Explains LPTS packet delivery, flow capacity, policers, NPU traps, and control and management plane ACLs. Provides configuration, monitoring, verification, tuning, and traffic-filtering guidance for protecting router-bound traffic.
Local Packet Transport Services (LPTS) is a Cisco IOS XR subsystem that
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delivers packets that are destined for router applications to the correct route processor
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protects control plane resources through flow policers and Network Processing Unit (NPU) trap policers, and
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supports flow-capacity controls and ACLs for router-bound traffic.
This chapter describes LPTS components, dynamic flows, policers, NPU traps, and user-managed control and management plane ACLs.
LPTS components and packet delivery
Describes the port arbitrator, flow managers, and IFIB that identify router-bound packet flows and deliver accepted packets to the correct route processor for application processing.
LPTS policers
Explains how ingress policers protect the route processor by rate-limiting control traffic by flow type. Covers global and per-node configuration, effective hardware rates, CLI verification, and YANG statistics.
NPU traps
Explains the exception, error, and non-LPTS control packets represented by NPU traps. Covers per-NPU policing, accepted and dropped counters, trap-statistics monitoring, and configurable trap policers.
Control and management plane ACLs
Explains how a virtual LPTS interface and compressed hybrid ACLs filter and police control and management plane traffic. Covers limitations, best practices, configuration, verification, and IPv6 AH and ESP support.