Contents

• Generic Routing Encapsulation Commands

• bandwidth

• description (GRE)

• ipv4 address

• ipv4 mtu (LxVPN)

• ipv6 address (LxVPN)

• ipv6 mtu (LxVPN)

• keepalive

• mtu (GRE)

• shutdown (GRE)

• tunnel destination

• tunnel dfbit disable

• tunnel mode

• tunnel source

• tunnel tos

• tunnel ttl

Generic Routing Encapsulation Commands

---

This module describes the commands used to configure generic routing encapsulation (GRE).

For detailed information about GRE concepts, configuration tasks, and examples, refer to the Cisco ASR 9000 Series Aggregation Services Router L2VPN and Ethernet Services Configuration Guide.

• bandwidth
• description (GRE)
• ipv4 address
• ipv4 mtu (LxVPN)
• ipv6 address (LxVPN)
• ipv6 mtu (LxVPN)
• keepalive
• mtu (GRE)
• shutdown (GRE)
• tunnel destination
• tunnel dfbit disable
• tunnel mode
• tunnel source
• tunnel tos
• tunnel ttl

bandwidth

To set the tunnel interface bandwidth, use the bandwidth command in interface configuration mode. To undo the tunnel interface bandwidth that is set, use the no form of this command.

bandwidth kbps

no bandwidth kbps

Syntax Description

kbps	Interface bandwidth in kilobits per second (kbps). The range is from 0 to 4294967295. The default value is 100.

Command Default

None

Command Modes

interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operation
interface	read, write

Examples

This example shows how to set the bandwidth of the tunnel interface:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 6677
RP/0/RSP0/CPU0:router(config-if)# bandwidth 56789

description (GRE)

To specify the description of any interface, use the description command in the interface configuration mode. To undo the specified description, use the no form of the command.

description description-name

no description

Syntax Description

description-name

Description of the Interface.

Command Default

None

Command Modes

Interface Configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operation
interface	read, write

Examples

The following output shows how to specify the description of an interface:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 789
RP/0/RSP0/CPU0:router(config-if)# description Interface

ipv4 address

To set the IPv4 address of the tunnel interface, use the ipv4 address command in interface configuration mode. To remove the IPv4 addresses, use the no form of this command.

ipv4 address prefix subnet mask [ route-tag value | secondary [ route-tag value ] ]

no ipv4 address prefix subnet mask [ route-tag value | secondary [ route-tag value ] ]

Syntax Description

prefix	IPv4 address of the interface.
subnet mask	Subnet mask of the interface.
route-tag	Specifies the tag associated with the IP address.
value	Tag value.
secondary	Specifies the secondary IPV4 address.

Command Default

None

Command Modes

Interface configuration

Command History

Release	Modification
Release 4.2.1	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operations
network	read, write
acl	read, write

Examples

This example shows how to set the IPV4 address with route-tag option:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)#interface tunnel-ip 67 ipv4 address 10.1.1.2 6.7.7.8 
route-tag 78

This example shows how to set the IPV4 address with secondary option:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)#interface tunnel-ip 67 ipv4 address 1.2.3.4 7.8.9.8 
secondary route-tag 89

ipv4 mtu (LxVPN)

To set the IPv4 MTU on the tunnel interface, use the ipv4 mtu command in interface configuration mode. To remove the IPv4 MTU, use the no form of this command.

ipv4 mtu size

no ipv4 mtu size

Syntax Description

size	Size of the MTU in bytes. The range is from 68 to 65535.

Command Default

None

Command Modes

Interface configuration

Command History

Release	Modification
Release 4.2.1	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operations
network	read, write
acl	read, write

Examples

This example shows how to set the IPv4 MTU:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)#interface tunnel-ip 78 ipv4 mtu 78

ipv6 address (LxVPN)

To set the IPv6 address of the tunnel interface, use the ipv6 address command in interface configuration mode. To remove the IPv6 addresses, use the no form of this command.

ipv6 { address zone { prefix length | link-local } [ route-tag value ] | zone /length [ route-tag value ] }

no ipv6 { address zone { prefix length | link-local } [ route-tag value ] | zone /length [ route-tag value ] }

Syntax Description

zone	Specifies the IPv6 address of the interface.
prefix length	Specifies the length of the IPv6 address prefix, in bits. The range is from 1 to 128.
link-local	Specifies the link-local address.
route-tag	Specifies the tag associated with the address.
value	Tag value. The range is from 1 to 4294967295.

