Chapter 16 CE-100T-8 Ethernet Operation
CE-100T-8 Ethernet Features
Table 16-2 CoS Priority Queue Mappings
CoS Setting in CTC | CoS Values Sent to Priority Queue |
| |
7 (default) | none |
| |
6 | 7 |
| |
5 | 6, 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 |
| |
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.
Cisco ONS 15310-CL Ethernet Card Software Feature and Configuration Guide, R5.0
