Configures the IPv4/IPv6 Address Family 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-v6)#
Syntax
Syntax Description
[ no ] neighbor ip_address { activate | advertisement-interval adv_time | capability graceful-restart | default-originate [ route-map map_name ] | distribute-list dist_list { in | out } | ebgp-multihop [ max-hop number ] encrypted password encryp_password fall-over bfd multihop | filter-list filt_list { in | out } | max-prefix max_num [ threshold thresh_percent ] [ warning-only ] next-hop-self | password password | remote-as AS_num | remove-private-AS | restart-time rest_time | route-map map_name { in | out} | send-community { both | extended | standard } | shutdown | srp-activated-soft-clear | timers { connect-interval connect_interval [ keepalive-interval keepalive_interval holdtime-interval holdtime_interval [ min-peer-holdtime-interval min_peer_hold_interval ] ] | keepalive-interval keepalive_interval holdtime-interval holdtime_interval { connect-interval connect_interval | min-peer-holdtime-interval min_peer_hold_interval [ connect-interval connect_interval ] } } | update-source ip_address | weight value }
no
Delete the specified parameter from the router configuration.
neighbor
ip_address
Specifies the IP address of a BGP neighbor.
ip_address must be in IPv4 dotted-decimal or
IPV6 colon-separated-hexadecimal notation.
activate
Enables the exchange of routes with this neighbor.
advertisement-interval
adv_time
Specifies the minimum interval (in seconds) between sending BGP
routing updates.
adv_time must be an integer from 0 through
600. Default: 30
capability graceful-restart
Configures graceful re-start attributes.
default-originate [
route-map
map_name ]
Specifies the default originate 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 }
Filters updates to and from this neighbor based on a route access
list. Default: No filtering is performed.
dist_list is 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 ]
Allows eBGP neighbors that are not on directly connected networks.
max-hop
number: Specifies the maximum number of hops
allowed to reach a neighbor as an integer from 1 through 255. Default hop
count: 255
encrypted password
encryp_password
Specifies the encrypted password that is used only inside
configuration files. This is an alphanumeric string of 1 through 24 characters.
fall-over bfd
multihop
Supports Bidirectional Forwarding Detection (BFD) multihop for
fallover.
filter-list
filt_list
{ in | out }
Establishes BGP filters based on an autonomous system (AS) path access
list.
filt_list is 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 ]
Specifies the maximum number of prefixes accepted from this peer. When
the maximum is exceeded the neighbor connection is reset.
max_num is an integer from 1 through
4294967295. Default: No maximum prefix limit.
threshold
thresh_percent: Specifies a percentage value
of when the BGP table is full. When this value is reached peer warnings are
sent to the neighbor.
thresh_percent must be an integer from 1
through 100.
warning-only: Specifies that only a warning
message is sent when the limit is exceeded. The neighbor connection is not
reset
next-hop-self
ip_address
Disables the next hop calculation for this neighbor.
password
password
Sets a
password expressed as an alphanumeric string
of 1 through 24 characters.
remote-as
AS_num
Specify the AS number of the BGP neighbor as an integer from 1 through
4294967295.
remove-private-AS
Removes the private AS number from outbound updates. Default: Do not
remove the private AS number.
restart-time
rest_time
Specifies the maximum time (in seconds) required to for neighbor to
restart as an integer from 1 through 3600.
route-map
map_name {
in |
out }
Applies a route map to the neighbor.
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.
send-community {
both |
extended |
standard }
Sends the community attributes to a peer router (neighbor).
both:Sends standard and extended community
attributes
extended:Sends extended community
attributes.
standard:Sends standard community
attributes.
shutdown
Administratively shuts 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
connect_interval ] | [
keepalive-interval
keepalive_interval
holdtime-interval
holdtime_interval ] }
Sets BGP timers for the specified neighbor.
connect-interval
connect_interval: Specifies the connect timer
(in seconds) as an integer from 0 through 65535. The default is 60 seconds.
keepalive-interval
keepalive_interval: Specifies 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
holdtime_interval: Specifies 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.
min-peer-holdtime-interval
min_peer_hold_interval: Specifies the minimum
acceptable hold time (in seconds) from peer for a keepalive message before
declaring a neighbor dead.
min_peer_hold_interval must be an integer
from 0 through 65535. The default is 90 seconds.
update-source
ip_address
Binds 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
Sets the default weight for routes from this neighbor as 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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