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CHAPTER
23-1
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
23
Cisco IOS IP SLA
The Cisco IOS IP Service Level Agreements (SLAs) is a core part of the Cisco IOS software portfolio,
which allows Cisco customers to analyze IP service levels for IP applications and services, to increase
productivity, to lower operational costs, and to reduce the frequency of network outages.
The Cisco IOS IP SLAs uses active traffic monitoring—the generation of traffic in a continuous, reliable,
and predictable manner—for measuring network performance. Using Cisco IOS IP SLA, service
provider customers can measure and provide SLAs, and enterprise customers can verify service levels,
verify out sourced SLAs, and understand network performance.
The Cisco IOS IP SLAs can perform network assessments, verify quality of service (QoS), ease the
deployment of new services, and assist administrators with network troubleshooting.
The Cisco IOS IP SLAs can be accessed using the Cisco IOS CLI or Simple Network Management
Protocol (SNMP) through the Cisco Round-Trip Time Monitor (RTTMON) and syslog Management
Information Bases (MIBs).
For detailed information on Cisco IOS IP SLA features, see IP SLAs Configuration Guide, Cisco IOS
Release 15.1S.
Note Cisco IOS IP SLA for VoIP, ICMP Jitter, Gatekeeper and Data Link Switching Plus (DLSw+) features
are not supported in Cisco ASR 901 router.
Contents
• Configuring IPSLA Path Discovery, page 23-1
• Two-Way Active Measurement Protocol, page 23-5
• Configuring TWAMP, page 23-6
Configuring IPSLA Path Discovery
The LSP path discovery (LPD) feature allows the IP SLA MPLS LSP to automatically discover all the
active paths to the forwarding equivalence class (FEC), and configure LSP ping and traceroute
operations across various paths between the provide edge (PE) devices.
Complete the following steps to configure IPSLA path discovery in a typical VPN setup for MPLS LPD
operation: