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tunnel keepalive
Configure the tunnel keepalive target, interval and attempts.
Syntax
tunnel keepalive {ip-address | ipv6-address}[interval
{seconds}] [attempts {count | unlimited}]
To disable the tunnel keepalive probes use the no tunnel keepalive command.
Parameters
ip-address ipv6
address
Enter the IPv4 or IPv6 address of the peer to which
the keepalive probes will be sent.
interval
seconds
Enter the keyword interval then the interval time, in
seconds, after which the restart process to keepalive probe
packets.
The range is from 5 to 255. The default is 5.
count
(OPTIONAL) Enter the keyword count to count packets
processed by the filter.
The range is from 3 to 10. The default is 3.
unlimited
Enter the keyword unlimited to specify the unlimited
number of keepalive probe packets.
Defaults Tunnel keepalive is disabled.
Command
Modes
INTERFACE TUNNEL
Command
History
Version Description
9.7(0.0) Introduced on the S6000-ON.
9.5(0.1) Introduced on the Z9500.
9.4(0.0) Introduced on the S4810, S4820T, S6000 and Z9000.
Usage
Information
Enabling tunnel keepalive causes ICMP echo packets to be sent to the keepalive
target. The ICMP echo will be sourced from the tunnel interface logical IPv4 or
IPv6 address and will be tunnel encapsulated. The response will be accepted
whether it returns tunnel encapsulated or not.
When configuring tunnel keepalive at both end points of a tunnel interface it is
recommended to set the tunnel keepalive target to the logical IPv4 or IPv6 address
of the far end tunnel peer, rather than to the tunnel destination. This reduces the
chance of both ends of the tunnel staying in keepalive down state. If both ends get
1814
Tunneling