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A Quality of Service (QoS) policy must be implemented to provide preferred treatment for Command and Control (C2) real-time services and control plane traffic.


Finding ID Version Rule ID IA Controls Severity
V-66363 NET2005 SV-80853r1_rule Low
Different applications have unique requirements and toleration levels for delay, jitter, packet loss, and availability. To manage the multitude of applications and services, a network requires a Quality of Service (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 service 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 to guarantee the required bandwidth for control plane traffic and C2 real-time services during periods of congestion within the JIE WAN IP network.
Network Infrastructure Policy Security Technical Implementation Guide 2019-03-12


Check Text ( C-67009r1_chk )
Review each router and verify that a QoS policy has been configured to provide preferred treatment for control plane traffic and C2 real-time services.

Step 1: Verify that the class-maps are configured to match on DSCP values that have been set at the edges as shown in the configuration example below:

class-map match-all CONTROL_PLANE
match ip dscp 48
class-map match-all C2_VOICE
match ip dscp 47
class-map match-all VOICE
match ip dscp ef
class-map match-all VIDEO
match ip dscp af4
class-map match-all PREFERRED_DATA
match ip dscp af3

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

policy-map QOS_POLICY
priority percent 10
class C2_VOICE
priority percent 10
class VOICE
priority percent 15
class VIDEO
bandwidth percent 25
bandwidth percent 25
class class-default
bandwidth percent 15

Step 3: Verify that an output service policy is bound to the core-layer-facing interface as shown in the configuration example below:

interface GigabitEthernet1/1
ip address
service-policy output QOS_POLICY

If a QoS policy has not been implemented within the JIE WAN infrastructure to provide assured services for control plane traffic and C2 real-time services, this is a finding.
Fix Text (F-72439r1_fix)
Configure a QoS policy on each router to provide assured services for control plane traffic and C2 real-time services.