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Cisco Bug: CSCus68673 - IPv6 DHCP server writes zero-byte database file to local flash

Last Modified

Jan 24, 2019

Products (16)

  • Cisco IOS
  • Cisco ASR 901-6CZ-FS-D Router
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
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Known Affected Releases


Description (partial)

A Cisco router acting as a DHCPv6 server, with the DHCPv6 persistent database feature enabled, may write a zero-byte database file to the local filesystem.

When the system attempts to store DHCPv6 bindings to this zero-byte database, this creates an error condition that will eventually cause the system to crash.

This will occur if the DHCPv6 persistent database feature is configured, and the database file is stored on a local flash device. A line similar to the following will be present in global config:

ipv6 dhcp database flash:dhcpv6-binding-agent-database
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