Command Default

None

Command Modes

Interface configuration

Command History

Release	Modification
Release 4.2.1	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operations
network	read, write
interface	read, write
ipv6	read, write

Examples

This example shows how to set the ipv6 address for a tunnel interface:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)#interface tunnel-ip 67 ipv6 address 10:2::3 link-local 
route-tag 78

ipv6 mtu (LxVPN)

To set the IPv6 MTU on the tunnel interface, use the ipv6 mtu command in interface configuration mode. To remove the IPv6 MTU, use the no form of this command.

ipv6 mtu size

no ipv6 mtu size

Syntax Description

size	Size of the MTU in bytes. The range is from 1280 to 65535.

Command Default

None

Command Modes

Interface configuration

Command History

Release	Modification
Release 4.2.1	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operations
network	read, write
interface	read, write
ipv6	read, write

Examples

This example shows how to set the IPv4 MTU:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)#interface tunnel-ip 78 ipv6 mtu 3456

keepalive

To enable keepalive for a tunnel interface, use the keepalive command. To remove keepalive, use the no form of this command.

keepalive [ time_in_seconds [retry_num] ]

no keepalive

Syntax Description

time_in_seconds	Specifies the frequency (in seconds) at which keepalive check is performed. The default is 10 seconds. The minimum value is 1 second.
retry_num	Specifies the number of keepalive retries before declaring that a tunnel destination is unreachable. The default is 3 retries. The minimum value is 1 retry.

Command Default

None

Command Modes

interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Use the keepalive command to enable keepalive for a tunnel interface.

Task ID

Task ID	Operations
interface	read, write

Examples

The following example shows how to configure interface tunnel:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 400
RP/0/RSP0/CPU0:router(config-if)# keepalive 30

mtu (GRE)

To set the MTU size of the tunnel interface, use the mtu command in interface configuration mode. To undo the MTU size of the tunnel interface that is set, use the no form of this command.

This is a Generic Routing Encapsulation (GRE) command.

mtu size

no mtu size

Syntax Description

size	Size of MTU in bytes. The default value is 1476.

Command Default

None

Command Modes

Interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operation
interface	read, write

Examples

This example shows how to set the MTU size of the tunnel interface:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 456
RP/0/RSP0/CPU0:router(config-if)# mtu 334

shutdown (GRE)

To shut down any interface, use the shutdown command in interface configuration mode. To start the interface, use the no form of the command.

This is a Generic Routing Encapsulation (GRE) command.

shutdown

no shutdown

This command has no keywords or arguments.

Command Default

None

Command Modes

Interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operation
interface	read, write

Examples

This example shows how to shut down a given interface:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 789
RP/0/RSP0/CPU0:router(config-if)# shutdown

tunnel destination

To specify a tunnel interface's destination, use the tunnel destination command. To remove the destination, use the no form of this command.

Note	The tunnel will not be operational until the tunnel destination is specified.

tunnel destination A.B.C.D

no tunnel destination A.B.C.D

Syntax Description

A.B.C.D

Specifies the IPv4 address of the host destination.

Command Default

None

Command Modes

interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operations
interface	read, write

Examples

The following example shows how to configure interface tunnel:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 400
RP/0/RSP0/CPU0:router(config-if)# tunnel destination 10.10.10.1
  

Related Commands

Command	Description
tunnel mode	Sets the encapsulation mode of the tunnel interface.
tunnel source	Sets a tunnel interface's source address.
tunnel tos	Specifies the value of the TOS field in the tunnel encapsulating packets.
tunnel ttl	Configures the Time-To-Live (TTL) for packets entering the tunnel.

tunnel dfbit disable

To configure the DF bit setting in the tunnel transport header, use the tunnel dfbit disable command. To revert to the default DF bit setting value, use the no form of this command.

tunnel dfbit disable

no tunnel dfbit disable

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

The tunnel dfbit disable command specifies the DF bit setting in the tunnel transport header. The default is to always set the DF bit. Hence, use the tunnel dfbit disable command to override the default.

