Step Description Command Keys
14 Enable key transmitting in GRE tunnel
header (according to RFC 2890) and
set the key value. Configured only on
the both tunnel sides.
(optional).
esr(config-gre)# key <KEY> <KEY> – KEY value, takes
values in the range of
[1..2000000].
Default value: key is not
transmitted.
15 Enable the calculation of the
checksum and entry it to the GRE
header of the packets to be sent. Also
it is necessary to enable verifying of
the checksum on the remote side.
(optionally)
esr(config-gre)# local checksum
16 Enable verification of the presence
and consistency of checksum values
in the headers of GRE packets being
received. Also it is necessary to
enable calculation of the checksum on
the remote side.
(optionally)
esr(config-gre)# remote checksum
17 Enable the check for tunnel remote
gateway availability (optionally)
esr(config-gre)# keepalive enable
18 Change the keepalive packets timeout
from the opposing party (optional)
esr(config-gre)# keepalive timeout
<TIME>
<TIME> – time in seconds,
takes values of [1..32767].
Default value: 10
19 Change the number of attempts to
check the availability of a tunnel
remote gateway (optionally)
esr(config-gre)# keepalive retries
<VALUE>
<VALUE> – number of
attempts, takes values in the
range of [1..255].
Default value: 5
20 Specify the IP address for the
keepalive mechanism (mandatory in
ethernet mode)
esr(config-gre)# keepalive dst-
address <ADDR>
<ADDR> – IP address to check
GRE tunnel capability.
21 Change the time interval during which
the statistics on the tunnel load is
averaged (optional).
esr(config-gre)# load-average
<TIME>
<TIME> – interval in seconds,
takes values of [5..150].
Default value: 5
22 Enable sending snmp-trap about
tunnel enabling/disabling.
esr(config-gre)# snmp init-trap
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