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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R011C10

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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Controlling Whether a Level-1 Device Generates an IPv6 Default Route

Controlling Whether a Level-1 Device Generates an IPv6 Default Route

Context

As defined in the IS-IS protocol, if a Level-1-2 device reaches more areas through a Level-2 area than through a Level-1 area based on the link state database (LSDB), the Level-1-2 device sets the ATT bit to 1 in the LSPs and sends the LSPs with the ATT bit 1 to the Level-1 device. Upon receipt, the Level-1 device generates a default route destined for the Level-1-2 device.

The preceding rules are used by default. You can set the ATT bit as required on a live network.

Perform the following steps:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run isis [ process-id ]

    The IS-IS view is displayed.

  3. Run the following command as required:

    • To set the ATT bit in the LSPs sent by the Level-1-2 device, run the attached-bit advertise { always | never } command.

      • If the always parameter is specified, the ATT bit is set to 1. After receiving the LSPs carrying the ATT bit 1, the Level-1 device generates a default route.
      • If the never parameter is specified, the ATT bit is set to 0. After receiving the LSPs carrying the ATT bit 0, the Level-1 device does not generate a default route, which reduces the size of a routing table.
    • To disable the Level-1 device from generating default routes even though it receives the LSPs carrying the ATT bit 1, run the attached-bit avoid-learning command.

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Updated: 2019-04-01

Document ID: EDOC1000178324

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