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Configure IPv6 IS-IS Routing Control

Configuration Condition

Before configuring the IPV6 IS-IS routing feature, first complete the following tasks:

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

Configure IPV6 IS-IS Metric Style

Initially, the IS-IS only has the narrow metric style. When the narrow metric style is used, the maximum metric value is 63. With the expansion of the network scale, the metric style cannot satisfy the requirements. Therefore, the wide metric style emerges whose metric value can reach 16777214. Devices use different metric styles cannot advertise and learn the routing information from each other. To realize the transition between the two metric styles, the configuration method for the transition metric style is provided.

The wide metric style is recommended.

Table 10-8 Configure the IPV6 IS-IS metric style

Step

Command

Description

Enter the global configuration mode

configure terminal

-

Enter the IS-IS configuration mode

router isis [area-tag]

-

Configure the interface metric style

metric-style {narrow | narrow transition | transition | wide | wide transition} [level-1 | level-1-2 | level-2]

Optional

By default, the narrow metric style is used.

Configure IPV6 IS-IS Interface Metric Value

When the IS-IS protocol is enabled on the interface, the IS-IS routing metric is the global metric value. The following command can be used to specify a metric value for each interface.

Table 10-9 Configure the interface metric value

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 metric value

metric metric-value [ level-1 | level-2 ]

Optional

By default, the global metric value is 10.

Return to the global configuration mode

exit

-

Enter the interface configuration mode

interface interface-name

-

Configure the interface metric value

isis ipv6 metric {metric-value | maximum} [level-1 | level-2]

Optional

By default, the global metric value is used.

Configure IPV6 IS-IS Administrative Distance

The system chooses the primary routing based on the administrative distance. The smaller the administrative distance is, the higher priority the routing has.

Table 10-10 Configure the IPV6 IS-IS administrative distance

Step

Command

Description

Enter the global configuration mode

configure terminal

-

Enter the IPV6 IS-IS configuration mode

router isis [area-tag]

-

Enter the IS-IS IPv6 address family configuration mode

address-family ipv6 unicast

-

Configure the IS-IS routing administrative distance

distance distance-value

Optional

By default, the administrative distance is 115.

Configure IPV6 IS-IS Route Summary

The route summary summarizes multiple pieces of routing information as a piece of routing information. After the route summary is configured for the IS-IS, the number of advertisements to the subnet reduces effectively and the link status database and routing table size reduce. This effectively saves the memory and CPU resources. This configuration is generally applied to the Level-1-2 edge device, reducing the routing information of layer advertisement.

Table 10-11 Configure the IPV6 IS-IS route summary

Step

Command

Description

Enter the global configuration mode

configure terminal

-

Enter the IS-IS configuration mode

router isis [area-tag]

-

Enter the IPv6 address family configuration mode

address-family ipv6 unicast

-

Configure the IS-IS route summary

summary-prefix prefix-value [ metric metric-value / route-type {internal | external} / metric-type {internal | external} / tag tag-value / not-advertise / level-1 / level-2 / level-1-2 ]

Mandatory

By default, the route summary is not performed.

Configure the maximum number of load-balanced routes for the IPV6 IS-IS

There are multiple paths of the same cost to the same destination IP address. These ECMP (equal cost multipath routing) can improve the link utilization rate. The user can control the maximum number of the IS-IS ECMPs.

Table 10-12 Configure the maximum number of load-balanced routes for the IPV6 IS-IS

Step

Command

Description

Enter the global configuration mode

configure terminal

-

Enter the IS-IS configuration mode

router isis [ area-tag ]

-

Enter the IPv6 address family configuration mode

address-family ipv6 unicast

-

Configure the maximum number of load-balanced routes for the IS-IS

maximum-paths max-number

Optional

By default, the maximum number of paths for load balancing is 4.

Configure IPV6 IS-IS Inter-layer Route Leakage

By default, the IS-IS only leak the Level-1 routing to the Level-2, but the Level-1 area cannot know the routing of the Level-2 area. The inter-layer route leakage can be configured to introduce the Level-2 routing to the Level-1 area. When configuring the inter-layer route leakage, the routing policy can be specified to only leak the route that matches the condition.

Table 10-13 Configure the IPV6 IS-IS inter-layer route leakage

Step

Command

Description

Enter the global configuration mode

configure terminal

-

Enter the IS-IS configuration mode

router isis [ area-tag ]

-

Enter the IS-IS IPv6 address family configuration mode

address-family ipv6 unicast

-

Configure the route leakage between the IS-IS layer

propagate { level-1 into level-2 | level-2 into level-1 } [ distribute-list access-list-name | route-map route-map-name ]

Mandatory

By default, the Level-1 leaks its route to the Level-2.

Configure IPV6 IS-IS ATT-bit

In the Level-1-2 device, the ATT-bit is used to inform other nodes whether this node has the connection to other areas. If yes, the ATT-bit will be set to 1 automatically and other nodes will generate a default route to this node. This increases the service load of this node. To avoid this situation, the ATT-bit can be forcibly set to 0.

Table 10-14 Configure the IPV6 IS-IS ATT-bit

Step

Command

Description

Enter the global configuration mode

configure terminal

-

Enter the IS-IS configuration mode

router isis [ area-tag ]

-

Enter the IS-IS IPv6 address family configuration mode

address-family ipv6 unicast

-

Configure the IS-IS ATT-bit

set-attached-bit { on | off }

Mandatory

By default, the ATT-bit is set based on whether the node is connected to other areas.