Summary
This document provides an overview of the operation, configuration, and monitoring of Selective Packet Discard (SPD). It builds on this fundamental information with actionable technical details that can help network engineers implement SPD in an environment composed of differing hardware platforms and IOS releases.In today's complex internetworks, various types of network traffic compete for the finite resources of a router. These might include an interior routing protocol such as Open Shortest Path First (OSPF) or Enhanced Interior Gateway Routing Protocol (EIGRP), network management traffic, and Border Gateway Protocol (BGP). SPD was designed to help ensure that network stability was not undermined during periods of high CPU-bound traffic. Although the safeguards added by SPD are typically applied to the BGP reconvergence use case, they are relevant to security when viewed in the context of availability.
SPD achieves its goals using two techniques: the provisioning of additional queuing capacity for control plane traffic and the implementation of a simple congestion-control mechanism for the interface input queues.
Reference:http://www.cisco.com/web/about/security/intelligence/spd.html
http://www.cisco.com/en/US/products/hw/routers/ps167/products_tech_note09186a008012fb87.shtml
No comments:
Post a Comment