Configuring OSPFv3 GTSM
To apply OSPFv3 GTSM functions, enable GTSM on the two ends of the OSPFv3 connection.
Pre-configuration Tasks
Before configuring the OSPFv3 GTSM, complete the following task:
Configuring basic OSPFv3 functions
Procedure
- Configure basic OSPFv3 GTSM functions.
To apply the GTSM, you need to enable GTSM on both ends of the OSPFv3 connection.
- Run ospfv3 valid-ttl-hops [ hops ] [ vpn-instance vpn-instance-name ]
The OSPFv3 GTSM is configured.
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NOTE: The ospfv3 valid-ttl-hops command has two functions: enabling the OSPFv3 GTSM and configuring the TTL value to be detected. The vpn-instance parameter is valid only for the latter function.
The valid TTL range of detected packets is [255 - hops + 1, 255].
- Run ospfv3 valid-ttl-hops [ hops ] [ vpn-instance vpn-instance-name ]
- Set the default action for packets that do not match
the GTSM policy.
GTSM only checks the TTL values of packets that match the GTSM policy. Packets that do not match the GTSM policy can be allowed or dropped.
You can enable the log function to record packet drop for troubleshooting.
Perform the following configurations on the GTSM-enabled router:
- Run gtsm default-action { drop | pass }
The default action for packets that do not match the GTSM policy is configured.
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NOTE: If the default action is configured but no GTSM policy is configured, GTSM does not take effect.
This command is supported only on the Admin-VS and cannot be configured in other VSs. This command takes effect on all VSs.
- Run gtsm default-action { drop | pass }
Checking the Configurations
Run the following commands to check the previous configurations.
Run the display gtsm statistics { slot-id | all } command to view the statistics about the GTSM.
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NOTE: This command is supported only on the Admin-VS.
Run the display gtsm statistics command. Then, you can view the statistics about the GTSM, including the total number of protocol packets, the number of packets that are allowed to pass through, and the number of dropped packets. For example:
<HUAWEI> display gtsm statistics all GTSM Statistics Table --------------------------------------------------------------- SlotId Protocol Total Counters Drop Counters Pass Counters --------------------------------------------------------------- 2 BGP 18 0 18 2 BGPv6 0 0 0 2 OSPF 0 0 0 2 LDP 0 0 0 2 OSPFv3 0 0 0 2 RIP 0 0 0 ---------------------------------------------------------------
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