Loopback Interface Configuration Mode Commands

Loopback Interface Configuration Mode Commands
 
Use the Loopback Interface Configuration mode to create and manage loopback interfaces that provide IP addresses that are always available and reachable from any interface within a given context.
note_smallImportant: The commands or keywords/variables that are available are dependent on platform type, product version, and installed license(s).
crypto-map
Applies the specified IPSec crypto-map to this interface.
Product
All
Privilege
Security Administrator, Administrator
Syntax
crypto-map map_name [ secondary-address sec_ip_addr ]
no
Deletes the application of the crypto map on this interface.
map_name
Specifies the name of the crypto map being applied. The name is an alphanumeric string of 1 through 127 characters that is case sensitive.
secondary-address sec_ip_addr
Applies the crypto map to the secondary address for this interface that is specified by sec_ip_addr. sec_ip_addr must be specified using the IPv4 dotted-decimal or IPv6 colon-separated notation.
Usage
In order for ISAKMP and/or manual crypto maps to work, they must be applied to a specific interface using this command. Dynamic crypto maps should not be applied to interfaces.
The crypto map must be configured in the same context as the interface.
Example
To apply the IPSec crypto map named cmap1 to this interface, use the following command:
crypto-map cmap1
description
Use this command to configure the descriptive text for the current interface.
Product
All
Privilege
Security Administrator, Administrator
Syntax
description textno description
no
Clears the description for the interface.
text
Specifies the descriptive text to use. Fortext, enter an alphanumeric string of 0 through 79 characters. If spaces or special characters are required, the stirng must be bracketed with double quotation marks.
Usage
Set the description to provide any useful information on the interface’s primary function, services, end users.
Example
description sampleInterfaceDescriptiveText
end
Exits the current configuration mode and returns to the Exec mode.
Product
All
Privilege
Security Administrator, Administrator
Syntax
end
Usage
Use this command to return to the Exec mode.
exit
Exits the current mode and returns to the parent configuration mode.
Product
All
Privilege
Security Administrator, Administrator
Syntax
exit
Usage
Use this command to return to the parent configuration mode.
ip address
Use this command to configure the IP options for the current interface.
Product
All
Privilege
Security Administrator, Administrator
Syntax
ip address { ip_address ip_mask | ip_address/bitmask } [ secondary | srp-activate ]
no ip address ip_address
no
Deletes the IP address you specify from the interface configuration.
address {ip_address ip_mask | ip_address/bitmask} [ secondary | srp-activate ]
Configures the IP address and network mask for the interface.
Enter an ip_address ip_mask to specify an IP address and the subnet mask pair that identifies the IP address of the interface. ip_address is entered in IPv4 dotted-decimal or IPv6 colon-separated notation. Currently, the only value accepted for ip_mask is 255.255.255.255 (IPv4) or 120 (IPv6) .
For the network mask, ip_address/net_mask, enter the IP address and the length in bits of the network mask, Fo example, 192.168.1.0/32 (IPv4) or fe80::c0a8:100/32 (IPV6). Currently, the only value accepted for bit_mask is 32.
Use the secondary keyword ito configure a secondary IP address on the interface. This is referred to as multi-homing of the interface.
Use the srp-activate keyword to activate the IP address for Interchassis Session Recovery (ICSR).
Usage
Create and manage loopback interfaces for the current context.
Example
The following command configures IP address to associate with the interface:
ip address 1.2.3.4 255.255.255.255
The following command removes the associated IP address for the interface:
no ip address 10.2.3.4
ip vrf
Use this command to configure the IP VPN Routing Forwarding (VRF) instance for the current interface.
Product
All
Privilege
Security Administrator, Administrator
Syntax
ip vrf forwarding vrf_nameno vrf forwarding
no
Deletes the IP VRF instance you specify from the interface configuration.
vrf_name
Specifies the preconfigured IP VRF instance name to be used with this interface.
For vrf_name, enter a VRF instance name that was preconfigured via the ip vrf forwarding command in Context Configuration mode.
Usage
Use this command to associate a preconfigured IP VRF instance for the current interface.
Example
The following command associates a preconfigured IP VRF instance named vrf_1 with this interface:
ip vrf forwarding vrf_1
ipv6 address
Use this command to configure the IPv6 options for the current interface.
Product
All
Privilege
Security Administrator, Administrator
Syntax
ipv6 address ipv6_address ip_mask [ srp-activate ]
no iv6p address ipv6_address
no
Deletes the specified IPv6 address from the interface configuration.
address ipv6_address ip_mask [ srp-activate ]
Configures the IP address and network mask for the interface.
ipv6_address ip_mask specifies an IP address and the subnet mask pair that identifies the IPv6 address of the interface. Specify ipv6_address in IPv6 colon-separated notation.
The srp-activate keyword activates the IPv6 address for Session Recovery.
Usage
Create and manage loopback interfaces for the current context and enable Session Redundancy Protocol (SRP) when appropriate.
Example
The following command configures an IPv6 address to associate with the interface and enables SRP:
ipv6 address 2001:268:2008:b::1021/128 srp-activate
 
 
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