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Cisco NX OS Switch RTR Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000018-RTR-000005

    Group
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  • The Cisco BGP switch must be configured to reject outbound route advertisements for any prefixes that do not belong to any customers or the local autonomous system (AS).

    Advertisement of routes by an autonomous system for networks that do not belong to any of its customers pulls traffic away from the authorized network. This causes a denial of service (DoS) on the ...
    Rule Medium Severity
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  • SRG-NET-000205-RTR-000006

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  • The Cisco BGP switch 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
    Show

  • SRG-NET-000018-RTR-000006

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  • SRG-NET-000018-RTR-000010

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  • The Cisco BGP switch must be configured to reject route advertisements from CE switches with an originating AS in the AS_PATH attribute that does not belong to that customer.

    Verifying the path a route has traversed will ensure that the local AS is not used as a transit network for unauthorized traffic. To ensure that the local AS does not carry any prefixes that do not...
    Rule Low Severity
    Show

  • SRG-NET-000362-RTR-000117

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  • SRG-NET-000362-RTR-000118

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  • The Cisco BGP switch 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 switch 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
    Show

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