HP 5920 Series Command Reference Manual page 49

Parameters
fka-adv-period: Specifies an FKA advertisement interval value in the range of 4 to 600 seconds.
Usage guidelines
The FKA advertisement interval determines the length of time the switch takes to detect the disconnection
of a virtual link.
The FKA advertisement interval defines the interval for a switch to send unsolicited Discovery
Advertisements to its peer switches or ENodes. If the peer switch or ENode fails to receive unsolicited
Discovery Advertisements within 2.5 FKA advertisement intervals, it deletes the virtual link. The FKA
advertisement interval is carried in received unsolicited Discovery Advertisements instead of being
configured on the local switch. If the switch fails to receive keepalive frames from the peer ENode within
2.5 FKA advertisement intervals, it also deletes the virtual link.
When configuring the FKA advertisement interval value on an FCF or NPV switch, use
reference to avoid service disruption.
Table 13 Recommended values for different application scenarios
Recommended
value
Less than 90
seconds
Application scenarios
Connected to servers, storage
devices, or third-party switches.
Remarks
According to FC-BB-5, the upper limit of the FKA
advertisement interval value is 90 seconds. In this
scenario, an FCF switch or NPV switch operating in
standalone mode or in IRF mode but without subordinate
switches will experience FCoE traffic disruption during
an ISSU reboot for the following reasons:
•
The ISSU reboot takes more than 225 (2.5*90)
seconds.
•
The peer deletes the virtual link for failing to receive
unsolicited Discovery Advertisements within 225
seconds.
You must adjust the FKA advertisement interval value on
the upstream FCF switch to ensure service continuity in
either of the following situations:
•
An active/standby switchover on an NPV switch
•
An ISSU reboot on an IRF member NPV switch with
subordinate switches.
The preceding steps are required for the following
reasons:
•
The FKA advertisement interval value configured on
the NPV switch affects only its VFC interfaces in F
mode and connected ENodes.
•
The VFC interfaces in NP mode of the NPV switch use
the FKA advertisement interval value learned from
the upstream FCF switch.
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Table 13 as a