# BGP Address-Family (VRF) Configuration Mode Commands

The Border Gateway Protocol (BGP) Address-Family (VRF) Configuration Mode is used to configure the Virtual Routing and Forwarding address family information.

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.
neighbor

Configures the Virtual Routing and Forwarding (VRF) address family for BGP routers that interconnect to non-broadcast networks.
Platform:

ASR 5000

ASR 5500
Product:

All
Privilege:

Security Administrator, Administrator
Syntax

    [ no ]
    neighbor ip_address { activate | advertisement-interval adv_time | default-originate [ route-map map_name ] | distribute-list dist_list { in | out } | ebgp-multihop [ max-hop number ] | filter-list filt_list { in | out } | max-prefix max_num [ threshold thresh_percent ] [ warning-only ] | remote-as AS_num | remove-private-AS | route-map map_name { in | out } | shutdown | srp-activated-soft-clear | timers { [ connect-interval  conn_time ] | [ keepalive-interval keep_time holdtime-interval hold_time ] } | update-source ip_address | weight value }

no

Delete the specified parameter from the router configuration.
neighbor ip_address

Specifies the IP address of the peer router (neighbor) in IPv4 dotted-decimal or IPv6 colon-separated-hexadecimal notation.
activate

Enables the exchange of routes with this neighbor.
advertisement-interval adv_time

The minimum interval (in seconds) between sending BGP routing updates.

adv_time must be an integer from 0 through 600.

Default: 30
default-originate [ route-map map_name ]

Originate default routes to this neighbor

route-map map_name: Specifies the route-map that contains the criteria to originate default routes. map_name must be the name of an existing route-map in the current context.
distribute-list dist_list {in | out}

Filter updates to and from this neighbor based on a route access list.

Default: No filtering is performed.

dist_list: The name or number of an existing route-access-list.

in: Indicates that incoming advertised routes should be filtered.

out: Indicates that outgoing advertised routes should be filtered.
ebgp-multihop [max-hop number]

Allow external BGP (eBGP) neighbors not on directly connected networks.

max-hop number: The maximum number of hops allowed to reach a neighbor. number must be an integer from 1 through 255.

Default hop count: 255
filter-list filt_list { in | out }

Establish BGP filters based on an AS path access list

filt_list: The name of an existing AS path access list.

in: Indicates that incoming advertised routes will be filtered.

out: Indicates that outgoing advertised routes will be filtered.
max-prefix max_num [ threshold thresh_percent ] [ warning-only ]

The maximum number of prefixes accepted from this peer. When the maximum is exceeded the neighbor connection is reset.

max_num: Specifies the maximum number of prefixes permitted. This must be an integer from 1 through 4294967295.

Default: No maximum prefix limit.

threshold thresh_percent: A percentage value which specifies that when the BGP table is the specified percentage full from this peer warnings are sent to the neighbor. thresh_percent must be an integer from 1 through 100.

warning-only: This keyword specifies that only a warning message is sent when the limit is exceeded. The neighbor connection is not reset
remote-as AS_num

Specify the AS number of the BGP neighbor.

AS_num: The neighbor’s autonomous system number. must be an integer from 1 through 65535.
remove-private-AS

Remove the private AS number from outbound updates.

Default: Do not remove the private AS number.
route-map map_name { in | out }

Apply a route map to the neighbor.

map_name: Specifies the route-map apply. map_name must be the name of an existing route-map in the current context.

in: Indicates that the route map applies to incoming advertisements.

out: Indicates that the route map applies to outgoing advertisements.
shutdown

Administratively shut down this neighbor. This disables exchanging routes or configuring parameters for this neighbor.

srp-activated-soft-clear

Enables BGP updates when SRP-enabled resources are modified.
timers {[ connect-interval conn_time ] | [ keepalive-interval keep_time holdtime-interval hold_time ]}

BGP timers for the specified neighbor.

connect-interval conn_time: Specifies the connect timer in seconds. conn_time must be an integer from 0 through 65535. The default is 60 seconds.

keepalive-interval keep_time: The frequency (in seconds) at which the current BGP router sends keepalive messages to its neighbor. keep_time must be an integer from 0 through 65535. The default is 30 seconds.

Holdtime-interval hold_time: The interval (in seconds) the router waits for a keepalive message before declaring a neighbor dead. hold_time must be an integer from 0 through 65535. The default is 90 seconds.
update-source ip_address

use this keyword to bind the specified IP address to the BGP socket that is used to communicate to the peer. ip_address is an IPv4 address in dotted-decimal notation.

In most cases you should set the update-source address to the address of the loopback interface in the current context. By doing this, the TCP connection does not go down until there is no route for the loopback address in the peering router.
weight value

This command sets the default weight for routes from this neighbor.

value: This must be an integer from 0 through 65535.

Default: 0
Usage:

Use this command to set parameters for communication with a specified neighbor. The chassis supports a maximum of 64 peers per context.

IMPORTANT:

A remote AS number must be specified for a neighbor before other parameters can be configured.
Example:
The following command specifies that the neighbor at the IP address 192.168.100.25 has an AS number of 2000:

    neighbor 192.168.100.25
    remote-as 2000

The following command allows BGP neighbors that are a maximum of 27 hops away:

    neighbor 192.168.100.25
    ebgp-multihop max-hop 27

The following command sets the minimum interval between sending routing updates to 3 minutes (180 seconds):

    neighbor 192.168.100.25
    advertisement-interval 180

The following command sets the default weight for all routes from the specified neighbor to 100:

    neighbor 192.168.100.25
    weight 100

redistribute

Redistributes routes into BGP. This means that any routes from another protocol are redistributed to BGP neighbors using the BGP protocol.
Platform:

ASR 5000

ASR 5500
Product:

All
Privilege:

Security Administrator, Administrator
Syntax

    [no] redistribute {connected | ospf | rip | static} [route-map map_name]

no

Remove the specified redistribution parameters from the BGP router configuration.
connected

Specifies that connected routes will be redistributed.
ospf

Specifies that Open Shortest Path First (OSPF) routes will be redistributed
rip

Specifies that Routing Information Protocol (RIP) routes will be redistributed. (RIP is not supported at this time.)
static

Specifies that static routes will be redistributed.
route-map map_name

Filter routes through the specified route map before redistribution.

map_name specifies the name of the route-map to use and must be specified as an alphanumeric string of 1 through 79 characters.
Usage:

Use this command to specify what routes this BGP router should redistribute into BGP.
Example:
The following command redistributes OSPF routes after filtering them through the route map named Map1:

    redistribute ospf route-map
    Map1

The following command removes the redistribution of OSPF routes from the router’s configuration:

    no redistribute ospf
    route-map Map1