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314470-15.5 Rev 00 21-1
Chapter 21
Configuring GRE, NAT, RIPSO, and BFE Services
Version 15.5.0.0
The following information supplements Chapter 1, “Configuring GRE Tunnels,”
in Configuring GRE, NAT, RIPSO, and BFE Services.
Configuring GRE Keepalive Functionality
Beginning with version 15.5.0.0, BayRS provides a more robust environment for
packet forwarding over Generic Routing Encapsulation (GRE) tunnels by creating
a keepalive mechanism that enables a router to monitor GRE traffic from a remote
end point. When this feature is enabled, a router can verify that the status of a
tunnel’s state is ‘up’ before it forwards packets over it.
You configure GRE keepalive functionality by performing the following tasks:
Enabling or disabling keepalive messages
Configuring the keepalive retry timeout interval
Configuring the keepalive retries value
The output for the following BCC show commands is enhanced to provide
information about the GRE keepalive mechanism:
show gre logical-ip-tunnels
show gre logical-ipx-tunnels
show gre physical-tunnels
For information on the enhanced output to these BCC show commands, see
Chapter 22, “Reference for BCC IP show Commands in this document.
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