HP 7000 dl Router Tunnel checksum, Config#interface tunnel 1 config-tunnel 1#tunnel checksum

Command Reference Guide Tunnel Configuration Command Set

tunnel checksum

Use the tunnel checksum command to verify the checksum of incoming Generic Routing Encapsulation (GRE) packets and to include a checksum on outgoing packets. Use the no form of this command to disable checksum.

Syntax Description

No subcommands.

Default Values

By default, tunnel checksum is disabled.

Command Modes

(config-tunnel x)# Tunnel Interface Configuration Mode

Functional Notes

Both ends of the tunnel must have tunnel checksum enabled in order for a meaningful configuration. When both endpoints have tunnel checksum enabled, a packet with an incorrect checksum will be dropped. If the endpoints differ in their checksum configuration, all packets will still flow without any checksum verification.

Usage Examples

The following example enables checksum on the tunnel 1 interface:

(config)#interface tunnel 1 (config-tunnel 1)#tunnel checksum

Technology Review

When enabled, the tunnel checksum will be calculated for each outgoing GRE packet with the result stored in the GRE header. The checksum present bit will also be set in the header.

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