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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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Configuring Local MT

Configuring Local MT

Applicable Environment

When multicast and an MPLS TE tunnel are configured and the TE tunnel is configured with IGP Shortcut, the outbound interface of the route calculated by an IGP is not a physical interface but a TE tunnel interface. The switch uses the TE tunnel interface to send multicast Join messages through a unicast route to the multicast source address. The switch through which the TE tunnel passes, however, cannot detect the multicast Join messages. As a result, multicast forwarding entries will not be created.

To resolve this problem, enable local MT. After local MT is enabled, if the outbound interface of the calculated route is a TE tunnel interface of the IGP Shortcut type, the route management (RM) module creates a separate MIGP routing table for the multicast protocol, calculates the physical outbound interface for the route, and adds the physical interface to the MIGP routing table for multicast forwarding.

Configuring filtering conditions for local MT controls the number of routing entries in an MIGP routing table and speeds up MIGP routing table lookup.

Pre-configuration Tasks

Before configuring local MT, complete the following tasks:

  • Configure IP addresses for interfaces to ensure that neighboring switches are reachable at the network layer.

  • Configuring Basic OSPF Functions

  • Configuring a TE tunnel for the OSPF process

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF process view is displayed.

  3. Run local-mt enable

    Local MT is enabled.

    NOTE:
    • Local MT is applicable only to the OSPF process of a public network instance.
    • Local MT does not support Forwarding Adjacency (FA).

  4. (Optional) Run local-mt filter-policy { acl { acl-number | acl-name } | ip-prefix ip-prefix-name | route-policy route-policy-name }

    Configure a filtering policy for Local MT.

    After an MIGP routing table is created, OSPF calculates routes. When an IGP Shortcut-capable TE tunnel interface is calculated as the outbound interface, the switch saves the physical interface on which the tunnel interface is configured as the outbound interface in the MIGP routing table for multicast packet forwarding.

    To control the number of entries in the MIGP routing table and speed up the MIGP routing table search, configure filtering conditions to allow only the matching routes to the multicast source address to be added to the MIGP routing table.

    Multiple routes to a non-multicast source address may be added to a MIGP routing table, causing the number of entries to exceed the upper limit. Therefore, configuring a routing policy before enabling local MT is recommended.

    NOTE:
    When the rule command is used to configure the filtering condition for a named ACL using the acl command, only the source address range specified by the parameter source and the time range specified by the parameter time-range in the rule command take effect.

Verifying the Configuration

  • Run the display ospf [ process-id ] migp-routing [ ip-address [ mask | mask-length ] ] [ interface interface-type interface-number ] [ nexthop nexthop-address ] command to check the MIGP routing table information.
  • Run the display ospf [ process-id ] routing command to check OSPF routing table information.
  • Run the display ospf [ process-id ] brief command to check brief OSPF information.
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Updated: 2019-04-01

Document ID: EDOC1000178324

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