Switch(config-pmap)# class ipclass2 Switch(config-pmap-c)# set ip dscp 56 Switch(config-pmap-c)# police aggregate transmit1 Switch(config-pmap-c)# exit
The policed-DSCP map is a configuration that maps DSCP levels to lower levels for when you抳e chosen to 搈ark them down?
Switch# configure terminal Switch(config)# mls qos map policed-dscp 50 51 52 53 54 55 56 57 to 0 Switch(config)# end
This example says, that when you want to mark down the DSCP levels 50-57, it will mark them to 0.
Layer 2 VLANs / Spanning Tree Protocol 802.1d
VTP
VLAN Trunking Protocol was developed by Cisco Systems as a means of deploying VLAN configuration network wide. VTP allows central management of VLAN configuration, modification, and deletion. You can specify all the parameters of a VLAN on one switch and have these changes propagated to each switch within the VTP Domain. There are three modes that a switch can be in when it抯 participating in VTP, they are: Server, Transparent, and Client.
When you configure the switch to act as a Server, this is the device that you create, modify and delete you VLANs on. This device then turns around and sends out a VTP update across its trunk links. If you configure a switch to act as a Client, it will take the update received from the Server and update his own VLAN database with this new information. It will also forward these updates out its other trunk ports. Each VTP update is sent with a configuration revision number to indicate how priority of the update. The higher the number, the more recent and accurate the configuration is considered to be. Each time you modify the VLAN database the VTP Server will increase the configuration revision number by one and send this update out. When the clients receive these updates, they know that the database has changed and they need to overwrite their
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