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Cisco IOS XR Router RTR Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000512-RTR-000003

    <GroupDescription></GroupDescription>
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  • The Cisco PE router must be configured to have each Virtual Routing and Forwarding (VRF) instance with the appropriate Route Target (RT).

    &lt;VulnDiscussion&gt;The primary security model for an MPLS L3VPN as well as a VRF-lite infrastructure is traffic separation. Each interface can o...
    Rule High Severity
    Show

  • The Cisco MPLS router must be configured to synchronize IGP and LDP to minimize packet loss when an IGP adjacency is established prior to LDP peers completing label exchange.

    &lt;VulnDiscussion&gt;Packet loss can occur when an IGP adjacency is established and the router begins forwarding packets using the new adjacency b...
    Rule Low Severity
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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.

    &lt;VulnDiscussion&gt;RSVP-TE can be used to perform constraint-based routing when building LSP tunnels within the network core that will support Q...
    Rule Low Severity
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  • SRG-NET-000512-RTR-000004

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  • The Cisco MPLS router must be configured to have TTL Propagation disabled.

    &lt;VulnDiscussion&gt;The head end of the label-switched path (LSP), the label edge router (LER) will decrement the IP packet's time-to-live (TTL) ...
    Rule Medium Severity
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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.

    &lt;VulnDiscussion&gt;The primary security model for an MPLS L3VPN infrastructure is traffic separation. The service provider must guarantee the cu...
    Rule High Severity
    Show

  • SRG-NET-000512-RTR-000006

    <GroupDescription></GroupDescription>
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  • SRG-NET-000512-RTR-000007

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  • The Cisco PE router must be configured to have each VRF with the appropriate Route Distinguisher (RD).

    &lt;VulnDiscussion&gt;An RD provides uniqueness to the customer address spaces within the MPLS L3VPN infrastructure. The concept of the VPN-IPv4 an...
    Rule Medium Severity
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  • SRG-NET-000343-RTR-000001

    <GroupDescription></GroupDescription>
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  • The Cisco PE router providing MPLS Layer 2 Virtual Private Network (L2VPN) services must be configured to authenticate targeted Label Distribution Protocol (LDP) sessions used to exchange virtual circuit (VC) information using a FIPS-approved message authentication code algorithm.

    &lt;VulnDiscussion&gt;LDP provides the signaling required for setting up and tearing down pseudowires (virtual circuits used to transport Layer 2 f...
    Rule Medium Severity
    Show

  • SRG-NET-000512-RTR-000008

    <GroupDescription></GroupDescription>
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  • The Cisco PE router providing MPLS Virtual Private Wire Service (VPWS) must be configured to have the appropriate pseudowire ID for each attachment circuit.

    &lt;VulnDiscussion&gt;VPWS is an L2VPN technology that provides a virtual circuit (aka pseudowire) between two PE routers to forward Layer 2 frames...
    Rule High Severity
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  • SRG-NET-000512-RTR-000009

    <GroupDescription></GroupDescription>
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  • The Cisco PE router providing Virtual Private LAN Services (VPLS) must be configured to have all attachment circuits defined to the virtual forwarding instance (VFI) with the globally unique VPN ID assigned for each customer VLAN.

    &lt;VulnDiscussion&gt;VPLS defines an architecture that delivers Ethernet multipoint services over an MPLS network. Customer Layer 2 frames are for...
    Rule High Severity
    Show

  • SRG-NET-000512-RTR-000010

    <GroupDescription></GroupDescription>
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  • The Cisco PE router must be configured to enforce the split-horizon rule for all pseudowires within a Virtual Private LAN Services (VPLS) bridge domain.

    &lt;VulnDiscussion&gt;A virtual forwarding instance (VFI) must be created on each participating PE router for each customer VLAN using VPLS for car...
    Rule Low Severity
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  • SRG-NET-000193-RTR-000002

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  • The Cisco PE router providing Virtual Private LAN Services (VPLS) must be configured to have traffic storm control thresholds on CE-facing interfaces.

    &lt;VulnDiscussion&gt;A traffic storm occurs when packets flood a VPLS bridge, creating excessive traffic and degrading network performance. Traffi...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000119

    <GroupDescription></GroupDescription>
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  • The Cisco PE router must be configured to implement Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping for each Virtual Private LAN Services (VPLS) bridge domain.

