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S/N-Series f/w 7.21.01.0015 Loopback Interface always shows 'ipv6 forwarding'

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TitleS/N-Series f/w 7.21.01.0015 Loopback Interface always shows 'ipv6 forwarding'
Symptoms
  • After creating a loopback interface, a display of the interface shows that it is enabled for IPv6 forwarding.
  • IPv6 forwarding is automatically enabled and cannot be disabled.
For example:

S4(su)->config t
S4(su-config)->interface loop.0.1
S4(su-config-intf-loop.0.1)->ip address 8.8.8.2 255.255.255.255 primary
S4(su-config-intf-loop.0.1)->no ipv6 forwarding
S4(su-config-intf-loop.0.1)->no shutdown
S4(su-config-intf-loop.0.1)->exit
S4(su-config)->show running-config
configure terminal 
! 
 interface loop.0.1 
  ip address 8.8.8.2 255.255.255.255 primary 
  ipv6 forwarding
  no shutdown 
  exit
!
exit
!
S4(su-config)->exit
S4(su)->
Environment
  • S-Series 
  • Firmware 7.21.01.0015 through 7.22.02.0001
  • Matrix N-Series DFE 
  • Firmware 7.21.01.0015 through 7.21.03.0003
Cause
  • This is standard for the above-stated products and firmware ranges. It has no harmful effect.
  • As of firmware 7.31.03.0010, the 'ipv6 forwarding' command has been removed, for loopback interfaces.
  • IPv6 forwarding on these interfaces is now determined from the context of other IPv6 commands (e.g. 'ipv6 address...').
  • If the 'ipv6 forwarding' command exists on a loopback interface from older firmware and the text version of the configuration is loaded into a system running newer firmware, an error message ('Error: Unknown: "forwarding"') will be generated by the CLI Editor when the command is parsed.
Resolution
Functions as Designed (FAD).
Additional notes

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