statefull ipv6 dhcp _router as a_server

[rawiahummori8737]

i can't implement the following command in Cisco 1941, 4321 routers :

router(config-if)#ipv6 nd prefix default no-autoconfig

?

i need help

[Harold Ritter]

Is the command not available? What IOS version are you running? Can you type the following:

ipv6 nd prefix ? 

and see what are the options.

Regards,

[rawiahummori8737]

Ios ,  15.1(4)

Cisco 1900-universal k9-mz.SPA.151-4.M4.bin 

And 

Ios ,isr4300-universalk9.03.16.05.S.155-ext.SPA.bin

I cannot  type ipv6 nd prefix. It is unrecognized command in ios 15.1

And it is appear as invalid input in 16.05

[rawiahummori8737]

---

After typing ipv6 nd ?

Managed-config-flag

Other-config-flag

Ra 

No prefix .