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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R013C00

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, IP Routing Table Management, and PBR.
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Configuring Local MT

Configuring Local MT

Applicable Environment

When both 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 may 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, you need to 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.

You can configure filtering conditions for local MT to control the number of routing entries in an MIGP routing table and speed 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.

  • Configure basic OSPF functions.

  • Configure 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 }

    A filtering policy is configured for local MT.

    After an MIGP routing table is created, OSPF calculates routes. When the calculation result shows that the outbound interface is an IGP Shortcut-capable TE tunnel interface, the switch saves the physical interface where the tunnel interface resides 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 lookup, you can configure a filtering policy to allow only the matched 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, you are advised to configure a routing policy before enabling local MT.

    NOTE:
    If a named ACL is configured using the acl command and a rule is configured using the rule command for the ACL, the rule takes effect only on the source address range specified by the parameter source within the time range specified by the parameter time-range.

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: 2019-04-08

Document ID: EDOC1100065744

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