BGP IP VRF Configuration Mode Commands

 

The Border Gateway Protocol (BGP) IP VRF (Virtual Routing and Forwarding) Configuration Mode is used to configure properties for BGP-4 routing.

Important: The VRF must have been preconfigured using the ip vrf command in the Context Configuration mode before you can enter this configuration mode.

Important: The commands or keywords/variables that are available are dependent on platform type, product version, and installed license(s).

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.

route-distinguisher

Assigns a route distinguisher (RD) for the VRF that helps identify a VPN in a provider’s network and allows for overlapping IP space. The route distinguisher must be a unique value on the router for each VRF.

Product

All

Privilege

Security Administrator, Administrator

Syntax

route-distinguisher { as_value | ip_address } rd_value

route-distinguisher as_value rd_value

Identifies the target VRF by an autonomous system (AS) number. ASN value is a 16-bit ASN expressed as an integer from 0 through 65535.

route-distinguisher ip_address rd_value

Identifies the target VRF by its IP address. ip_address is entered using IPv4 dotted-decimal notation.

rd_value

rd_value is a unique route distinguisher identifier and must be an integer from 0 through 4294967295.

Usage

Use this command to assign a router distinguisher (RD) for the IP VRF. The combination of AS number or IP address and RD value must be unique for every VRF configured. The RD is added to the beginning of the pool addresses to change them into globally unique VPN-IPv4 prefixes.

If the RD is not configured for a VRF, user cannot enter into the BGP Address-Family mode for that VRF to configure the neighbors or other related BGP commands.

An RD assigned to a VRF cannot be changed until the existing VRF is deleted or removed and reconfigured.

Example

The following command assigns a router distinguisher 12345 to VRF with AS number 300:

route-distingusher 300 12345

The following command assigns a router distinguisher 12345 to VRF with IP address 10.5.3.4:

route-distingusher 10.5.3.4 12345

route-target

Adds an export and/or import list of extended route target communities to the VRF. BGP uses an extended-community attribute, the route target, to filter appropriate VPN routes into the correct VRFs. You configure the export list on the VRF to specify export route targets. When BGP advertises a route from this VRF’s forwarding table, it associates the list of export route targets with the route and includes this attribute in the update message that advertises the route. You also configure a route-target import list on each VRF to specify import route targets.

Product

All

Privilege

Security Administrator, Administrator

Syntax

route-target { both | import | export } { as_value | ip_address } rt_value

route-target both

Creates a list of import and export route targets for the VRF with the same parameters. The list contains an AS number or IP address along with a route target (RT) value.

route-target import

Creates a list of import RTs for the VRF with the same parameters. The list contains an AS number or IP address along with an RT value.

route-target export

Creates a list of export RTs for the VRF with the same parameters. The list contains an AS number or IP address along with an RT value.

as_value

Specifies a 16-bit autonomous-system (AS) number expressed as an integer from 0 through 65535.

ip_address

Specifies an IP address in IPv4 dotted-decimal notation.

rt_value

Specifies a unique RT identifier as an integer from 0 through 4294967295.

Usage

Use this command to create the list of export and/or import route target extended communities for VRF.

A maximm of 5 route targets can be defined with this command up to release 9.0.

A maximm of 10 route targets can be defined with this command from release 10.0 onward.

Important: This command must be executed for each route target extended community.

Example

The following command creates an export list of route target extended community 12345 for VRF with AS number 300:

route-target export 300 12345

The following command creates an export list of route target extended community 12345 for VRF with IP address 192.168.1.2:

route-target export 192.168.1.2 12345

 

 

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