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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R010C00

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.

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(Optional) Configuring a Cost for the Default Route Sent to a Stub Area

(Optional) Configuring a Cost for the Default Route Sent to a Stub Area

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 area is configured as a stub area.

    The parameter no-summary prevents an ABR from sending Type 3 LSAs to the stub area.

    The parameter default-route-advertise enables an ABR to generate default Type 3 LSAs and advertise them to the stub area.

    The parameter backbone-peer-ignore prevents an 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 if an Up interface exists in the backbone area.

    NOTE:
    • Stub attributes must be configured on all switches 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. Run:

    default-cost cost

    The cost of the default Type 3 route to the stub area is set.

    The default value is 1.

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

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Updated: 2019-12-27

Document ID: EDOC1000141900

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