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S12700 V200R011C10 Configuration Guide - VPN

This document describes the VPN configuration procedures and provides configuration examples.
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Configuring the GR of the Routing Protocol Between PEs and CEs

Configuring the GR of the Routing Protocol Between PEs and CEs

Context

When configuring GR of the routing protocol running between PEs and CEs, configure the corresponding GR (IS-IS GR, OSPFv3 GR, or BGP GR) according to the routing protocol running between the PEs and CEs.

Procedure

  • Configuring the GR of the IS-IS instance between PEs and CEs
    1. Run system-view

      The system view is displayed.

    2. Run isis process-id vpn-instance vpn-instance-name

      The IS-IS instance view is displayed.

    3. Run ipv6 enable

      The IPv6 capability is enabled for IS-IS.

    4. Run graceful-restart

      The GR capability is enabled for IS-IS.

      By default, the GR capability is disabled.

    5. (Optional) Run graceful-restart interval interval-value

      The interval for re-establishing the GR session of IS-IS is configured.

      The interval for re-establishing the GR session of IS-IS is set to the Hold time in the Hello PDU of IS-IS. In this way, the neighbor does not terminate the peer relationship with the device when the device performs the AMB/SMB switchover.

      By default, the interval for re-establishing the GR session of IS-IS is set to 300 seconds.

    6. (Optional) Run graceful-restart suppress-sa

      The GR Restarter is configured to suppress the advertisement of the peer relationship when the GR Restarter is restarting.

      The suppress advertisement (SA) bit is used in the Hello PDUs by a restarting device to request its neighbors to suppress advertising the adjacency to the restarting device. The SA bit is removed once its database synchronization is over. Enabling this feature avoids the black hole effect caused by sending and receiving LSP during the restart process.

      If the administrator does not want the restarting device to set the SA bit in its Hello PDUs, the administrator can use the undo graceful-restart suppress-sa command to disable setting the SA bit in the Hello PDUs.

      By default, the SA bit does not take effect.

  • Configuring the GR of the OSPFv3 instance between PEs and CEs
    1. Run system-view

      The system view is displayed.

    2. Run ospfv3 process-id vpn-instance vpn-instance-name

      The OSPFv3 instance view is displayed.

    3. Perform the following as required:

      • Run graceful-restart [ period period | ack-time time | retransmit-interval interval | lsa-checking-ignore | planned-only ]*

        The GR capability is enabled for OSPFv3.

      • Run helper-role [ { ip-prefix ip-prefix-name | acl-number acl-number | acl-name acl-name } | max-grace-period period | planned-only | lsa-checking-ignore ]*

        The GR Help capability is enabled for OSPFv3.

      It is suggested to enable the GR capability for OSPFv3 on all the PEs that use OSPFv3 to communicate with CEs.

      By default, the local link signaling capability, the out-of-band capability, the GR Help capability and the GR capability for OSPFv3 are all disabled.

  • Configuring BGP GR between PEs and CEs
    1. Run system-view

      The system view is displayed.

    2. Run bgp { as-number-plain | as-number-dot }

      The BGP view is displayed.

    3. Run graceful-restart

      The GR capability is enabled for BGP.

    4. (Optional) Run graceful-restart timer restart time

      The maximum time for restarting the GR Restarter is configured.

      The restart period is the maximum waiting period from the time when the receiving speaker detects that the GR Restarter restarts to the time when the BGP session is re-established. If no BGP session is re-established within the restart period, the receiving speaker deletes the BGP route in the stale state. By default, the restart period is set to 150 seconds.

      Modifying the restart period leads to the re-establishment of the BGP peer relationship.

    5. (Optional) Run graceful-restart timer wait-for-rib time

      The time of waiting for the End-of-RIB message is configured.

      By default, the time of waiting for the End-of-RIB message is 600 seconds.

      When the BGP session is set up or reestablished, the BGP restarter must receive the End-Of-RIB flag in the period set by using this command. If the BGP restarter does not receive the End-Of-RIB flag, ensure that the routers can exit from the GR process.

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Updated: 2019-04-01

Document ID: EDOC1000178118

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