Appendix C Switch Port Functionality

802.1P CoS

Disabling VTP (VTP Transparent Mode) Example

The following example shows how to configure the switch as VTP transparent:

Router# vlan database

Router(vlan)# vtp transparent

Setting device to VTP TRANSPARENT mode.

Router(vlan)# exit

APPLY completed.

Exiting....

Router#

VTP Version 2 Example

The following example shows how to enable VTP version 2:

Router# vlan database

Router(vlan)# vtp v2-mode

V2 mode enabled.

Router(vlan)# exit

APPLY completed.

Exiting....

Router#

802.1P CoS

The IEEE 802.1P specification defines eight levels of priority (0 thru 7), with priority 7 being the highest priority. This information is carried in the 3-bit priority field of the VLAN tag header.

The FESMIC supports up to four class of service (CoS) queues per port. For the tagged packets, the incoming packet priority can be mapped into one of the four queues, based on the priority field in the tag header or from the result of filtering mechanism. For untagged packets, the CoS priority is derived either from a programmable field within the ARL (MAC address table) or from the result of filtering mechanism.

After the packets are mapped into a CoS queue, they are forwarded or conditioned using these scheduling algorithms:

Strict priority-based scheduling—Any packets residing in the higher priority queues are transmitted first. Only when these queues are empty will packets of lower priority be transmitted. The disadvantage of this scheme is the potential starvation of packets in lower priority queues.

Weighted round-robin scheduling—This scheme alleviates the starvation of packets in lower priority queues by providing a certain minimum bandwidth to all queues for transmission. This bandwidth is programmable as the maximum number of packets of each CoS.

The FESMIC 10/100 Fast Ethernet interfaces default to use the strict priority-based scheduling. After system boots, you can enable weighted round-robin scheduling.

Mapping 802.1P priority to IP precedence bits is not supported.

Cisco 3200 Series Router Hardware Reference

 

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Cisco Systems 3200 manual 802.1P CoS, Disabling VTP VTP Transparent Mode Example, VTP Version 2 Example

3200 specifications

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