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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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Configuring OSPFv3 GTSM

Configuring OSPFv3 GTSM


GTSM only checks the TTL values of packets that match a GTSM policy. You can configure a switch to allow mismatched packets to pass through the filter or be discarded. If you configure the switch to discard mismatched packets, enable GTSM on the switches with which the switch may communicate. Otherwise, connections cannot be established, because the switch discards all packets from non-GTSM switches.

In addition, you can configure the switch to log discarded packets. This facilitates future fault locating.


  1. Run:


    The system view is displayed.

  2. Run:

    ospfv3 valid-ttl-hops valid-ttl-hops-value [ vpn-instance vpn-instance-name ]

    OSPFv3 GTSM is configured.

    GTSM must be enabled at both ends of an OSPFv3 connection.

    The ospfv3 valid-ttl-hops command both enables OSPFv3 GTSM and sets a TTL value. If you specify the vpn-instance parameter, the switch sets only the TTL values of packets in this VPN but does not enable OSPFv3. Therefore, if you want to apply the configured TTL value only to packets in a VPN instance or a public network instance, set the default action to pass for packets that does not match the GTSM policy. This prevents OSPFv3 packets in other instances from being discarded.

    The range of valid TTL value is from (255 – valid-ttl-hops-value + 1) to 255.

  3. (Optional) Run:

    gtsm default-action { drop | pass }

    An action is configured for the switch to perform on the packets that do not match the GTSM policy.

    By default, pass is executed on these packets.


    If an action is configured but a GTSM policy is not, GTSM does not take effect.

  4. (Optional) Run:

    gtsm log drop-packet all

    The switch is configured to log the packets discarded on the switch.

Updated: 2019-08-21

Document ID: EDOC1000141900

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