R21xx-HP FlexFabric 11900 FCoE Configuration Guide

14
Ste
p
Command Remarks
2. Configure an FC-MAP
value.
fcoe fcmap fc-map The default setting is 0x0EFC00.
Configuring the FKA advertisement period value
FKA advertisement period determines the length of time it takes the switch to detect the disconnection of
a virtual link can be detected.
• After setting up a virtual link with a peer switch, a switch sends unsolicited Discovery
Advertisements every FKA advertisement period on its VFC interfaces in E mode to maintain the
established virtual link. The FKA advertisement period value is carried in unsolicited Discovery
Advertisements. After receiving an unsolicited Discovery Advertisement, the peer switch maintains
the status of the virtual link and records the FKA advertisement period value. If the peer switch fails
to receive an unsolicited Discovery Advertisement within 2.5 FKA advertisement periods, it deletes
the virtual link.
• After setting up a virtual link with a peer ENode, the switch sends unsolicited Discovery
Advertisements every FKA advertisement period on its VFC interfaces in F mode to maintain the
established virtual link. The FKA advertisement period value is carried in unsolicited Discovery
Advertisements. After receiving an unsolicited Discovery Advertisement, the peer ENode maintains
the status of the virtual link and records the FKA advertisement period value. If the peer ENode fails
to receive an unsolicited Discovery Advertisement within 2.5 FKA advertisement periods, it deletes
the virtual link. In addition, the ENode sends keepalive frames to the switch every FKA
advertisement period value (this value is obtained from unsolicited Discovery Advertisements
received from the switch). After receiving a 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 periods, it
deletes the virtual link.
When configuring the FKA advertisement period 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 period value is 90 seconds. In this
scenario, a single-MPU FCF switch or NPV switch will
experience FCoE traffic disruption during an ISSU
reboot, because this ISSU reboot takes more than 225
(2.5*90) seconds and the peer deletes the virtual link for
failing to receive unsolicited Discovery Advertisements
within 225 seconds.
To ensure service continuity during an active/standby
switchover on an NPV switch or ISSU reboot on a
dual-MPU NPV switch, you must also adjust the FKA
advertisement period value on the upstream FCF switch.
This is because the FKA advertisement period value
configured on the NPV switch affects only its VFC
interfaces in F mode and connected ENodes, and its
VFC interfaces in NP mode use the FKA advertisement
period value learned from the upstream FCF switch.