Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 746)

716 Multi-Service IronWare Switching Configuration Guide
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GRE IP tunnel
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Configuring a tunnel interface for GRE encapsulation
To configure a specified tunnel interface for GRE encapsulation, enter the following command.
Brocade(config)# interface tunnel 1
Brocade(config-tnif-1)tunnel mode gre ip
Syntax: [no] tunnel mode gre ip
The gre parameter specifies that the tunnel will use GRE encapsulation
The Ip parameter specifies that the tunnel protocol is IP.
Configuring an IP address for a tunnel interface
To configure an IP address for a specified tunnel interface, enter the following command.
Brocade(config)# interface tunnel 1
Brocade(config-tnif-1)ip address 10.10.3.1/24
Syntax: [no] ip address ip-address
The ip-address variable is the IP address being configured for the specified tunnel interface.
Configuring keep alive support
This parameter is optional. It lets the device maintain a tunnel in an up or down state based upon
the periodic sending of keep alive packets and the monitoring of responses to the packet. If the
packets fail to reach the tunnel’s far end more frequently than the configured number of retries,
the tunnel is placed in a down state. A keep alive packet is a GRE IP packet with no payload.
To configure the keep alive option, enter the following command.
Brocade(config)# interface tunnel 1
Brocade(config-tnif-1)keepalive 5 4
Syntax: [no] keepalive seconds retries
The seconds variable specifies the number of seconds between each initiation of a keep alive
message. The range for this interval is 1 – 32767 seconds. The default value is 10 seconds.
The retries variable specifies the number of times that a packet is sent before the system places
the tunnel in the down state. Possible values are from 1 – 255. The default number of retries is 3.
Configuring a TTL value
This is an optional parameter that allows you to set the Time-to-Live value for the outer IP header of
the GRE tunnel packets.
To configure the TTL value, enter the following command.
Brocade(config)# interface tunnel 1
Brocade(config-tnif-1)tunnel ttl 100
Syntax: [no] tunnel ttl ttl-value
The ttl--value variable specifies a TTL value for the outer IP header. Possible values are 1 - 255. The
default value is 255.