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Configure IPV6 IS-IS Layer Attribute

Configuration Condition

Before configuring the IPV6 IS-IS layer attribute, first complete the following tasks:

  • Configure the IPv6 address of the interface to enable the neighboring nodes to be reachable at the network layer.
  • Enable the IPV6 IS-IS protocol.

Configure IS-IS Layer Attribute

The IS-IS layer attribute is divided into the global layer attribute and the interface layer attribute. The global layer attribute is the IS-IS intermediate system, which is further classified into the following three types:

  • Level-1 intermediate system: Only the link status database of Level-1 is available and only the routing in the Level-1 area can be advertised and learnt.
  • Level-2 intermediate system: Only the link status database of Level-2 is available and only the routing in the Level-2 area can be advertised and learnt.
  • Level-1-2 intermediate system: Both the link status database of Level-1 and Level-2 are available and both the routing in the Level-1 and Level-2 area can be advertised and learnt. The Level-1-2 intermediate system is the interconnection device in the Level-1 and Level-2 area.

The layer attribute of the IS-IS interface is classified into the following three types:

  • Level-1 attribute interface: Only the Level-1 packet of the IS-IS protocol can be transmitted and received and only the neighbor of Level-1 can be established.
  • Level-2 attribute interface: Only the Level-2 packet of the IS-IS protocol can be transmitted and received and only the neighbor of Level-2 can be established.
  • Level-1-2 attribute interface: Both the Level-1 packet and Level-2 packet of the IS-IS protocol can be transmitted and received and both the neighbors of Level-1 and Level-2 can be established.

The IS-IS interface layer attribute depends on the IS-IS global layer attribute. The Level-1 intermediate system only has the interface of Level-1 attribute, the Level-2 intermediate system only has the interface of Level-2 attribute, and the Level-1-2 intermediate system can has interfaces of all attributes.

Table 10-4 Configure the IPV6 IS-IS global layer attribute

Step

Command

Description

Enter the  global configuration mode

configure terminal

-

Enter the IS-IS configuration mode

router isis [area-tag]

-

Configure the IS-IS global layer attribute

is-type { level-1 | level-1-2 | level-2-only }

Optional

By default, the IS-IS global layer attribute is Level-1-2.

Table 10-5 Configure the IS-IS interface layer attribute

Step

Command

Description

Enter the global configuration mode

configure terminal

-

Enter the interface configuration mode

interface interface-name

-

Configure the interface layer attribute

isis circuit-type [ level-1 | level-1-2 | level-2-only ]

Optional

By default, the interface layer attribute is consistent with the global layer attribute when the interface layer attribute is not specified.