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XCCDF
HP FlexFabric Switch RTR Security Technical Implementation Guide
SRG-NET-000191-RTR-000081
The HP FlexFabric Switch must ensure all Exterior Border Gateway Protocol (eBGP) HP FlexFabric Switches are configured to use Generalized TTL Security Mechanism (GTSM).
The HP FlexFabric Switch must ensure all Exterior Border Gateway Protocol (eBGP) HP FlexFabric Switches are configured to use Generalized TTL Security Mechanism (GTSM).
An XCCDF Rule
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Prose
The HP FlexFabric Switch must ensure all Exterior Border Gateway Protocol (eBGP) HP FlexFabric Switches are configured to use Generalized TTL Security Mechanism (GTSM).
Medium Severity
As described in RFC 3682, GTSM is designed to protect a router's IP-based control plane from DoS attacks. Many attacks focused on CPU load and line-card overload can be prevented by implementing GTSM on all eBGP speaking routers. GTSM is based on the fact that the vast majority of control plane peering is established between adjacent routers; that is, the eBGP peers are either between connecting interfaces or between loopback interfaces. Since TTL spoofing is considered nearly impossible, a mechanism based on an expected TTL value provides a simple and reasonably robust defense from infrastructure attacks based on forged control plane traffic.