HP 7000 dl Router manual Tunnel sequence-datagrams

Command Reference Guide Tunnel Configuration Command Set

tunnel sequence-datagrams

Use the tunnel sequence-datagramscommand to enable sequence number checking on incoming Generic Routing Encapsulation (GRE) packets, to drop packets arriving out of order, and to include a sequence number in outgoing packets. Use the no form of this command to disable sequence number checking.

Syntax Description

No subcommands.

Default Values

By default, this command is disabled.

Command Modes

(config-tunnel x)# Tunnel Interface Configuration Mode

Functional Notes

Both ends of the tunnel must have sequence numbering enabled. When both endpoints have sequence numbering enabled, a packet arriving with a sequence number less than the current expected value will be dropped. If the endpoints differ in their sequence numbering configuration, all packets will still flow without any sequence number verification. Be careful enabling sequence number verification on a tunnel. The tunnel can easily become out of sequence due to network conditions outside of the tunnel endpoints. It may be difficult to establish a successful traffic flow after an out of sequence condition occurs.

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When enabled, the next valid sequence number will be placed in the GRE header of each outgoing packet, and the sequence number present bit will be set.

Usage Examples

The following example enables sequence number processing on the tunnel interface:

(config)#interface tunnel 1

(config-tunnel 1)#tunnel sequence-datagrams

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