Prisma SD-WAN uses application response time to determine
the path a flow may take and confirms that the path adheres to the
Prisma SD-WAN uses application response
time to determine the path a flow may take and confirms that the
path adheres to the application SLA. Application response time is
a combination of
Network Transfer Time
Server Response Time
metrics and calculated for a flow on each path before a decision
is taken to send a flow on that path. These metrics reflect in the
The chart displays detailed information on the application transaction
time for each prefix within an application. It determines network
and server performance for a specific application, including information
from the moment the client generates a request to the time the server receives
the response in the cloud or the data center. It also takes into
account L1 – L3 and L4 – L7 characteristics of an application, including
end-to-end performance rather than just latency, jitter, and packet
drops for an application.
App Response Time
chart reports on a per-app
basis. Select at least one app to view the
Time by Path
table. The health of the selected paths
are indicated by color. You can view specific
associated with each application instance or service with transaction
or init failures. Refer to the above table to understand
descriptions on the different health states.
Using NTTn, RTT, SRT, and UDP-TRT metrics, this chart provides
information on the source of an under performing application.
Network Transfer Time (NTTn)
measure of network congestion. The amount of time it takes to transfer
incoming data from an external server to a local client.
Round Trip Time (RTT)
of network latency. RTT is measured only for TCP flows and defined
as the time taken between a forward and return related protocol
exchange; TCP SYN to SYN-ACK for outbound flows, TCP SYN-ACK to
ACK for inbound flows and the time between a data sequence and ACK
of that data sequence.
Thus, RTT is measured throughout the
life of a flow and not just at the TCP establishment. Measuring
RTT throughout the flows life allows the system to account for TCP
proxy devices like WAN optimization in the path, providing a more
accurate measurement of RTT.
Server Response Time
—The amount of
time it takes for the server to start transmitting data after it
has acknowledged the client’s request. SRT measured for TCP flows
only from the time request is received to the time the server sends the
first response packet.
UDP Response Time (UDP-TRT)
of time it takes for the server to respond to the UDP transaction
request from the time the request is received. Currently, UDP-TRT
provides information on UDP DNS traffic only.