Cisco NX OS Switch RTR Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-NET-000018-RTR-000005
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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 -
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 -
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 -
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 -
SRG-NET-000512-RTR-000001
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SRG-NET-000512-RTR-000002
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The Cisco MPLS switch 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 switches. It is easier to construct appropriate ingress filte...Rule Low Severity -
SRG-NET-000512-RTR-000003
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SRG-NET-000193-RTR-000001
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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 switch 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 -
SRG-NET-000512-RTR-000006
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SRG-NET-000512-RTR-000007
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SRG-NET-000343-RTR-000001
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SRG-NET-000512-RTR-000008
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SRG-NET-000512-RTR-000009
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SRG-NET-000193-RTR-000002
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SRG-NET-000362-RTR-000119
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SRG-NET-000192-RTR-000002
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SRG-NET-000205-RTR-000007
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SRG-NET-000205-RTR-000008
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The Cisco PE switch must be configured with Unicast Reverse Path Forwarding (uRPF) loose mode enabled on all CE-facing interfaces.
The uRPF feature is a defense against spoofing and denial-of-service (DoS) attacks by verifying if the source address of any ingress packet is reachable. To mitigate attacks that rely on forged sou...Rule Medium Severity -
SRG-NET-000205-RTR-000016
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SRG-NET-000193-RTR-000113
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SRG-NET-000193-RTR-000114
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SRG-NET-000193-RTR-000112
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SRG-NET-000019-RTR-000003
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SRG-NET-000019-RTR-000004
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The Cisco multicast switch must be configured to bind a Protocol Independent Multicast (PIM) neighbor filter to interfaces that have PIM enabled.
PIM is a routing protocol used to build multicast distribution trees for forwarding multicast traffic across the network infrastructure. PIM traffic must be limited to only known PIM neighbors by c...Rule Medium Severity -
SRG-NET-000019-RTR-000005
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SRG-NET-000362-RTR-000120
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The Cisco multicast Rendezvous Point (RP) switch must be configured to limit the multicast forwarding cache so that its resources are not saturated by managing an overwhelming number of Protocol Independent Multicast (PIM) and Multicast Source Discovery Protocol (MSDP) source-active entries.
MSDP peering between networks enables sharing of multicast source information. Enclaves with an existing multicast topology using PIM-SM can configure their RP switches to peer with MSDP switches. ...Rule Low Severity -
SRG-NET-000019-RTR-000013
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The Cisco multicast Rendezvous Point (RP) switch must be configured to filter Protocol Independent Multicast (PIM) Register messages received from the Designated switch (DR) for any undesirable multicast groups and sources.
Real-time multicast traffic can entail multiple large flows of data. An attacker can flood a network segment with multicast packets, over-using the available bandwidth and thereby creating a denial...Rule Low Severity -
SRG-NET-000019-RTR-000014
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SRG-NET-000364-RTR-000114
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The Cisco multicast Designated switch (DR) must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join only multicast groups that have been approved by the organization.
Real-time multicast traffic can entail multiple large flows of data. Large unicast flows tend to be fairly isolated (i.e., someone doing a file download here or there), whereas multicast can have b...Rule Low Severity -
SRG-NET-000364-RTR-000115
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SRG-NET-000362-RTR-000122
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SRG-NET-000362-RTR-000123
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The Cisco multicast Designated switch (DR) must be configured to set the shortest-path tree (SPT) threshold to infinity to minimalize source-group (S, G) state within the multicast topology where Any Source Multicast (ASM) is deployed.
ASM can have many sources for the same groups (many-to-many). For many receivers, the path via the RP may not be ideal compared with the shortest path from the source to the receiver. By default, t...Rule Medium Severity -
SRG-NET-000364-RTR-000116
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The Cisco Multicast Source Discovery Protocol (MSDP) switch must be configured to only accept MSDP packets from known MSDP peers.
MSDP peering with customer network switches presents additional risks to the DISN Core, whether from a rogue or misconfigured MSDP-enabled switch. To guard against an attack from malicious MSDP tra...Rule Medium Severity
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