Service Entities
Page 44 7210 SAS M Services Guide
ping is used in the SDP keepalive application, the SDP echo request and echo reply messages are a
mechanism for exchanging far-end SDP status.
Configuring SDP keepalives on a given SDP is optional. SDP keepalives for a particular SDP have
the following configurable parameters:
• Admin up/admin down state
• Hello time
• Message length
• Max drop count
• Hold down time
SDP keepalive echo request messages are only sent when the SDP is completely configured and
administratively up and SDP keepalives is administratively up. If the SDP is administratively
down, keepalives for the SDP are disabled.
SDP keepalive echo request messages are sent out periodically based on the configured Hello
Time. An optional message length for the echo request can be configured. If max drop count echo
request messages do not receive an echo reply, the SDP will immediately be brought operationally
down.
If a keepalive response is received that indicates an error condition, the SDP will immediately be
brought operationally down.
Once a response is received that indicates the error has cleared and the hold down time interval has
expired, the SDP will be eligible to be put into the operationally up state. If no other condition
prevents the operational change, the SDP will enter the operational state.
For information about configuring keepalive parameters, refer to Configuring an SDP on page 71.
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