    &lt;VulnDiscussion&gt;IGMP snooping provides a way to constrain multicast traffic at Layer 2. By monitoring the IGMP membership reports sent by hos...
    Rule Low Severity
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  • SRG-NET-000192-RTR-000002

    <GroupDescription></GroupDescription>
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  • The Cisco PE router must be configured to limit the number of MAC addresses it can learn for each Virtual Private LAN Services (VPLS) bridge domain.

    &lt;VulnDiscussion&gt;VPLS defines an architecture that delivers Ethernet multipoint services over an MPLS network. Customer Layer 2 frames are for...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000007

    <GroupDescription></GroupDescription>
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  • The Cisco PE router must be configured to block any traffic that is destined to IP core infrastructure.

    &lt;VulnDiscussion&gt;IP/MPLS networks providing VPN and transit services must provide, at the least, the same level of protection against denial-o...
    Rule High Severity
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  • SRG-NET-000205-RTR-000008

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  • The Cisco PE router must be configured with Unicast Reverse Path Forwarding (uRPF) loose mode enabled on all CE-facing interfaces.

    &lt;VulnDiscussion&gt;The uRPF feature is a defense against spoofing and denial-of-service (DoS) attacks by verifying if the source address of any ...
    Rule Medium Severity
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  • SRG-NET-000193-RTR-000113

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  • The Cisco PE router must be configured to enforce a Quality-of-Service (QoS) policy to provide preferred treatment for mission-critical applications.

    &lt;VulnDiscussion&gt;Different applications have unique requirements and toleration levels for delay, jitter, bandwidth, packet loss, and availabi...
    Rule Low Severity
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  • SRG-NET-000193-RTR-000114

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  • The Cisco P router must be configured to enforce a Quality-of-Service (QoS) policy to provide preferred treatment for mission-critical applications.

    &lt;VulnDiscussion&gt;Different applications have unique requirements and toleration levels for delay, jitter, bandwidth, packet loss, and availabi...
    Rule Low Severity
    Show

  • SRG-NET-000193-RTR-000112

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  • The Cisco PE router must be configured to enforce a Quality-of-Service (QoS) policy to limit the effects of packet flooding denial-of-service (DoS) attacks.

    &lt;VulnDiscussion&gt;DoS is a condition when a resource is not available for legitimate users. Packet flooding distributed denial-of-service (DDoS...
    Rule Medium Severity
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  • SRG-NET-000019-RTR-000003

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  • The Cisco multicast router must be configured to disable Protocol Independent Multicast (PIM) on all interfaces that are not required to support multicast routing.

    &lt;VulnDiscussion&gt;If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or ...
    Rule Medium Severity
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  • SRG-NET-000019-RTR-000004

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  • The Cisco multicast router must be configured to bind a Protocol Independent Multicast (PIM) neighbor filter to interfaces that have PIM enabled.

    &lt;VulnDiscussion&gt;PIM is a routing protocol used to build multicast distribution trees for forwarding multicast traffic across the network infr...
    Rule Medium Severity
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  • SRG-NET-000019-RTR-000005

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  • The Cisco multicast edge router must be configured to establish boundaries for administratively scoped multicast traffic.

    &lt;VulnDiscussion&gt;If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or ...
    Rule Low Severity
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  • SRG-NET-000362-RTR-000120

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  • The Cisco multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Join messages received from the Designated Router (DR) for any undesirable multicast groups.

    &lt;VulnDiscussion&gt;MSDP peering between networks enables sharing of multicast source information. Enclaves with an existing multicast topology u...
    Rule Low Severity
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  • SRG-NET-000019-RTR-000013

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  • The Cisco multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Register messages received from the Designated Router (DR) for any undesirable multicast groups and sources.

    &lt;VulnDiscussion&gt;Real-time multicast traffic can entail multiple large flows of data. An attacker can flood a network segment with multicast p...
    Rule Low Severity
    Show

  • SRG-NET-000019-RTR-000014

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  • The Cisco multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Join messages received from the Designated Router (DR) for any undesirable multicast groups.

    &lt;VulnDiscussion&gt;Real-time multicast traffic can entail multiple large flows of data. An attacker can flood a network segment with multicast p...
    Rule Low Severity
    Show

  • SRG-NET-000362-RTR-000121

    <GroupDescription></GroupDescription>
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  • The Cisco multicast Rendezvous Point (RP) must be configured to rate limit the number of Protocol Independent Multicast (PIM) Register messages.

    &lt;VulnDiscussion&gt;When a new source starts transmitting in a PIM Sparse Mode network, the Designated Router (DR) will encapsulate the multicast...
    Rule Medium Severity
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