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In my Cisco Packet Tracer, I have a ISR4321 router:

Router1(config-router)#neighbor 12.0.0.2 update-source lo0
                                         ^
% Invalid input detected at '^' marker.

I have two questions there:

1) I cannot use update-source param in my neighbor command.
2) You see my command neighbor 12.0.0.2 update-source lo0, is the lo0 stands for the Router1's loopback 0 or the its peer's loopback 0?

  • neighbor 12.0.0.2 update-source lo0 is your routers loopback 0 interface. – user36472 Apr 1 at 7:50
  • You see the command is based on Router1. – 244boy Apr 1 at 7:53
  • Yes the loopback 0 interface is on Router 1. – user36472 Apr 1 at 8:00
  • Why I can not use update-source param in my neighbor command? – 244boy Apr 2 at 7:04
  • Packet Tracer doesn't support update-source on the neighbor command. It's made to only give a basic baseline of how to configure and setup network equipment. You cannot expect every feature to be available, that's also why you would always need a proper testlab. – user36472 Apr 2 at 7:13
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1) I cannot use update-source param in my neighbor command.

Packet Tracer doesn't support update-source on the neighbor command. It's made to only give a basic baseline of how to configure and setup network equipment. You cannot expect every feature to be available, that's also why you would always need a proper testlab.

2) You see my command neighbor 12.0.0.2 update-source lo0, is the lo0 stands for the Router1's loopback 0 or the its peer's loopback 0?

neighbor 12.0.0.2 update-source lo0 yes, loopback 0 is the interface on Router 1.

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