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The HP FlexFabric Switch must ensure all Exterior Border Gateway Protocol (eBGP) HP FlexFabric Switches are configured to use Generalized TTL Security Mechanism (GTSM).


Finding ID Version Rule ID IA Controls Severity
V-66133 HFFS-RT-000023 SV-80623r1_rule Medium
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.
HP FlexFabric Switch RTR Security Technical Implementation Guide 2020-06-03


Check Text ( C-66779r1_chk )
Review the HP FlexFabric Switch configuration.

If the HP FlexFabric Switch is not configured to use GTSM for all eBGP peering sessions, this is a finding.

[HP] display current-configuration
bgp 2000
peer as-number 2000
peer ttl-security hops 254
peer as-number 1473
peer route-update-interval 0
peer password cipher $c$3$6jyBDW1nVs/F0410R54zhmhD1HYhs5I=
peer 2115:B:1::C1 as-number 1473
peer 2115:B:1::C1 route-update-interval 0
Fix Text (F-72209r1_fix)
Configure all eBGP peering sessions to use GTSM.

[HP] bgp 2000
[HP-bgp] peer as-number 2100
[HP-bgp] peer ttl-security hops 254