The PE router 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.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-256052 | ARST-RT-000730 | SV-256052r882498_rule | High |
| Description |
|---|
| 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. |
| STIG | Date |
|---|---|
| Arista MLS EOS 4.2x Router Security Technical Implementation Guide | 2023-01-17 |
Details
| Check Text ( C-59728r882496_chk ) |
|---|
| Review the design plan for deploying L3VPN and VRF-lite. Review all CE-facing interfaces and verify the proper VRF is defined. To verify the interfaces toward CE facing with proper VRF defined, execute the command "sh run int ethernet YY". vrf instance PROD vrf instance DEVP ip routing vrf PROD ip routing vrf DEVP interface Ethernet3 no routerport vrf PROD ip address 10.1.99.11/24 interface Ethernet4 no routerport vrf DEVP ip address 10.11.5.11/24 If any VRFs are not bound to the appropriate physical or logical interface, this is a finding. |
| Fix Text (F-59671r882497_fix) |
|---|
| Configure the Arista PE router to have each VRF bound to the appropriate physical or logical interfaces to maintain traffic separation between all MPLS L3VPNs. Configure the VRF on the CE facing interfaces. PE11(config)#vrf instance PROD PE11(config)#vrf instance DEVP ! PE11(config)#ip routing vrf PROD PE11(config)#ip routing vrf DEVP ! PE11(config)#interface Ethernet3 PE11(config-if-Et3)#no routerport PE11(config-if-Et3)#vrf PROD PE11(config-if-Et3)#ip address 10.1.99.11/24 ! PE11(config)#interface Ethernet4 PE11(config-if-Et3)#no routerport PE11(config-if-Et3)#vrf DEVP PE11(config-if-Et3)#ip address 10.11.5.11/24 |