RUGGEDCOM ROX II
CLI User Guide
Chapter 12
Tunneling and VPNs
Deleting a GRE Tunnel
403
Traditionally, GRE tunnels are stateless, meaning that remote endpoints retain no information about one another.
As a result, an endpoint will not know when the other endpoint becomes unreachable and continue sending
frames, even though the other end is unable to receive them.
With keepalive messages enabled, RUGGEDCOM ROX II will send keepalive messages to the other endpoint and
wait for a response. If a response is not received before the next message is scheduled to be sent, it begins to
count the number of consecutive messages sent that did not receive a reply. After so many failures to reply,
the other endpoint is considered unreachable and a
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alarm is raised. This is the cue to the network
administrator to bring down the GRE tunnel and investigate.
By default, keepalive messages are sent every 10 seconds and the remote endpoint has three opportunities to
reply. These thresholds are user configurable.
To enable or disable keepalive messages for a GRE tunnel, do the following:
1. Make sure the CLI is in Configuration mode.
2. Enable or disable keepalive messages by typing:
Enable
tunnel
gre
name
gre-keepalives enabled
Disable
no
tunnel gre
name
gre-keepalives enabled
Where
name
is the interface name of the GRE tunnel network. The interface name must start with a lowercase
letter, but may contain any combination of lowercase letters, numbers and dashes up to a maximum of 10
characters. The prefix
gre-
will be added to this interface name.
3. If keepalive messages are enabled, configure the following parameters:
Parameter
Description
interval { interval }
Synopsis:
A 16-bit unsigned integer between 1 and 32767
Default:
10
The interval in second(s) at which keepalive messages are sent to the remote endpoint.
retries { retries }
Synopsis:
An 8-bit unsigned integer between 1 and 255
Default:
3
The number of keepalive message the remote endpoint can ignore before it is considered
unreachable.
4. Type
commit
and press
Enter
to save the changes, or type
revert
and press
Enter
to abort.
Section 12.7.6
Deleting a GRE Tunnel
To delete a GRE tunnel, do the following:
1. Make sure the CLI is in Configuration mode.
2. Delete the GRE tunnel by typing:
no
tunnel gre
name
Where:
•
name
is the name of the GRE tunnel
3. Type
commit
and press
Enter
to save the changes, or type
revert
and press
Enter
to abort.
Summary of Contents for RUGGEDCOM ROX II
Page 2: ...RUGGEDCOM ROX II CLI User Guide ii ...
Page 4: ...RUGGEDCOM ROX II CLI User Guide iv ...
Page 39: ...RUGGEDCOM ROX II CLI User Guide Table of Contents xxxix 19 5 VLANs 752 ...
Page 40: ...Table of Contents RUGGEDCOM ROX II CLI User Guide xl ...
Page 46: ...Preface RUGGEDCOM ROX II CLI User Guide xlvi Customer Support ...
Page 170: ...Chapter 5 System Administration RUGGEDCOM ROX II CLI User Guide 124 Deleting a Scheduled Job ...
Page 256: ...Chapter 6 Security RUGGEDCOM ROX II CLI User Guide 210 Enabling Disabling a Firewall ...
Page 402: ...Chapter 11 Wireless RUGGEDCOM ROX II CLI User Guide 356 Managing Cellular Modem Profiles ...
