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Configuration Guide - Interface Management

CloudEngine 12800 and 12800E V200R003C00

This document describes the interface management configuration, including basic interface configuration, Ethernet interface configuration, and logical interface configuration.

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Configuring the Delay Before the Protocol Status of an Interface Can Go Up

Configuring the Delay Before the Protocol Status of an Interface Can Go Up


On a network with primary and backup links, when the primary link becomes faulty, service traffic is switched from the primary link to the backup link. After the primary link is restored, service traffic is switched back to the primary link. When the interface protocol status of the primary link is Up, Layer 3 protocols such as routing and VRRP protocols are used to send protocol packets and re-negotiate with the peer end. If the link status of the local or peer interface does not meet the forwarding requirement, the protocol packets are discarded. This makes the Layer 3 protocol negotiation mechanism ineffective and results in extra device costs.

For example, the local end uses a 10GE interface for the primary link and the interface protocol status is Up; the peer end uses a VLANIF interface and the interface protocol status is Up. However, the member physical interface of the VLANIF interface is still in STP blocking status of the link layer. When the routing protocol packet sent by the local 10GE interface reaches the peer end, the peer end cannot respond to the packet because the peer physical interface is in STP blocking status. You can run the protocol up-delay-time command to configure the delay before the protocol status of an interface can go Up. This enables the protocol status of the interface to go Up after its link status is recovered, which prevents the protocol packets from being discarded.


  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.


    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 protocol up-delay-time time-value

    The delay before the protocol status of the interface can go Up is configured.

    By default, the physical interface delay is 0s, the VLANIF interface delay is 1s.

  5. Run commit

    The configuration is committed.

Updated: 2019-05-05

Document ID: EDOC1100004195

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