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Configure Priority Mapping Example

Network Requirements

  • There are two servers in the network, that is, Video server and Data server.
  • The DSCP value in the video traffic packet is 34 and the DSCP value in the data traffic packet is 38.
  • Configure the priority mapping function, realizing that the 802.1p priority of the video traffic packet is 5 and the 802.1p priority of the data traffic packet is 1.

Network Topology

Networking of configuring the priority mapping

Figure 1-3 Networking of configuring the priority mapping

Configuration Steps

Step 1: Configure the link type of the VLAN and port on Device.

#Create VLAN2.

Device#configure terminal
Device(config)#vlan 2
Device(config-vlan2)#exit

#Configure the link type of port gigabitethernet0/1 as Access and permit the services of VLAN2 to pass.

Device(config)#interface gigabitethernet 0/1
Device(config-if-gigabitethernet0/1)#switchport mode access
Device(config-if-gigabitethernet0/1)#switchport access vlan 2

#Configure the link type of port gigabitethernet0/2 as Trunk and permit the services of VLAN2 to pass.

Device(config-if-gigabitethernet0/1)#interface gigabitethernet 0/2
Device(config-if-gigabitethernet0/2)#switchport mode trunk
Device(config-if-gigabitethernet0/2)#switchport trunk allowed vlan add 2
Device(config-if-gigabitethernet0/2)#exit

Step 2: Configure the priority mapping function.

#Configure the priority mapping function globally, map the packet with DSCP value 34 to queue 2 and map the packet with DSCP value 38 to queue 3.

Device(config)#qos map-table ingress a
Device(config-maptable-ingress)#dscp-lp 34 to 2
Device(config-if-gigabitethernet0/1)# dscp-lp 38 to 3

#Globally configure the priority mapping function, map the 802.1p priority of the packet in queue 2 to 5, and map the 802.1p priority of the packet in queue 3 to 1.

Device(config)#qos map-table egress b
Device(config-maptable-egress)#lp-dot1p 2 to 5
Device(config- maptable-egress)# lp-dot1p 3 to 1

# On the port, bind the profile and configure trust.

Device(config)#interface gigabitethernet 0/1
Device(config-if-gigabitethernet0/1)# map-table a ingress
Device(config-if-gigabitethernet0/1)#qos map-table trust dscp ingress
Device(config)#interface gigabitethernet 0/2
Device(config-if-gigabitethernet0/2)# map-table b egress
Device(config-if-gigabitethernet0/2)#qos map-table trust dot1p egress

Step 3: Check the result.

#After the video traffic and data traffic are processed by Device, the 802.1p priority of the video traffic packet sent out from port gigabitethernet0/2 is 5 and the 802.1p priority of the data traffic packet is 1.