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Cisco IOS Router RTR Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000018-RTR-000004

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  • The Cisco BGP router must be configured to reject inbound route advertisements from a customer edge (CE) router for prefixes that are not allocated to that customer.

    As a best practice, a service provider should only accept customer prefixes that have been assigned to that customer and any peering autonomous systems. A multi-homed customer with BGP speaking rou...
    Rule Medium Severity
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  • SRG-NET-000018-RTR-000005

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  • SRG-NET-000205-RTR-000006

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  • The Cisco BGP router must be configured to reject outbound route advertisements for any prefixes belonging to the IP core.

    Outbound route advertisements belonging to the core can result in traffic either looping or being black holed, or at a minimum, using a non-optimized path.
    Rule Medium Severity
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  • SRG-NET-000018-RTR-000006

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  • SRG-NET-000018-RTR-000010

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  • SRG-NET-000362-RTR-000117

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  • SRG-NET-000362-RTR-000118

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  • The Cisco BGP router must be configured to limit the prefix size on any inbound route advertisement to /24 or the least significant prefixes issued to the customer.

    The effects of prefix de-aggregation can degrade router performance due to the size of routing tables and also result in black-holing legitimate traffic. Initiated by an attacker or a misconfigured...
    Rule Low Severity
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  • SRG-NET-000512-RTR-000001

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  • SRG-NET-000512-RTR-000002

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  • The Cisco MPLS router must be configured to use its loopback address as the source address for LDP peering sessions.

    Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of backbone routers. It is easier to construct appropriate ingress filter...
    Rule Low Severity
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  • SRG-NET-000512-RTR-000003

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  • SRG-NET-000193-RTR-000001

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  • The MPLS router with RSVP-TE enabled must be configured with message pacing to adjust maximum burst and maximum number of RSVP messages to an output queue based on the link speed and input queue size of adjacent core routers.

    RSVP-TE can be used to perform constraint-based routing when building LSP tunnels within the network core that will support QoS and traffic engineering requirements. RSVP-TE is also used to enable ...
    Rule Low Severity
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  • SRG-NET-000512-RTR-000004

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  • SRG-NET-000512-RTR-000005

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  • The Cisco 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.

    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 ...
    Rule High Severity
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  • SRG-NET-000512-RTR-000006

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