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Configuration procedure 
1.  Configure IPv6 addresses for interfaces. (Details not shown.) 
2.  Configure IPv6 IS-IS: 
# Configure Router A. 
<RouterA> system-view 
[RouterA] isis 1 
[RouterA-isis-1] is-level level-1 
[RouterA-isis-1] network-entity 10.0000.0000.0001.00 
[RouterA-isis-1] ipv6 enable 
[RouterA-isis-1] quit 
[RouterA] interface ethernet 1/1 
[RouterA-Ethernet1/1] isis ipv6 enable 1 
[RouterA-Ethernet1/1] quit 
# Configure Router B. 
<RouterB> system-view 
[RouterB] isis 1 
[RouterB-isis-1] is-level level-1 
[RouterB-isis-1] network-entity 10.0000.0000.0002.00 
[RouterB-isis-1] ipv6 enable 
[RouterB-isis-1] quit 
[RouterB] interface ethernet 1/1 
[RouterB-Ethernet1/1] isis ipv6 enable 1 
[RouterB-Ethernet1/1] quit 
# Configure Router C. 
<RouterC> system-view 
[RouterC] isis 1 
[RouterC-isis-1] network-entity 10.0000.0000.0003.00 
[RouterC-isis-1] ipv6 enable 
[RouterC-isis-1] quit 
[RouterC] interface ethernet 1/1 
[RouterC-Ethernet1/1] isis ipv6 enable 1 
[RouterC-Ethernet1/1] quit 
[RouterC] interface ethernet 1/2 
[RouterC-Ethernet1/2] isis ipv6 enable 1 
[RouterC-Ethernet1/2] quit 
[RouterC] interface ethernet 1/3 
[RouterC-Ethernet1/3] isis ipv6 enable 1 
[RouterC-Ethernet1/3] quit 
# Configure Router D. 
<RouterD> system-view 
[RouterD] isis 1  
[RouterD-isis-1] is-level level-2 
[RouterD-isis-1] network-entity 20.0000.0000.0004.00 
[RouterD-isis-1] ipv6 enable 
[RouterD-isis-1] quit 
[RouterD] interface ethernet 1/1 
[RouterD-Ethernet1/1] isis ipv6 enable 1