Check: CISC-RT-000630
Cisco NX OS Switch RTR STIG:
CISC-RT-000630
(in versions v2 r3 through v1 r0.1)
Title
The Cisco PE switch must be configured to have each Virtual Routing and Forwarding (VRF) instance bound to the appropriate physical or logical interfaces to maintain traffic separation between all MPLS L3VPNs. (Cat I impact)
Discussion
The primary security model for an MPLS L3VPN infrastructure is traffic separation. The service provider must guarantee the customer that traffic from one VPN does not leak into another VPN or into the core, and that core traffic must not leak into any VPN. Hence, it is imperative that each CE-facing interface can only be associated to one VRF—that alone is the fundamental framework for traffic separation.
Check Content
Step 1: Review the design plan for deploying MPLS/L3VPN. Step 2: Review all CE-facing interfaces and verify that the proper VRF is defined via the ip vrf forwarding command. In the example below, customer 1 is bound to interface Ethernet2/1, while customer 2 is bound to Ethernet2/2. interface Ethernet2/1 no switchport vrf member CUST1 ip address x.2.22.3/24 interface Ethernet2/2 no switchport vrf member CUST2 ip address x.2.8.4/24 If any VRFs are not bound to the appropriate physical or logical interface, this is a finding.
Fix Text
Configure the PE switch to have each VRF bound to the appropriate physical or logical interfaces to maintain traffic separation between all MPLS L3VPNs.
Additional Identifiers
Rule ID: SV-221117r622190_rule
Vulnerability ID: V-221117
Group Title: SRG-NET-000512-RTR-000005
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |