H3C Technologies H3C S10500 Series Switches - Manual (Page 30)

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keepalive frame, the switch maintains the status of the virtual link. If the switch fails to receive a keepalive
frame within 2.5 FKA advertisement intervals, it deletes the virtual link.
Configuration guidelines
When setting the FKA advertisement interval value on an FCF or NPV switch, use Table 2 as a reference
to avoid service disruption.
Table 2 Recommended values for different application scenarios
Recommended
value
Application scenarios Remarks
Less than 90
seconds Connected to servers, storage
devices, or third-party switches.
According to FC-BB-5, the upper limit of the FKA
advertisement interval is 90 seconds. In this scenario, a
single-MPU FCF switch or NPV switch will experience
FCoE traffic disruption during an ISSU reboot because
of the following reasons:
• This 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 also adjust the FKA advertisement interval on
the upstream FCF switch to ensure service continuity in
the following cases:
• An active/standby switchover on an NPV switch.
• An ISSU reboot on a dual-MPU NPV switch.
You must do that for the following reasons:
• The FKA advertisement interval set on the NPV switch
affects only its VFC interfaces in F mode and
connected ENodes.
• Its VFC interfaces in NP mode use the FKA
advertisement interval learned from the upstream
FCF switch.
60–90 seconds
Active/standby switchover on
the switch takes more than 2.5 x
60 seconds because of the
amount of FCoE configuration.
ISSU reboot on a dual-MPU
switch takes more than 2.5 x 60
seconds because of the amount
of FCoE configuration.
For more information about ISSU, see Fundamentals
Configuration Guide.
300–600
seconds
ISSU reboot on a single-MPU
switch to which no nodes are
attached.
During an ISSU reboot on a single-MPU switch, the
switch cannot send unsolicited Discovery
Advertisements or keepalive frames.
Configuration procedure
To set an FKA advertisement interval value: