IS-IS IPv6 Cisco IOS

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

Configuring IPv6 IS-IS

Example

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
 ip address 222.2.2.2 255.255.255.0
 ipv6 address 2001:410:ffff:1::1/64
 tunnel source ethernet0
 tunnel destination 132.214.1.3
 tunnel mode gre ip
 ip router isis
 ipv6 router isis
 isis circuit-type level-2-only

Testing

CLNS throgh tunnel

R7#<input>show clns neighbors</input>
System Id      Interface   SNPA                State  Holdtime  Type Protocol
Hold8          Fa0/0       001b.548b.3f82      Up     27        <notice>L2</notice>   IS-IS
R6       <notice>Tu10</notice>        192.168.220.1       Up     28        <notice>L2</notice>   IS-IS

Testing

R7#<input>traceroute clns  49.0000.1921.6821.7002.00</input>

Type escape sequence to abort.
Tracing the route to 49.0000.1921.6821.7002.00
  1 49.0000.1921.6821.7002.00 0 msec ! 0 msec ! 0 msec !