The Cisco ACI must be configured to advertise a hop limit of at least 32 in Cisco ACI Advertisement messages for IPv6 stateless auto-configuration deployments.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-272100 | CACI-RT-000040 | SV-272100r1114112_rule | CCI-000366 | low |
| Description | ||||
| The Neighbor Discovery Protocol allows a hop limit value to be advertised by routers in a router advertisement message being used by hosts instead of the standardized default value. If a very small value was configured and advertised to hosts on the LAN segment, communications would fail due to the hop limit reaching zero before the packets sent by a host reached its destination. | ||||
| STIG | Date | |||
| Cisco ACI Router Security Technical Implementation Guide | 2025-06-18 | |||
Related Frameworks
4 paths across 3 frameworks
Related Frameworks
NIST 800-531 mapping
CM-6
1.00
- DISA · 1 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1712 mappings
3.4.1
1.00
- DISA · 1 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
3.4.2
1.00
- DISA · 1 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
CCI1 mapping
CCI-000366
1.00
- DISA · 1 · disa_xccdf · related
Details
Check Text (C-272100r1114112_chk)
Enter the "show ipv6 int" command on the leaf switch to verify the configuration was pushed out correctly to the leaf switch.
interface Ethernet 1/1
ipv6 router advertisement hop-limit 32
If a hop limit of at least 32 is not advertised in Cisco ACI advertisement messages for IPv6 stateless auto-configuration deployments, this is a finding.
Fix Text (F-76057r1114111_fix)
Configure the switch to advertise a hop limit of at least 32 in router advertisement messages as shown in the example.
Depending on the ACI configuration, it may be necessary to specify the appropriate context (like a specific VLAN or L3Out) before issuing the command.
apic1(config)# interface Ethernet 1/1
apic1(config-if)# ipv6 router advertisement hop-limit 32
Note: When configuring using a VPC interface, the ND RA prefix must be enabled for both side A and side B as both are members in the VPC configuration. Enable the ND RA prefix:
1. In the Work Pane, in the Logical Interface Profile screen, click the SVI tab.
2. Under Properties, click the check boxes to enable the ND RA Prefix for both Side A and Side B. Choose the identical ND RA Prefix Policy for Side A and Side B.