HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 133

Configuring a tunnel interface, Configuration guidelines, Configuration procedure

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Configuring a tunnel interface Configure a Layer 3 virtual tunnel interface on each device on a tunnel so that devices at both ends can send, identify, and process packets from the tunnel. Configuration guidelines Follow these guidelines when you configure a tunnel interface: • Before configuring a tunnel interface on a switch, you may need create a service loopback group with its service type as Tunnel, and add unused Layer 2 Ethernet interfaces of the switch to the service loopback group. • On the switch, an encapsulated packet cannot be forwarded a second time at Layer 3 by using the destination address and routing table, but is sent to the loopback interface, which then sends the packet to the forwarding module for Layer 3 forwarding. You must reference a service loopback group on the tunnel interface. Otherwise, the tunnel interface will not be up and packets cannot be transmitted over the tunnel. For creation and configuration of a service loopback group, see Layer 2-LAN Switching Configuration Guide. • The tunnel bandwidth command does not change the actual bandwidth of the tunnel interface, but sets a bandwidth value for dynamical routing protocols to calculate the cost of a tunnel path. You can determine the value according to the bandwidth of the output interface. • You must configure a MTU no smaller than 1280 bytes for the tunnel (such as an IPv6 over IPv4 tunnel or an IPv6 over IPv6 tunnel). Configuration procedure To configure a tunnel interface: Step 1. Enter system view. 2. Create a tunnel interface and enter its view. Command system-view interface tunnel number 3. Configure the description for the interface. description text 4. Reference a service loopback group. service-loopback-group number 5. Set the MTU of the tunnel interface. mtu mtu-size Remarks N/A By default, no tunnel interface is created. Optional. By default, the description of a tunnel interface is Tunnelnumber Interface. By default, the tunnel does not reference any service loopback group. Optional. 64000 bytes by default. • An MTU set on any tunnel interface is effective on all existing tunnel interfaces. • You can issue this command multiple times, but only the last configuration takes effect. 125

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125
Configuring a tunnel interface
Configure a Layer 3 virtual tunnel interface on each device on a tunnel so that devices at both ends can
send, identify, and process packets from the tunnel.
Configuration guidelines
Follow these guidelines when you configure a tunnel interface:
•
Before configuring a tunnel interface on a switch, you may need create a service loopback group
with its service type as Tunnel, and add unused Layer 2 Ethernet interfaces of the switch to the
service loopback group.
•
On the switch, an encapsulated packet cannot be forwarded a second time at Layer 3 by using the
destination address and routing table, but is sent to the loopback interface, which then sends the
packet to the forwarding module for Layer 3 forwarding. You must reference a service loopback
group on the tunnel interface. Otherwise, the tunnel interface will not be up and packets cannot be
transmitted over the tunnel. For creation and configuration of a service loopback group, see
Layer
2—LAN Switching Configuration Guide.
•
The
tunnel bandwidth
command does not change the actual bandwidth of the tunnel interface, but
sets a bandwidth value for dynamical routing protocols to calculate the cost of a tunnel path. You
can determine the value according to the bandwidth of the output interface.
•
You must configure a MTU no smaller than 1280 bytes for the tunnel (such as an IPv6 over IPv4
tunnel or an IPv6 over IPv6 tunnel).
Configuration procedure
To configure a tunnel interface:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Create a tunnel
interface and enter its
view.
interface tunnel
number
By default, no tunnel interface is created.
3.
Configure the
description for the
interface.
description
text
Optional.
By default, the description of a tunnel
interface is
Tunnel
number
Interface
.
4.
Reference a service
loopback group.
service-loopback-group
number
By default, the tunnel does not reference
any service loopback group.
5.
Set the MTU of the
tunnel interface.
mtu
mtu-size
Optional.
64000 bytes by default.
•
An MTU set on any tunnel interface is
effective on all existing tunnel
interfaces.
•
You can issue this command multiple
times, but only the last configuration
takes effect.