3c
circuit has more data capacity than Fast Ethernet, so CE-100T-8 buffering is not needed. Priority queuing
only takes effect when buffering occurs.
RMON and SNMP Support
The CE-100T-8 card features remote monitoring (RMON) that allows network operators to monitor the
health of the network with a network management system (NMS). The CE-100T-8 uses the ONG RMON.
The ONG RMON contains the statistics, history, alarms, and events MIB groups from the standard
RMON MIB, as well as Simple Network Management Protocol (SNMP). A user can access RMON
threshold provisioning through TL1 or CTC. For RMON threshold provisioning with CTC, see the
Cisco ONS 15310-CL Procedure Guide and the Cisco ONS 15310-CL Troubleshooting Guide. For TL1
information, see the Cisco ONS SONET TL1 Command Guide.
Table 16-2 CoS Priority Queue Mappings
CoS Setting in CTC CoS Values Sent to Priority Queue
7 (default) none
67
56, 7
4 5, 6, 7
3 4, 5, 6, 7
2 3, 4, 5, 6, 7
1 2, 3, 4, 5, 6, 7
0 1, 2, 3, 4, 5, 6, 7