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Configuring BGP
Configuring Advanced BGP Features
IPC-321
Cisco IOS IP Configuration Guide
Assigning Options to the Peer Group
After you create a peer group, you configure the peer group with neighbor commands. By default,
members of the peer group inherit all the configuration options of the peer group. Members can also be
configured to override the options that do not affect outbound updates.
Peer group members will always inherit the following attributes: minimum-advertisement-interval,
next-hop-self, out-route-map, out-filter-list, out-dist-list, remote-as (if configured), version, and
update-source. All the peer group members will inherit changes made to the peer group.
To assign configuration options to an individual neighbor, specify any of the following commands using
the IP address. To assign the options to a peer group, specify any of the commands using the peer group
name. Use the following commands in router configuration mode as needed.
Command Purpose
Router(config-router)# neighbor {ip-address |
peer-group-name} remote-as as-number
Specifies a BGP neighbor.
Router(config-router)# neighbor {ip-address |
peer-group-name} description text
Associates a description with a neighbor.
Router(config-router)# neighbor {ip-address |
peer-group-name} default-originate [route-map
map-name]
Allows a BGP speaker (the local router) to send the default
route 0.0.0.0 to a neighbor for use as a default route.
Router(config-router)# neighbor {ip-address |
peer-group-name} send-community
Specifies that the communities attribute be sent to the
neighbor at this IP address.
Router(config-router)# neighbor {ip-address |
peer-group-name} update-source interface-type
Allows iBGP sessions to use any operational interface for
TCP connections.
Router(config-router)# neighbor {ip-address |
peer-group-name} ebgp-multihop
Allows BGP sessions, even when the neighbor is not on a
directly connected segment. The multihop session is not
established if the only route to the address of the multihop
peer is the default route (0.0.0.0).
Router(config-router)# neighbor {ip-address |
peer-group-name}
advertisement-interval seconds
Sets the minimum interval between sending BGP routing
updates.
Router(config-router)# neighbor {ip-address |
peer-group-name} maximum-prefix maximum [threshold]
[warning-only]
Limits the number of prefixes allowed from a neighbor.
Router(config-router)# neighbor {ip-address |
peer-group-name} weight weight
Specifies a weight for all routes from a neighbor.
Router(config-router)# neighbor {ip-address |
peer-group-name} distribute-list {access-list-number
| access-list-name}
{in | out}
Filters BGP routing updates to and from neighbors, as
specified in an access list.
Router(config-router)# neighbor {ip-address |
peer-group-name} filter-list access-list-number {in |
out | weight weight}
Establishes a BGP filter.
Router(config-router)# neighbor {ip-address |
peer-group-name} next-hop-self
Disables next hop processing on the BGP updates to a
neighbor.
Router(config-router)# neighbor {ip-address |
peer-group-name} version value
Specifies the BGP version to use when communicating with
a neighbor.