CISC-RT-000760 - The Cisco PE switch must be configured to enforce a Quality-of-Service (QoS) policy to provide preferred treatment for mission-critical applications.

Information

Different applications have unique requirements and toleration levels for delay, jitter, bandwidth, packet loss, and availability. To manage the multitude of applications and services, a network requires a QoS framework to differentiate traffic and provide a method to manage network congestion. The Differentiated Services Model (DiffServ) is based on per-hop behavior by categorizing traffic into different classes and enabling each node to enforce a forwarding treatment to each packet as dictated by a policy.

Packet markings such as IP Precedence and its successor, Differentiated Services Code Points (DSCP), were defined along with specific per-hop behaviors for key traffic types to enable a scalable QoS solution. DiffServ QoS categorizes network traffic, prioritizes it according to its relative importance, and provides priority treatment based on the classification. It is imperative that end-to-end QoS is implemented within the IP core network to provide preferred treatment for mission-critical applications.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Configure to enforce a QoS policy to provide preferred treatment for mission-critical applications.

Step 1: Configure class-maps to match on DSCP values as shown in the configuration example below:

SW1(config)#class-map match-all PREFERRED_DATA
SW1(config-cmap)#match ip dscp af33
SW1(config-cmap)#class-map match-all CONTROL_PLANE
SW1(config-cmap)#match ip dscp cs6
SW1(config-cmap)#class-map match-all VIDEO
SW1(config-cmap)#match ip dscp af41
SW1(config-cmap)#class-map match-all VOICE
SW1(config-cmap)#match ip dscp ef
SW1(config-cmap)#class-map match-all C2_VOICE
SW1(config-cmap)#match ip dscp 47
SW1(config-cmap)#exit

Step 2: Configure a policy map to be applied to the core-layer-facing interface that reserves the bandwidth for each traffic type as shown in the example below:

SW1(config)#policy-map QOS_POLICY
SW1(config-pmap)#class CONTROL_PLANE
SW1(config-pmap-c)#priority percent 10
SW1(config-pmap-c)#class C2_VOICE
SW1(config-pmap-c)#priority percent 10
SW1(config-pmap-c)#class VOICE
SW1(config-pmap-c)#priority percent 15
SW1(config-pmap-c)#class VIDEO
SW1(config-pmap-c)#bandwidth percent 25
SW1(config-pmap-c)#class PREFERRED_DATA
SW1(config-pmap-c)#bandwidth percent 25
SW1(config-pmap-c)#class class-default
SW1(config-pmap-c)#bandwidth percent 15
SW1(config-pmap-c)#exit
SW1(config-pmap)#exit

Step 3: Apply the output service policy to all interfaces as shown in the configuration example below:

SW1(config)#int g1/1
SW1(config-if)#service-policy output QOS_POLICY
SW1(config-if)#exit
SW1(config)#int g1/2
SW1(config-if)#service-policy output QOS_POLICY
SW1(config-if)#end

Item Details

Audit Name: DISA STIG Cisco IOS Switch RTR v3r1

Category: SYSTEM AND COMMUNICATIONS PROTECTION

Plugin: Cisco

Control ID: 80ce19dd87ccb8c32750717454f75c48e9b91e2ade751c45f5f017872f4272a1

Detections

Analytics

CISC-RT-000760 - The Cisco PE switch must be configured to enforce a Quality-of-Service (QoS) policy to provide preferred treatment for mission-critical applications.

Information

Solution

See Also

Item Details