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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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(Optional) Configuring Metrics of Default Routes Sent to Stub Areas

(Optional) Configuring Metrics of Default Routes Sent to Stub Areas

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF process view is displayed.

  3. Run area area-id

    The OSPF area view is displayed.

  4. Run stub [ no-summary | default-route-advertise backbone-peer-ignore ] *

    The specified area is configured as a stub area.

    • The parameter no-summary is used to forbid the ABR to send Type 3 LSAs to the stub area.
    • The parameter default-route-advertise is used to enable the ABR to generate default Type 3 LSAs and advertise them to the stub area.

    • The parameter backbone-peer-ignore is used to prevent the ABR from checking the neighbor status when the ABR generates default Type 3 LSAs and advertises them to the stub area. Specifically, the ABR generates default Type 3 LSAs and advertises them to the stub area as long as an interface that is Up exist in the backbone area.

    NOTE:
    • Stub attributes must be configured on all routers in a stub area using the stub command.
    • Configuring or deleting stub attributes will update routing information in the area. Stub attributes can be deleted or reconfigured only after the routing update is complete.

  5. (Optional) Run stub [ no-summary ]

    The specified area is configured as a stub area.

    The parameter no-summary is used to forbid the ABR to send Type 3 LSAs to the stub area.

    NOTE:
    • Stub attributes must be configured on all routers in a stub area using the stub command.
    • Configuring or deleting stub attributes will update routing information in the area. Stub attributes can be deleted or reconfigured only after the routing update is complete.

  6. Run default-cost cost

    The cost of the default route to the stub area is set.

    The parameter cost specifies the cost of the Type 3 default route to a stub area. The default value is 1.

    To ensure the reachability of AS external routes, the ABR in the stub area generates a default route and advertises the route to the non-ABR routers in the stub area.

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Updated: 2019-05-17

Document ID: EDOC1000174069

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