Updated December 17, 1998
December 11, 1998
With Y.A.C. or later firmware loaded prior to upgrade to 9.1
With Z.A.H. or later firmware loaded prior to upgrade to 9.1
With Z.A.H. or later firmware loaded prior to upgrade to 9.1.
The Universal Frame Relay Module C (UFM-C) and Universal Frame Relay Module U (UFM-U) show mismatched backcards after upgrading from either 8.2.5 or 8.5 to the 9.1 release. The mismatch occurs when either an UFM-C or an UFM-U with firmware that supports the new Hot Standby 9.1 feature is installed in a node operating with either 8.2.5 or 8.5 switch software. The firmware that supports Hot Standby is listed in the Products Affected section of this Field Notice.
The most observable symptom is seen in the dspcds or dspcd slot_number screens:
node TN StrataCom IGX 8420 9.1.04 Nov. 20 1998 20:12 PST
Missing Cards: 2 UFMs, 2 E1Bs
FrontCard BackCard FrontCard BackCard
Type Rev Type Rev Status Type Rev Type Rev Status
1 NPM BWJ Active-T 9 Empty universal backplane
2 NPM BWP Standby 10 CVM BH13 E1 AN Active
3 Empty universal backplane 11 Empty universal backplane
4 Empty universal backplane 12 UFMU ADE V35 AA Active
5 Empty universal backplane 13 UFM AE12 E1B AB Mismatch
6 BTM BDL BTM-E3 AF Active 14 UFM AE12 E1B AA Mismatch
7 Empty universal backplane 15 FRM EHZ FRI-T1 AL Active-T
8 FRM EJZ FRI-E1 AF Active-T 16 ARM BA ARI --- Standby
Switch Software Release 9.1 introduced an Availability feature on the UFM-C and the UFM-U called Hot Standby which allows Y-redundant pairs to switch over more quickly, thus reducing impact to customer data traversing the Y-redundant UFM when a switchover occurs. The Hot Standby feature on the UFM is implemented by upgrading both firmware and software.
Releases 8.2.5 and 8.5 do not support the Hot Standby feature. During an upgrade from these releases to 9.1, the flags for Hot Standby in 9.1 are set incorrectly, triggering the IGX to report the backcard mismatch state.
There are two workarounds.
Upgrade the UFM firmware (with Hot Standby support) only after upgrading the software to 9.1.
Delete the y-redundancy (delyred primary_slot_number) before upgrading the software to 9.1, and re-add (addyred primay_slot_number secondary_slot_number) it after upgrading to 9.1.
The first workaround is preferred and easier to implement. The second workaround should be used only if the user has already upgraded the UFM firmware, but has not yet upgraded the switch software to 9.1.
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View CSCdk68018 (registered customers only)
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