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Why does SWIM require Cisco IOS Software Release 11.1 or later to run on a Single Flash Bank (SFB) device for an upgrade when you have configured the device with Frame Relay subinterfaces?

April 26, 2017Cisco IOS later release require run Software swim

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Why does SWIM require Cisco IOS Software Release 11.1 or later to run on a Single Flash Bank (SFB) device for an upgrade when you have configured the device with Frame Relay subinterfaces?

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A. Releases earlier than Cisco IOS Software Release 11.1 do not include Frame Relay subinterfaces in ifTable and ipRouteTable in RFC 1213 . SWIM requires information from these tables to perform Rxboot mode upgrades. Therefore, SWIM requires Cisco IOS Software Release 11.1 or later to run on an SFB device when the device has Frame Relay subinterfaces.