Detections
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1.45 CISC-RT-000640

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Information

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

GROUP ID: V-221118
RULE ID: SV-221118r999772

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.

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

Solution

Configure the switch to have each VRF instance defined with the correct RT.

SW1(config)# vrf context CUST1
SW1(config-vrf)# address-family ipv4 unicast
SW1(config-vrf-af-ipv4)# route-target import 13:13
SW1(config-vrf-af-ipv4)# route-target export 13:13
SW1(config-vrf-af-ipv4)# end

See Also

https://workbench.cisecurity.org/benchmarks/22581

Item Details

References: CAT|I, CCI|CCI-004931, CSCv7|13.3, Rule-ID|SV-221118r999772_rule, STIG-ID|CISC-RT-000640, Vuln-ID|V-221118

Plugin: Cisco

Control ID: 396ea75ad533b84000e49c3475efe0971ee2d3c0aaa22f3c2be9e368aa7adacb