Services Overview
7705 SAR OS Services Guide Page 117
SDP Keepalive Commands
keep-alive
Syntax keep-alive
Context config>service>sdp
Description This command is the context for configuring SDP connectivity monitoring keepalive messages for the
SDP-ID.
SDP-ID keepalive messages use SDP Echo Request and Reply messages to monitor SDP
connectivity. The operating state of the SDP is affected by the keepalive state on the SDP-ID. SDP
Echo Request messages are only sent when the SDP-ID is completely configured and
administratively up. If the SDP-ID is administratively down, keepalives for that SDP-ID are disabled.
SDP Echo Requests, when sent for keepalive messages, are always sent with the originator-sdp-id.
All SDP-ID keepalive SDP Echo Replies are sent using generic IP OAM encapsulation.
When a keepalive response is received that indicates an error condition, the SDP ID 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 ID will be eligible to be put into the operationally
up state. If no other condition prevents the operational change, the SDP ID will enter the operational
state.
A set of event counters track the number of keepalive requests sent, the size of the message sent, non-
error replies received and error replies received. A keepalive state value is kept, indicating the last
response event. A keepalive state timestamp value is kept, indicating the time of the last event. With
each keepalive event change, a log message is generated, indicating the event type and the timestamp
value.
Table 12 describes keepalive interpretation of SDP Echo Reply response conditions and the effect on
the SDP ID operational status.
Table 12: SDP Echo Reply Response Conditions
Result of Request Stored Response State Operational State
keepalive request timeout without reply Request Timeout Down
keepalive request not sent due to non-
existent orig-sdp-id
(1)
Orig-SDP Non-Existent Down
keepalive request not sent due to
administratively down orig-sdp-id
Orig-SDP Admin-Down Down
keepalive reply received, invalid
origination-id
Far End: Originator-ID Invalid Down
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