Dell PowerConnect 7048P User Manual - Page 1116
What Are Trusted and Untrusted Port Modes?, How Is Traffic Shaping Used on Egress Traffic?
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Each ingress port on the switch has a default priority value (set by configuring VLAN Port Priority in the Switching sub-menu) that determines the egress queue its traffic gets forwarded to. Packets that arrive without a priority designation, or packets from ports you've identified as "untrusted," get forwarded according to this default. What Are Trusted and Untrusted Port Modes? Ports can be configured in "trusted" mode or "untrusted" mode with respect to ingress traffic. Ports in Trusted Mode When a port is configured in trusted mode, the system accepts at face value a priority designation encoded within packets arriving on the port. You can configure ports to trust priority designations based on one of the following fields in the packet header: • 802.1 Priority: values 0-7 • IP DSCP: values 0-63 A mapping table associates the designated field values in the incoming packet headers with a traffic class priority (actually a CoS traffic queue). Ports in Untrusted Mode If you configure an ingress port in untrusted mode, the system ignores any priority designations encoded in incoming packets, and instead sends the packets to a traffic queue based on the ingress port's default priority. How Is Traffic Shaping Used on Egress Traffic? For unit/slot/port interfaces, you can specify a traffic shaping rate for the port (in Kbps) for egress traffic. The traffic shaping rate specifies an upper limit of the transmission bandwidth used. 1116 Configuring Class-of-Service
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1,209
-
1,210
-
1,211
-
1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234