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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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Setting the Link Cost for an OSPF Interface

Setting the Link Cost for an OSPF Interface

Context

You can set the link cost using the ospf cost cost command. If you do not set the link cost of an OSPF interface using the command, OSPF can automatically calculate the link cost for the interface based on the interface bandwidth.

The calculation formula is as follows:

Link cost of an interface = Bandwidth reference value/Interface bandwidth

The integer part of the calculation result is used as the link cost of the interface. If the calculated result is less than 1, the cost value is 1. Changing the bandwidth reference value can change the link cost of an interface.

Procedure

  • Setting the link cost for an OSPF interface
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The OSPF 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 ospf cost cost

      The link cost of the OSPF interface is set.

    5. Run commit

      The configuration is committed.

  • Changing the bandwidth reference value
    1. Run system-view

      The system view is displayed.

    2. Run ospf [ process-id ]

      The OSPF process view is displayed.

    3. Run bandwidth-reference value

      The bandwidth reference value is changed.

      The parameter value specifies the bandwidth reference value used to calculate the link cost, in Mbit/s.

    4. Run commit

      The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100074760

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