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- Table of Contents
-
- 04-Layer 3—IP Services Command Reference
- 00-Preface
- 01-ARP commands
- 02-IP addressing commands
- 03-DHCP commands
- 04-DNS commands
- 05-mDNS gateway commands
- 06-mDNS relay commands
- 07-IP forwarding basics commands
- 08-Fast forwarding commands
- 09-Adjacency table commands
- 10-IRDP commands
- 11-IP performance optimization commands
- 12-UDP helper commands
- 13-IPv6 basics commands
- 14-DHCPv6 commands
- 15-IPv6 fast forwarding commands
- 16-Tunneling commands
- 17-GRE commands
- 18-HTTP redirect commands
- Related Documents
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| Title | Size | Download |
|---|---|---|
| 17-GRE commands | 36.52 KB |
GRE commands
gre key
Use gre key to configure a key for a GRE tunnel interface.
Use undo gre key to restore the default.
Syntax
gre key key
undo gre key
Default
No key is configured for a GRE tunnel interface.
Views
Tunnel interface view
Predefined user roles
network-admin
Parameters
key: Specifies the key for the GRE tunnel interface, in the range of 0 to 4294967295.
Usage guidelines
You can configure a GRE key to check for the validity of packets received on a GRE tunnel interface.
When a GRE key is configured, the sender puts the GRE key into each sent packet. The receiver compares the GRE key in the received packet with its own GRE key. If the two keys are the same, the receiver accepts the packet. If the two keys are different, the receiver drops the packet.
Both ends of a GRE tunnel must have the same key or no key.
Examples
# Configure the GRE key as 123 for the GRE tunnel interface Tunnel 2.
<Sysname> system-view
[Sysname] interface tunnel 2 mode gre
[Sysname-Tunnel2] gre key 123