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Cisco Bug: CSCvv55066 - FPR1010: Internal-Data0/0 and data interfaces are flapping during SMB file transfer

Last Modified

Oct 17, 2020

Products (1)

  • Cisco Firepower 9300 Series

Known Affected Releases

2.6(1.133) 2.7(1.117) 2.8(1.129) 2.9(1) r2101 r271 r281 r291

Description (partial)

The Internal-Data0/0 interface is flapping during SMB file transfer and the following syslog message is being generated:
Aug 29 2020 09:50:22: %FTD-4-411002: Line protocol on Interface Internal-Data0/0, changed state to down
Aug 29 2020 09:50:24: %FTD-4-411001: Line protocol on Interface Internal-Data0/0, changed state to up 

In addition, when Internal-Data0/0 interface is down, all data interfaces have the same state:
firepower# sh int ip brief 
Interface                  IP-Address      OK?           Method Status      Protocol
Internal-Data0/0           unassigned      YES           unset  down        down <
Ethernet1/1          YES           CONFIG down        down <
Ethernet1/2           YES           CONFIG down        down <
Ethernet1/3          YES           CONFIG down        down <

This defect may cause several connectivity issues including VPN flaps and connection drops.

ASA or FTD is deployed on the FPR1010 platform. 
SMB traffic through the firewall is being forwarded.
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