Task ID

Task ID	Operations
interface	read, write

Examples

The following example shows how to configure interface tunnel:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 400
RP/0/RSP0/CPU0:router(config-if)# tunnel dfbit disable

Related Commands

Command	Description
tunnel destination	Specifies a tunnel interface's destination.
tunnel mode	Sets the encapsulation mode of the tunnel interface.
tunnel source	Sets a tunnel interface's source address.
tunnel tos	Specifies the value of the TOS field in the tunnel encapsulating packets.
tunnel ttl	Configures the Time-To-Live (TTL) for packets entering the tunnel.

tunnel mode

To set the encapsulation mode of the tunnel interface, use the tunnel mode command. To remove the encapsulation mode, use the no form of this command.

Note	The tunnel will not be operational until the encapsulation mode is specified. Only one mode can be specified for a tunnel instance at any given time.

tunnel mode gre ipv4

no tunnel mode

Syntax Description

This command has no keywords or arguments.

Command Default

Disabled

Command Modes

interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operations
interface	read, write

Examples

The following example shows how to configure interface tunnel:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 400
RP/0/RSP0/CPU0:router(config-if)#tunnel mode gre ipv4

Related Commands

Command	Description
tunnel destination	Specifies a tunnel interface's destination.
tunnel source	Sets a tunnel interface's source address.
tunnel tos	Specifies the value of the TOS field in the tunnel encapsulating packets.
tunnel ttl	Configures the Time-To-Live (TTL) for packets entering the tunnel.

tunnel source

To set a tunnel interface's source address, use the tunnel source command. To remove the source address, use the no form of this command.

Note	The tunnel will not be operational until the tunnel source is specified.

tunnel source { interface_name | A .B .C .D }

no tunnel source { interface_name | A .B .C .D }

Syntax Description

interface_name	Specifies the name of the interface whose IP address will be used as the source address of the tunnel. The interface name can be of a loopback interface or a physical interface.
A.B.C.D	Specifies the IPv4 address to use as the source address for packets in the tunnel.

Command Default

None

Command Modes

interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operations
interface	read, write

Examples

The following example shows how to configure interface tunnel:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 400
RP/0/RSP0/CPU0:router(config-if)# tunnel source 10.10.10.1
 

Related Commands

Command	Description
tunnel destination	Specifies a tunnel interface's destination.
tunnel mode	Sets the encapsulation mode of the tunnel interface.
tunnel tos	Specifies the value of the TOS field in the tunnel encapsulating packets.
tunnel ttl	Configures the Time-To-Live (TTL) for packets entering the tunnel.

tunnel tos

To specify the value of the TOS field in the tunnel encapsulating packets, use the tunnel tos command. To return to the default TOS value, use the no form of this command.

tunnel tos tos_value

no tunnel tos tos_value

Syntax Description

tos_value

Specifies the value of the TOS field in the tunnel encapsulating packets. The TOS value ranges between 0 to 255.

Command Default

Copies the TOS/COS bits of the internal IP header to the GRE IP header. In case of labeled payload, EXP bits are copied to TOS bits of the GRE IP header.

Command Modes

interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID	Operations
interface	read, write

Examples

The following example shows how to configure interface tunnel:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 400
RP/0/RSP0/CPU0:router(config-if)# tunnel tos 100

Related Commands

Command	Description
tunnel destination	Specifies a tunnel interface's destination.
tunnel mode	Sets the encapsulation mode of the tunnel interface.
tunnel source	Sets a tunnel interface's source address.
tunnel ttl	Configures the Time-To-Live (TTL) for packets entering the tunnel.

tunnel ttl

To configure the Time-To-Live (TTL) for packets entering the tunnel, use the tunnel ttl command. To undo the configuration, use the no form of this command.

tunnel ttl ttl_value

no tunnel ttl ttl_value

Syntax Description

ttl_value

Specifies the value of TTL for packets entering the tunnel. The TTL value ranges between 1 to 255.

Command Default

The default TTL value is set to 255.

Command Modes

interface configuration

Command History

Release	Modification
Release 4.2.0	This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

This command specifies the Time-To-Live for packets entering the tunnel so that the packets are not dropped inside the carrier network before reaching the tunnel destination.

Task ID

Task ID	Operations
interface	read, write

Examples

The following example shows how to configure interface tunnel:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface tunnel-ip 400
RP/0/RSP0/CPU0:router(config-if)#tunnel source 10.10.10.1

Related Commands

Command	Description
tunnel destination	Specifies a tunnel interface's destination.
tunnel mode	Sets the encapsulation mode of the tunnel interface.
tunnel tos	Specifies the value of the TOS field in the tunnel encapsulating packets.
tunnel source	Sets a tunnel interface's source address.