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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254065	JUEX-RT-000930	SV-254065r997538_rule		High

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.

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.

STIG	Date
Juniper EX Series Switches Router Security Technical Implementation Guide	2024-06-10

Details

Check Text ( C-57517r844226_chk )
Verify that the correct RT is configured for each VRF. Review the design plan for MPLS/L3VPN and VRF-lite to determine what RTs have been assigned for each VRF. Review the route-distinguisher and vrf-target statements under each configured VRF and verify that the correct RTs have been defined for each VRF. Assuming the assigned RT for "customer 1" is "cust1:33:33", verify vrf-target matches. [edit routing-instances] { description "To customer 1"; instance-type vrf; interface .; route-distinguisher 33:33; << Must match the design plan for "customer 1". vrf-target cust1:33:33; << Must match the design plan for "customer 1". vrf-table-label; protocols { ospf { area { interface .; } } } } Note: In L3 VPN, the CE router forms an adjacency with the PE router (OSPF in the example). If there are VRFs configured with the wrong RT, this is a finding.

Check Text ( C-57517r844226_chk )

Verify that the correct RT is configured for each VRF.

Review the design plan for MPLS/L3VPN and VRF-lite to determine what RTs have been assigned for each VRF.

Review the route-distinguisher and vrf-target statements under each configured VRF and verify that the correct RTs have been defined for each VRF. Assuming the assigned RT for "customer 1" is "cust1:33:33", verify vrf-target matches.

[edit routing-instances]
{
description "To customer 1";
instance-type vrf;
interface .;
route-distinguisher 33:33; << Must match the design plan for "customer 1".
vrf-target cust1:33:33; << Must match the design plan for "customer 1".
vrf-table-label;
protocols {
ospf {
area {
interface .;
}
}
}
}

Note: In L3 VPN, the CE router forms an adjacency with the PE router (OSPF in the example).

If there are VRFs configured with the wrong RT, this is a finding.

Fix Text (F-57468r844227_fix)
Configure all J-PE routers to have the correct VRF defined with the appropriate RT. set routing-instances description <"appropriate description"> set routing-instances instance-type vrf set routing-instances interface . set routing-instances route-distinguisher 33:33 << Must match the design plan for "customer 1". set routing-instances vrf-target cust1:33:33 << Must match the design plan for "customer 1". set routing-instances vrf-table-label set routing-instances protocols ospf area interface .

Fix Text (F-57468r844227_fix)

Configure all J-PE routers to have the correct VRF defined with the appropriate RT.

set routing-instances description <"appropriate description">
set routing-instances instance-type vrf
set routing-instances interface .
set routing-instances route-distinguisher 33:33 << Must match the design plan for "customer 1".
set routing-instances vrf-target cust1:33:33 << Must match the design plan for "customer 1".
set routing-instances vrf-table-label
set routing-instances protocols ospf area interface .