Cisco 15327 - Manual (Page 414)

24-6
Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 24 CE-100T-8 Ethernet Operation
RMON and SNMP Support
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 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. If data is not tagged with
a ToS value or a CoS value before it enters the CE-100T-8 card, it also 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. When flow
control is enabled, 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 during buffering.
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. A user can access RMON threshold provisioning through TL1 or CTC. For RMON
threshold provisioning with CTC, see the Cisco ONS 15454 Procedure Guide (NTP-A279) and the
Cisco ONS 15454 Troubleshooting Guide, or the Cisco ONS 15454 SDH Procedure Guide and the
Cisco ONS 15454 SDH Troubleshooting Guide.
Statistics and Counters
The CE-100T-8 has a full range of Ethernet and POS statistics information under Performance >
Ether Ports or Performance > POS Ports.
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
Table 24-2 CoS Priority Queue Mappings (continued)
CoS Setting in CTC CoS Values Sent to Priority Queue