Configures BGP routers
that interconnect to non-broadcast networks. Note that a remote
AS number must be specified for a neighbor before other parameters
can be configured.
Platform:
ASR 5000
ASR 5500
Privilege:
Security Administrator,
Administrator
Syntax
[ 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 encrypted 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 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 a BGP neighbor. ip_address must be
in IPv4 dotted-decimal or IPV6 colon-separated-hexadecimal notation.
activate
Enable 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
capability graceful-restart
Configures BGP graceful
restart attributes.
default-originate [ route-map map_name ]
Enables the origination
of 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 }
Filters updates to
and from this neighbor based on a route access list. dist_list:
The name or number of an existing route-access-list. Default: No
filtering is performed.
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. number must
be an integer from 1 through 255. Default hop count: 255
encrypted password encrypted password
Specifies an encrypted
password that is used only inside configuration files. This should
be an alphanumeric string of 1 through 523 characters.
fall-over bfd [ multihop ]
Enables Bidirectional
Fwarding Detection (BFD) multihop support for fallover.
This command adds or
modifies a session in BFD for the BGP peer. If there is an existing session
in BFD (same source-address/destination address), BGP
or OSPF protocol will
be added to the list of clients for the BFD session. BGP
or OSPF will then
be notified when there is a change in the BFD session state.
If there is no such
BFD session, a new session is added in BFD. For MH-BFD, the session inherits
the parameters including min-tx, min-rx, multiplier and authentication
from the multihop-peer configuration in BFD by matching the destination
address. If the parameters (interval) are not configured in BFD,
then the BFD session will be in Admin-down state.
BGP adds a session
in BFD only when the BGP peer is Established state. If there is
a state transition in bgp where the peer is no longer in established
state, then the bfd session is deleted. It will be added again,
once the peer comes back to Established state.
filter-list filt_list { in | out }
Establishes BGP filters
based on an AS path access list. filt_list is
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.
Default: No maximum
prefix limit.
max_num:
Specifies the maximum number of prefixes permitted. This must be
an integer from 1 through 4294967295.
[ 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 and
the neighbor connection is reset. 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
Disables the next hop
calculation for this neighbor.
password password
Specifies a password
that is only used inside configuration files. This should be an alphanumeric
string of 1 through 24 characters.
remote-as AS_num
Specify the AS number
of the BGP neighbor.
AS_num:
Specifies the neighbor’s AS number as an integer from 1
through 65535.
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 for a neighbor to restart. rest_time must
be an integer between 1 and 3600.
route-map map_name { in | out }
Applies a route map
to the neighbor. map_namei
s 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
extended and standard 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 Service Redundancy Protocol SRP-enabled resources are modified.
timers {[ connect-interval conn_time ] | [ keepalive-interval keep_time holdtime-interval hold_time ]}
Specifies BGP timers
for this 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
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. value 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.
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
IMPORTANT: