Symptoms

Previous implementations of the QUIC profile did not provide an option to measure the path round-trip interval. In this release, QUIC includes an explicit signal to the network that allows observers to measure the path round-trip time. This can help network management.

Impact

No functionality for doing so.

Conditions

-- Using the QUIC profile. -- Attempting to measure the path round-trip interval.

Workaround

None.

Fix Information

In this release, you can use the 'Spin Bit' option to measure the path round-trip interval. When 'Spin Bit' is enabled in the QUIC profile, the BIG-IP system behaves in accordance with https://quicwg.org/base-drafts/draft-ietf-quic-transport.html#name-latency-spin-bit. The 'Spin Bit' option is on by default. Previously, BIG-IP systems did not provide this functionality.

Behavior Change

When 'Spin Bit' is enabled in the QUIC profile, the BIG-IP system behaves in accordance with https://quicwg.org/base-drafts/draft-ietf-quic-transport.html#name-latency-spin-bit. QUIC includes an explicit signal to the network that allows observers to measure the path round-trip time. This can help network management. This is on by default. Previously, BIG-IP systems did not provide this functionality.