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The Cisco PE router must be configured to have each Virtual Routing and Forwarding (VRF) instance with the appropriate Route Target (RT).

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-216612CISC-RT-000640SV-216612r991842_ruleCCI-004931high
Description
The primary security model for an MPLS L3VPN as well as a VRF-lite infrastructure is traffic separation. Each interface can only be associated to one VRF, which is the fundamental framework for traffic separation. Forwarding decisions are made based on the routing table belonging to the VRF. Control of what routes are imported into or exported from a VRF is based on the RT. It is critical that traffic does not leak from one COI tenant or L3VPN to another; hence, it is imperative that the correct RT is configured for each VRF.
STIGDate
Cisco IOS Router RTR Security Technical Implementation Guide2025-08-19

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

BCD-10.4Alternate Communications Channels
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (5) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

SC-47Alternate Communications Paths
1.00
SC-5(2)Capacity, Bandwidth, and Redundancy
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
CCI1 mapping
CCI-004931
1.00

Details

Check Text (C-216612r991842_chk)

Review the design plan for MPLS/L3VPN to determine what RTs have been assigned for each VRF. Review the router configuration and verify that the correct RT is configured for each VRF. In the example below, route target 13:13 has been configured for customer 1. ip vrf CUST1 rd 13:13 route-target export 13:13 route-target import 13:13 If there are VRFs configured with the wrong RT, this is a finding.

Fix Text (F-17843r508000_fix)

Configure the router to have each VRF instance defined with the correct RT. R5(config)#ip vrf CUST1 R5(config-vrf)#route-target import 13:13 R5(config-vrf)#route-target export 13:13 R5(config-vrf)#end