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NE40E V800R010C10SPC500 Configuration Guide - User Access 01

This is NE40E V800R010C10SPC500 Configuration Guide - User Access
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Configuring an Address Pool on a Device Configured with a Shared Address Pool

Configuring an Address Pool on a Device Configured with a Shared Address Pool

In BRAS multi-device backup scenarios, properly configuring an address pool allows efficient use of addresses.

Context

The master and backup devices are configured with address pools in shared mode. If a link fault triggers a master/backup device switchover, the backup device (now the master device) can continue to assign addresses of the original master device (now the backup device) to users by using a remote DHCP server. This prevents address pool resource wastes.

Procedure

  1. Configure address pools on the master and backup devices.
    1. Run system-view

      The system view is displayed.

    2. Run either of the following commands:

      • To configure an IPv4 address pool and enter the address pool view, run the ip pool pool-name [ bas { local | remote } rui-slave ] command.
      • To configure an IPv6 address pool and the address pool view, run the ipv6 pool pool-name [ bas { local | remote } [rui-slave ] command.

      A local primary address pool and an rui-slave (local rui-slave) secondary address pool are configured on the master or backup device.

      NOTE:
      A remote DHCP server can be used to allocate addresses for users logging in to the master and backup devices. If a remote DHCP server is used, a remote address pool must be configured on the master device; a remote rui-slave address pool must be configured on the backup device; the address pools must be associated with the DHCP server group on the remote DHCP server.

    3. Run gateway ip-address mask

      The gateway address of the address pool is set.

      The gateway IP address and subnet mask are used to check whether an address segment is in the same subnet as the gateway. Therefore, the gateway IP address and subnet mask must be configured before the address segment.

    4. Run section section-num start-ip-address [ end-ip-address ]

      The address range is configured for the address pool.

      If both the master and backup devices have two address pools configured, the primary and secondary address pools must use different address ranges on the master and backup devices. The master device's primary address pool and the backup device's secondary address pool share an address range. The master device's secondary address pool and the backup device's primary address pool share an address range. This prevents address conflict after a master/backup device switchover occurs.

      NOTE:

      If an rui-slave address pool (configured using the local rui-slave parameter) is used, the remote DHCP server and its parameters must be configured.

      If an rui-slave address pool (configured using the local rui-slave parameter) is bound to an RBS, the address pool automatically uses the peer IP address in the RBS as a DHCP server IP address, without additional configuration.

      Before performing the following step, ensure that the dhcp-server group group-name remote-backup-service rbs-name command is run in the system view to specify the name of a DHCP server group and associate the DHCP server group with a specified RBS.

    5. (Optional) Run dhcp-server group group-name

      A remote DHCP server is configured.

      The remote DHCP server that is configured for the secondary address pool on the backup device must be mapped to the master device. On a network where the master and backup devices balance traffic, the remote DHCP server that is configured for the secondary address pool on the master device must also be mapped to the backup device.

    6. Run commit

      The configuration is committed.

  2. (Optional) Configure IP address pool mapping in the RBP.
    1. Run system-view

      The system view is displayed.

    2. Run remote-backup-profile profile-name

      The RBP view is displayed.

    3. Run ip-pool src-name include tag-name [ node node-id ]

      IP address pool mapping in the RBP is configured.

      A source address pool can be mapped to multiple target address pools in ascending order by node-id, which means that the mapping starts from the target address pool with the smallest node-id.

      This example assumes that a remote DHCP server is used to allocate addresses and if its address resources are exhausted, the local address pool is used to allocate addresses. This requires the secondary address pool on the backup device to have a higher priority than the primary address pool. Assume that the local address pool is used to allocate addresses, and if its address resources are exhausted, the remote DHCP server is used to allocate addresses. This requires the primary address pool to have a higher priority than the secondary address pool.

    4. (Optional) Run frame-route metric metric-num

      The preference of a route used by the RADIUS server to deliver an IP address is configured.

      NOTE:
      Only PPP leased line users are supported.

    5. Run commit

      The configuration is committed.

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Updated: 2019-01-03

Document ID: EDOC1100055031

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