IS-IS IPv6 Cisco IOS

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For generel IS-IS and IS-IS for Ipv4 see IS-IS

Configuring IPv6 IS-IS

Example

float
hostname R1
!
router isis
 address-family ipv6
  redistribute static
 exit-address-family
 net 49.0001.1921.6801.0001.00
!
interface fastethernet0/0
 address 2001:410:ffff:1::1/64
 ipv6 router isis 
 isis circuit-type level-2-only

IPv6 IS-IS through IPv4 only islands

Because IS-IS uses CLNP and not IPv6 a standard IPv6-over-IPv4-Tunnel can't be used. A GRE tunnel through IPv4 is necessary.

router isis
 net 49.0001.1921.6801.0001.00
!
interface tunnel0
 ipv6 address 2001:410:ffff:1::1/64
 tunnel source ethernet0
 tunnel destination 132.214.1.3
 tunnel mode gre ipv6
 ipv6 router isis