Configures the Virtual Routing and Forwarding (VRF) address family peers for BGP routers that interconnect to non-broadcast networks.
Privilege
Security Administrator, Administrator
Mode
Exec > Global Configuration > Context Configuration > BGP
Configuration > BGP Address-Family Configuration
configure > context
context_name
> router bgp
as_number
> address-family
address_family_type
Entering the above command sequence results in the following prompt:
[context_name]host_name(config-bgp-af-vpnv4)#
Syntax
Syntax Description
[ 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 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 Guidelines
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
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