Disabling IPv6 protocol-support consistency checks

By default, IS-IS performs consistency checks on hello packets. If a hello packet does not have the same configured network protocols, IS-IS rejects the packet. The following task disables the IS-IS IPv6 protocol-support consistency checks so that two devices running different sets of network protocols can form an adjacency.

Procedure

Enter the configure terminal command to access global configuration mode.
```
device# configure terminal
```
Enter the router isis command to enter IS-IS router configuration mode and enable IS-IS on the device.
```
device(config)# router isis
```
Enter the address-family ipv6 unicast command to enable ISIS address-family IPv6 unicast configuration mode.
```
device(config-isis-router)# address-family ipv6 unicast
```
Enter the disable-adjacency-check command to disable IS-IS IPv6 protocol-support consistency checks.
```
device(config-router-isis-ipv6u)# disable-adjacency-check
```

Example

The following example disables IS-IS IPv6 protocol-support consistency checks..

device# configure terminal
device(config)# router isis
device(config-isis-router)# address-family ipv6 unicast
device(config-router-isis-ipv6u)# disable-adjacency-check