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NE40E V800R010C10SPC500 Configuration Guide - User Access 01

This is NE40E V800R010C10SPC500 Configuration Guide - User Access
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Controlling Advertisement of Address Pool UNRs

Controlling Advertisement of Address Pool UNRs

If BRASs work in load balancing mode, the BRASs must be configured to control advertisement of UNRs of configured address pools.

Context

In the dual-system hot backup scenario, BRASs control the advertisement of UNRs of configured address pools in either of the following modes:
  • Manual control: If two BRASs work in load balancing mode, each BRAS is configured with two address pools. One is the primary address pool and the other is the secondary address pool. The primary address pool on one BRAS is the secondary address pool on the other BRAS. The cost value of the primary address pool must be smaller than that of the secondary address pool on the same BRAS, allowing the primary address pool to be preferentially used. The cost values can be set in a routing policy, which allows the UNR of the primary address pool to have higher route precedence than that of the secondary address pool. For information about how to configure a routing policy, see Configuring a Routing Policy in HUAWEI NetEngine40E Universal Service Router Configuration Guide - IP Routing.
  • Automatic route advertisement is easier to configure than manual route advertisement. Automatic route advertisement prevents the problem that if a fault in a BRAS occurs and a master/backup BRAS switchover is implemented, UNRs cannot be automatically advertised after the BRAS recovers. The default route cost can be used to control route preference. If dual-system hot backup is configured on BRASs, a routing protocol imports UNRs and trusts UNR preference values. This allows the network segment route of the primary address pool to have higher route precedence than that of the secondary address pool.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run peer-backup route-cost auto-advertising

    The BRAS is configured to use default cost values of routes to control route preference when the routes are generated. The route can be an address pool UNR or a route to a loopback interface of the LAC on an L2TP tunnel.

    NOTE:
    The address pool routes are not updated in real time whether or not the BRAS is configured to use default cost values of routes to control route preference. The route control takes effect only when the address pool is re-bound to the PBS.

  3. Run commit

    The configuration is committed.

Follow-up Procedure

To use a routing policy to allow the UNR of the primary address pool to be the highest, run the import-route unr route-policy route-policy-name command in the IS-IS, OSPF, or BGP view:

  • In the IS-IS view:

    Run the import-route unr route-policy route-policy-name command.

  • In the OSPF view:

    Run the import-route unr route-policy route-policy-name command.

  • In the BGP view:

    Run the import-route unr route-policy route-policy-name command.

To persevere cost values of UNRs imported by a routing protocol, perform one of the following steps based on the type of routing protocol:
  • In the IS-IS view:

    Run the import-route unr inherit-cost command.

  • In the OSPF view, run the following commands:
    1. default cost inherit-metric
    2. import-route unr
  • In the BGP view:

    Run the import-route unr command.

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Updated: 2019-01-03

Document ID: EDOC1100055031

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