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NE40E V800R010C00 Configuration Guide - MPLS 01

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(Optional) Configuring Timers for a Local LDP Session

(Optional) Configuring Timers for a Local LDP Session

Timers of a local LDP session include the link Hello hold timer, link Hello send timer, Keepalive hold timer, Keepalive send timer, and Exponential backoff timer.

Context

The following timers are used in a local LDP session:
Table 4-1  Timers for a local LDP session

LDP Timers

Description

Suggestion

Link Hello send timer

Used to send Hello messages periodically to notify a peer LSR of the local LSR's presence and establish a Hello adjacency. Similar to a remote LDP session, a local LDP session uses a link Hello send timer.

On an unstable network, decrease the value of a link Hello send timer, speeding up network fault detection.

Link Hello hold timer

Used to exchange Hello messages periodically between two LDP peers to maintain the Hello adjacency. If no Hello message is received after the link Hello hold timer expires, the Hello adjacency is torn down. Similar to a remote LDP session, a local LDP session uses a link Hello hold timer.

On a network with unstable links or a large number of packets, increase the value of the link Hello hold timer, preventing a local LDP session from being torn down and set up frequently.

KeepAlive send timer

Used to send KeepAlive messages periodically, maintaining the local LDP session.

On an unstable network, set a smaller value for a KeepAlive send timer, speeding up network fault detection.

KeepAlive hold timer

Used to send LDP PDUs over an LDP session, maintaining the local LDP session. If no LDP PDU is received after the KeepAlive hold timer expires, the TCP connection is closed and the local LDP session is terminated.

On a network with unstable links, increase the value of the KeepAlive hold timer, preventing the local LDP session from flapping.

Exponential backoff timer

Started by an LSR that plays an active role after an LDP Initialization message sent by the LSR to another LSR that plays a passive role fails to be processed or parameters carried in the message are rejected. The LSP that plays the active role periodically resends an LDP Initialization message to initiate an LDP session before the Exponential backoff timer expires.

  • When a device is upgraded, prolong the period for the active role to retry setting up a session. In this case, you can set larger initial and maximum values for the Exponential backoff timer.

  • When a device that bears services tends to alternate between Up and Down, shorten the period for the active role to retry setting up a session. In this case, you can set smaller initial and maximum values for the Exponential backoff timer.

The default timer values are recommended.

Procedure

  • Configure a link Hello send timer.
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The view of the interface on which an LDP session is to be established is displayed.

    3. Run:

      mpls ldp timer hello-send interval

      A link Hello send timer is configured.

      Effective link Hello send timer value = Min{Configured link Hello send timer value, 1/3 of the link Hello hold timer value}

    4. Run:

      commit

      The configurations are committed.

  • Configure a link Hello hold timer.
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The view of the interface on which an LDP session is to be established is displayed.

    3. Run:

      mpls ldp timer hello-hold interval

      A link Hello hold timer is configured.

      If a link Hello hold timer is configured on each end of a local LDP session, the smaller value takes effect.

      NOTE:

      The timer must be longer than the time a device takes to perform a master/slave main control board switchover. If the timer is set to less than the switchover time, a protocol intermittent interruption occurs during a switchover. The default timer value is recommended.

    4. Run:

      commit

      The configurations are committed.

  • Configure a Keepalive send timer for a local LDP session.
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The view of the interface on which an LDP session is to be established is displayed.

    3. Run:

      mpls ldp timer keepalive-send interval

      A Keepalive send timer is configured for the local LDP session.

      Effective Keepalive send timer value = Min{Configured Keepalive send timer value, 1/3 of the Keepalive hold timer value}

    4. Run:

      commit

      The configurations are committed.

  • Configure a Keepalive hold timer for a local LDP session.
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The view of the interface on which an LDP session is to be established is displayed.

    3. Run:

      mpls ldp timer keepalive-hold interval

      A Keepalive hold timer is configured for the local LDP session.

      If a Keepalive hold timer is configured on each end of a local LDP session, the smaller value takes effect.

      NOTE:

      The timer must be longer than the time a device takes to perform a master/slave main control board switchover. If the timer is set to less than the switchover time, a protocol intermittent interruption occurs during a switchover. The default timer value is recommended.

    4. Run:

      commit

      The configurations are committed.

  • Configure an Exponential backoff timer.
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      mpls

      The MPLS view is displayed.

    3. Run:

      mpls ldp

      The MPLS-LDP view is displayed.

    4. Run:

      backoff timer init max

      An Exponential backoff timer is configured.

    5. Run:

      commit

      The configurations are committed.

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Updated: 2018-07-12

Document ID: EDOC1100028530

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