ADTRAN 1000R Series tunnel sequence-datagrams

Command Reference Guide Tunnel Configuration Command Set

tunnel sequence-datagrams

Use the tunnel sequence-datagrams command 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.

Applicable Platforms

This command applies to the NetVanta 300, 1000R, 2000, 3000, 4000, and 5000 and Total Access 900

Series units.

Command History

Release 9.1 Command was introduced.

Functional Notes

Both ends of the tunnel must have sequence numb ering enabled. When both endpoints have sequence

numbering enabled, a p acket 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 beco m e out of se qu e nce du e to ne tw or k con dit ion s ou tside of the tu nn el en dpoints. It

may be difficult to establish a successful traffic flow after an out of sequence condition occurs.

Technology Review

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