Overview ! 75
Chapter 3
Creating Rate-Limit Profiles
This chapter provides information for configuring rate-limit policy management on
E-series routers.
This chapter discusses the following topics:
! Overview on page 75
! Platform Considerations on page 76
! Rate Limits on page 76
! Hierarchical Rate Limits on page 77
! One-Rate Rate-Limit Profiles on page 88
! Two-Rate Rate-Limits on page 91
! Bandwidth Management on page 102
For information on monitoring rate-limit profiles, see Chapter 5, Monitoring Policy
Management.
Overview
Rate limiting is the process of limiting a classified packet flow or a source interface
to a rate that is less than the physical rate of the port. An E-series router’s rate limits
are calculated based on the layer 2 packet size.
Rate limiting enforces data rates below the physical line rate of a port for an IP
interface, a classified packet flow, or a Layer 2 interface. You implement rate
limiting by configuring a rate-limit profile that specifies bandwidth attributes and
actions.
You can configure rate-limit profiles to provide a variety of services, including tiered
bandwidth service where traffic conforming to configured bandwidth levels is
treated differently than traffic that exceeds the configured values, and a hard-limit
service where a fixed bandwidth limit is applied to a traffic flow. You can also
configure rate-limit profiles to provide a TCP-friendly rate-limiting service that
works in conjunction with TCP’s native flow-control functionality.
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