keepalive
config>service>sdp
Supported on all 7210 SAS platforms as described in this document
Commands in this context configure 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 sent only 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 is immediately brought operationally down. When a response is received that indicates the error has cleared and the hold-down-time interval has expired, the SDP ID is eligible to be put into the operationally up state. If no other condition prevents the operational change, the SDP ID enters 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.
The following table describes the keepalive interpretation of SDP echo reply response conditions and the effect on the SDP ID operational status.
| Result of request | Stored response state | Operational state |
|---|---|---|
keepalive request timeout without reply |
Request Timeout |
Down |
keepalive request not sent because of non-existent orig-sdp-id1 |
Orig-SDP Non-Existent |
Down |
keepalive request not sent because of administratively down orig-sdp-id |
Orig-SDP Admin-Down |
Down |
keepalive reply received, invalid origination-id |
Far End: Originator-ID Invalid |
Down |
keepalive reply received, invalid responder-id |
Far End: Responder-ID Error |
Down |
keepalive reply received, No Error |
Success |
Up (If no other condition prevents) |
hello-time seconds
no hello-time
config>service>sdp>keep-alive
Supported on all 7210 SAS platforms as described in this document
This command configures the time period between SDP keepalive messages on the SDP-ID for the SDP connectivity monitoring messages.
The no form of this command reverts the hello-time seconds value to the default.
hello-time 10
Specifies the time in seconds between SDP keepalive messages, expressed as a decimal integer.
hold-down-time seconds
no hold-down-time
config>service>sdp>keep-alive
Supported on all 7210 SAS platforms as described in this document
This command configures the minimum time period the SDP remains in the operationally down state in response to SDP keepalive monitoring.
This parameter can be used to prevent the SDP operational state from ‟flapping” by rapidly transitioning between the operationally up and operationally down states based on keepalive messages.
When an SDP keepalive response is received that indicates an error condition or the max-drop-count keepalive messages receive no reply, the sdp-id is immediately brought operationally down. If a keepalive response is received that indicates the error has cleared, the sdp-id is eligible to be put into the operationally up state only after the hold-down-time interval has expired.
The no form of this command reverts to the default value.
hold-down-time 10
Specifies the time in seconds, expressed as a decimal integer, the sdp-id remains in the operationally down state before it is eligible to enter the operationally up state. A value of 0 indicates that no hold-down-time is enforced for sdp-id.
max-drop-count count
no max-drop-count
config>service>sdp>keep-alive
Supported on all 7210 SAS platforms as described in this document
This command configures the number of consecutive SDP keepalive failed request attempts or remote replies that can be missed after which the SDP is take operationally down. If the max-drop-count consecutive keepalive request messages cannot be sent or no replies are received, the SDP-ID is taken operationally down by the keepalive SDP monitoring.
The no form of this command reverts to the default value.
max-drop-count 3
Specifies he number of consecutive SDP keepalive requests that are failed to be sent or replies missed, expressed as a decimal integer.
message-length octets
no message-length
config>service>sdp>keep-alive
Supported on all 7210 SAS platforms as described in this document
This command configures the SDP monitoring keepalive request message length that is transmitted.
The message length should be equal to the SDP operating path MTU, as configured in the path-mtu command. If the default size is overridden, the actual size used is the smaller of the operational SDP-ID Path MTU and the size specified.
The no form of this command reverts the default value.
message-length 0
Specifies the size of the keepalive request messages in octets, expressed as a decimal integer. The size keyword overrides the default keepalive message size.
timeout timeout
no timeout
config>service>sdp>keep-alive
Supported on all 7210 SAS platforms as described in this document
This command configures the time interval that the SDP waits before tearing down the session.
timeout 5
Specifies the timeout time, in seconds.