Chapter 46: Command Line Descriptions
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
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configure router isis address-family ipv6 enable
Indicates to IS-IS neighbors that the C4 CMTS supports IPv6 TLVs.
configure router isis address-family ipv6 enable
configure router isis address-family ipv6 enable no
To turn off, use the no option.