STIGQter: STIG Summary: Cisco IOS Switch RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Apr 2021:

The Cisco PE switch must be configured to enforce a Quality-of-Service (QoS) policy in accordance with the QoS GIG Technical Profile.

DISA Rule

SV-220458r622190_rule

Vulnerability Number

V-220458

Group Title

SRG-NET-000193-RTR-000113

Rule Version

CISC-RT-000760

Severity

CAT III

CCI(s)

• CCI-001095 - The information system manages excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of denial of service attacks.

Weight

10

Fix Recommendation

Configure a QoS policy in accordance with the QoS GIG Technical Profile.

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

Check Contents

Review the switch configuration and verify that a QoS policy has been configured to provide preferred treatment for mission-critical applications in accordance with the QoS GIG Technical Profile.

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

class-map match-all C2_VOICE
match ip dscp af47
class-map match-all VOICE
match ip dscp ef
class-map match-all VIDEO
match ip dscp af41
class-map match-all CONTROL_PLANE
match ip dscp cs6
class-map match-all PREFERRED_DATA
match ip dscp af33

Step 2: Verify that the policy map reserves the bandwidth for each traffic type as shown in the example below:

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

Step 3: Verify that an output service policy is bound to all interfaces as shown in the configuration example below:

interface GigabitEthernet1/1
no switchport
ip address 10.1.15.1 255.255.255.252
service-policy output QOS_POLICY
!
interface GigabitEthernet1/2
no switchport
ip address 10.1.15.4 255.255.255.252
service-policy output QOS_POLICY

Note: Enclaves must mark or re-mark their traffic to be consistent with the DODIN backbone admission criteria to gain the appropriate level of service. A general DiffServ principle is to mark or trust traffic as close to the source as administratively and technically possible. However, certain traffic types might need to be re-marked before handoff to the DODIN backbone to gain admission to the correct class. If such re-marking is required, it is recommended that the re-marking be performed at the CE egress edge.

Note: The GTP QOS document (GTP-0009) can be downloaded via the following link:
https://intellipedia.intelink.gov/wiki/Portal:GIG_Technical_Guidance/GTG_GTPs/GTP_Development_List

If the switch is not configured to enforce a QoS policy in accordance with the QoS GIG Technical Profile, this is a finding.

Vulnerability Number

V-220458

Documentable

False

Rule Version

CISC-RT-000760

Severity Override Guidance

Review the switch configuration and verify that a QoS policy has been configured to provide preferred treatment for mission-critical applications in accordance with the QoS GIG Technical Profile.

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

class-map match-all C2_VOICE
match ip dscp af47
class-map match-all VOICE
match ip dscp ef
class-map match-all VIDEO
match ip dscp af41
class-map match-all CONTROL_PLANE
match ip dscp cs6
class-map match-all PREFERRED_DATA
match ip dscp af33

Step 2: Verify that the policy map reserves the bandwidth for each traffic type as shown in the example below:

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

Step 3: Verify that an output service policy is bound to all interfaces as shown in the configuration example below:

interface GigabitEthernet1/1
no switchport
ip address 10.1.15.1 255.255.255.252
service-policy output QOS_POLICY
!
interface GigabitEthernet1/2
no switchport
ip address 10.1.15.4 255.255.255.252
service-policy output QOS_POLICY

Note: Enclaves must mark or re-mark their traffic to be consistent with the DODIN backbone admission criteria to gain the appropriate level of service. A general DiffServ principle is to mark or trust traffic as close to the source as administratively and technically possible. However, certain traffic types might need to be re-marked before handoff to the DODIN backbone to gain admission to the correct class. If such re-marking is required, it is recommended that the re-marking be performed at the CE egress edge.

Note: The GTP QOS document (GTP-0009) can be downloaded via the following link:
https://intellipedia.intelink.gov/wiki/Portal:GIG_Technical_Guidance/GTG_GTPs/GTP_Development_List

If the switch is not configured to enforce a QoS policy in accordance with the QoS GIG Technical Profile, this is a finding.

Check Content Reference

M

Target Key

4065

Comments