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Configuration Guide - IP Unicast Routing

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring the Cost of an IS-IS Interface

Configuring the Cost of an IS-IS Interface

Context

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

  • Global cost: is configured for all interfaces.

  • Automatically calculated cost: is 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 want to change the cost style of IS-IS devices, running the command while configuring basic IS-IS functions is recommended. If the cost style of IS-IS devices is changed during network operation, the IS-IS process is restarted and the neighbor relationship is re-established.

Procedure

  1. Configure the 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 ] }

      The IS-IS cost style is configured.

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

    4. Run commit

      The configuration is committed.

    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 the cost of an IS-IS interface.

    Perform any of the following operations to configure the cost of an IS-IS interface.

    Configure the cost of a specified IS-IS interface.

    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. 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.

      The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.

      NOTE:

      If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

    4. Run isis cost cost [ level-1 | level-2 ]

      The cost of the IS-IS interface is configured.

      By default, the link cost of an IS-IS interface is 10.

      NOTE:

      To change the cost of a loopback interface, run the isis cost command only in the interface view.

    5. Run commit

      The configuration is committed.

    Configure the global IS-IS cost.

    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS view is displayed.

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

      The global IS-IS cost is configured.

      By default, no global cost is configured.

    4. Run commit

      The configuration is committed.

    Enable IS-IS to automatically calculate the interface cost.

    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS view is displayed.

    3. Run bandwidth-reference value

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

    4. Run auto-cost enable

      The interface is configured to automatically calculate its cost.

    5. Run commit

      The configuration is committed.

    The bandwidth reference value set using the 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 7-9.

    Table 7-9 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: 2019-04-20

Document ID: EDOC1100074760

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