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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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IS-IS Wide Metric

IS-IS Wide Metric

In ISO 10589, the maximum IS-IS interface metric value can only be 63 and the IS-IS cost style is narrow. A small range of metrics cannot meet the requirements on large-scale networks. Therefore, in RFC 3784, the maximum IS-IS interface metric value can reach 16777215, and the maximum IS-IS route metric value can reach 4261412864; in this case, the IS-IS cost style is wide.
  • The following lists the TLVs used in narrow mode:

    • TLV 128 (IP Internal Reachability TLV): carries IS-IS routes in a routing domain.

    • TLV 130 (IP External Reachability TLV): carries IS-IS routes outside a routing domain.

    • TLV 2 (IS Neighbors TLV): carries neighbor information.

  • The following lists the TLVs used in wide mode:

    • TLV 135 (Extended IP Reachability TLV): replaces the earlier IP reachability TLV and carries IS-IS routing information. This TLV expands the route metric and carries sub-TLVs.

    • TLV 22 (IS Extended Neighbors TLV): carries neighbor information.

Table 7-2 lists the cost styles of received and sent IS-IS routing information. The cost styles of received and sent IS-IS routing information vary according to the cost style configured on a device.

Table 7-2 Cost styles of received and sent IS-IS routing information

Cost Style Configured on a Device

Cost Style for Received IS-IS Routing Information

Cost Style for Sent IS-IS Routing Information

narrow

narrow

narrow

narrow-compatible

narrow&wide

narrow

compatible

narrow&wide

narrow&wide

wide-compatible

narrow&wide

wide

wide

wide

wide

NOTE:

When the cost-style is set to compatible, IS-IS sends the information in narrow mode and then in wide mode.

IS-IS in wide mode and IS-IS in narrow mode cannot communicate. If IS-IS in wide mode and IS-IS in narrow mode need to communicate, you must change the mode to enable all routers on the network to receive packets sent by other routers.

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Updated: 2019-05-17

Document ID: EDOC1000174069

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