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Configuration Guide - IP Unicast Routing

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.
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Configuring IPv6 IS-IS Route Leaking

Configuring IPv6 IS-IS Route Leaking

Context

If multiple Level-1-2 devices in a Level-1 area are connected to devices in the Level-2 area, a Level-1 LSP sent by each Level-1-2 device carries an ATT flag bit of 1. This Level-1 area will have multiple routes to the Level-2 area and to other Level-1 areas.

By default, routes in a Level-1 area can be leaked into the Level-2 area so that Level-1-2 and Level-2 devices can learn about the topology of the entire network. Devices in a Level-1 area are unaware of the entire network topology because they only maintain LSDBs in the local Level-1 area. Therefore, a device in a Level-1 area can forward traffic to a Level-2 device only through the nearest Level-1-2 device. The route used may not be the optimal route to the destination.

To enable a device in a Level-1 area to select the optimal route, configure IPv6 IS-IS route leaking so that specified routes in the Level-2 area can be leaked into the local Level-1 area.

Routes of services deployed only in the local Level-1 area do not need to be leaked into the Level-2 area. A policy can be configured to leak only desired routes into the Level-2 area.

Procedure

  • Specify IPv6 IS-IS routes in the Level-2 area and other Level-1 areas that can be leaked into the local Level-1 area.
    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS view is displayed.

    3. Run ipv6 import-route isis level-2 into level-1 [ tag tag | filter-policy { acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } | direct { allow-filter-policy | allow-up-down-bit } * ] *

      IPv6 IS-IS routes in the Level-2 area and other Level-1 areas that meet the specified conditions are leaked into the local Level-1 area.

      By default, IPv6 IS-IS routes in the Level-2 area are not leaked into Level-1 areas.

      NOTE:

      The command is run on the Level-1-2 device that is connected to an external area.

    4. Run commit

      The configuration is committed.

  • Configure IPv6 IS-IS routes in Level-1 areas to leak into the Level-2 area.
    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS view is displayed.

    3. Run ipv6 import-route isis level-1 into level-2 [ tag tag | filter-policy { acl6-number | acl6-name acl6-name | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } | direct allow-filter-policy ] *

      IPv6 IS-IS routes that meet the specified conditions in Level-1 areas are leaked into the Level-2 area.

      By default, all Level-1 IPv6 IS-IS routing information, excluding information about default routes, is leaked to Level-2 areas.

      NOTE:

      The command is run on the Level-1-2 device that is connected to an external area.

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Updated: 2019-04-20

Document ID: EDOC1100074760

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