Two-Way Active Measurement Protocol (TWAMP)

The Cloud-Native Router supports Two-Way Active Management Protocol (TWAMP) for network performance measurement and monitoring in 5G transport networks. It supports managed and light TWAMP.

The Two-Way Active Management Protocol (TWAMP), described in RFC 5357, is a network performance measurement and monitoring service used for active performance monitoring of 5G transport networks. TWAMP is an extension of the One-Way Active Management Protocol (OWAMP) providing two-way or round-trip measurements instead of unidirectional capabilities. Two-way measurements do not require local and remote clock synchronization. The remote host support can be limited to a simple echo function. TWAMP defines an open protocol for measuring two-way or round-trip metrics with greater accuracy than other methods by using time-stamps, while accounting for processing delays. Please review Understanding Two-Way Active Measurement Protocol topic for more details.

Juniper Cloud-Native Router supports two flavors of TWAMP implementation:

• Managed TWAMP—A TCP control connection is established between control client and responder server for exchanging test session information. Measurement and monitoring tests run between session-sender and session-reflector.
• Light TWAMP—No control connection is established between the control client and responder server. The session-sender directly runs measurement and monitoring tests with the session-reflector. The session-reflector has no knowledge of the session state.

Cloud-Native Router supports timestamping the TWAMP test packets by either the cRPD or vRouter. The cRPD timestamps are enabled by default. Since the Round Trip Time (RTT) for cRPD timestamps has higher jitter due to latency in the host network stack, vRouter timestamps may be preferred. The vRouter uses hardware timestamping if the underlying NIC supports it, else it defaults to the kernel system clock.