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Configuration Guide - IP Unicast Routing

S7700 and S9700 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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Configuring a Cost for IS-IS Interfaces on an IPv6 Network

Configuring a Cost for IS-IS Interfaces on an IPv6 Network

Context

The costs of IS-IS interfaces can be determined in the following modes (in descending order of priority):
  • Interface cost: configured for a specified interface.

  • Global cost: configured for all interfaces.

  • Automatically calculated cost: automatically calculated based on the interface bandwidth.

If no cost is configured for an IS-IS interface, the IS-IS interface uses the default cost 10 and cost style narrow.

If you need to change the cost style of IS-IS devices, change it during the configuration of basic IS-IS functions is recommended. If the cost style of IS-IS devices is changed during network operation, the IS-IS process will be restarted, and the neighbor relationship will be re-established.

Procedure

  1. Configure an IS-IS cost style.
    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS view is displayed.

    3. Run cost-style { narrow | wide | wide-compatible | { narrow-compatible | compatible } [ relax-spf-limit ] }

      An IS-IS cost style is configured.

      By default, the cost style of routes received and sent by an IS-IS device is narrow.

    The cost range of an interface and a route received by the interface vary with the cost type.

    • If the cost style is narrow, the cost of an interface ranges from 1 to 63. The maximum cost of a route received by the interface is 1023.

    • If the cost style is narrow-compatible or compatible, the cost of an interface ranges from 1 to 63. The cost of a received route is related to relax-spf-limit.

    • If the cost style is wide-compatible or wide, the cost of the interface ranges from 1 to 16777215. When the cost is 16777215, the neighbor TLV generated on the link cannot be used for route calculation but for the transmission of TE information. The maximum cost of a received route is 0xFFFFFFFF.

  2. Configure a cost for an IS-IS interface on an IPv6 network.

    Perform any of the following operations as required:

    Configure a cost for a specified IS-IS interface on an IPv6 network.

    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. (Optional) On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

    4. Run isis ipv6 cost { cost | maximum } [ level-1 | level-2 ]

      A cost is configured for the IS-IS interface on an IPv6 network.

      By default, the cost of an IS-IS interface on an IPv6 network is 10.

      NOTE:

      You can configure the parameter maximum only when the IS-IS cost style is wide or wide-compatible.

    Configure a global IS-IS interface cost on an IPv6 network.

    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS view is displayed.

    3. Run ipv6 circuit-cost { cost | maximum } [ level-1 | level-2 ]

      A global IS-IS interface cost on an IPv6 network is configured.

      By default, no global cost is configured.

    Enable IS-IS interfaces to automatically calculate their costs on an IPv6 network.

    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS view is displayed.

    3. Run ipv6 bandwidth-reference value

      A bandwidth reference value is configured. By default, the value is 100 Mbit/s.

    4. Run ipv6 auto-cost enable [ compatible ]

      IS-IS interfaces are configured to automatically calculate their costs on an IPv6 network.

    The bandwidth reference value set using the ipv6 bandwidth-reference command takes effect only when the cost style is wide or wide-compatible. In this case, the interface cost is calculated using the following formula:

    Cost of each interface = (Bandwidth-reference/Interface bandwidth) × 10

    If the cost-style is narrow, narrow-compatible, or compatible, the cost of each interface is based on costs listed in Table 8-4.

    Table 8-4  Mapping between IS-IS interface costs and interface bandwidth

    Cost

    Bandwidth Range

    60

    Interface bandwidth ≤ 10 Mbit/s

    50

    10 Mbit/s < interface bandwidth ≤ 100 Mbit/s

    40

    100 Mbit/s < interface bandwidth ≤ 155 Mbit/s

    30

    155 Mbit/s < interface bandwidth ≤ 622 Mbit/s

    20

    622 Mbit/s < Interface bandwidth ≤ 2.5 Gbit/s

    10

    2.5 Gbit/s < Interface bandwidth

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Updated: 2019-04-01

Document ID: EDOC1000178324

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