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Configuration Guide - IP Unicast Routing

S9300, S9300E, and S9300X V200R011C10

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.
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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 7-3 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 7-3  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 in wide mode respectively.

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: 2019-10-22

Document ID: EDOC1000178418

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