Which three BGP configuration groupings are supported on Cisco IOS XR Software? (Choose three.)

A.
peer-group

B.
af-group

C.
bgp-group

D.
session-group

E.
neighbor-group

F.
as-group

Explanation:
•Commands relating to a peer group found in Cisco IOS Release 12.2 have been removed from Cisco
IOS XR software. Instead, the af-group, session-group, and neighbor-group configuration commands
are added to support the neighbor in Cisco IOS XR software:
–The af-group command is used to group address family-specific neighbor commands within an IPv4
or IPv6 address family. Neighbors that have the same address family configuration are able to use
the address family group name for their address family-specific configuration. A neighbor inherits
the configuration from an address family group by way of the use command. If a neighbor is
configured to use an address family group, the neighbor will (by default) inherit the entire
configuration from the address family group. However, a neighbor will not inherit all of the
configuration from the address family group if items are explicitly configured for the neighbor.
–The session-group command allows you to create a session group from which neighbors can inherit
address family-independent configuration. A neighbor inherits the configuration from a session
group by way of the use command. If a neighbor is configured to use a session group, the neighbor
(by default) inherits the session group’s entire configuration. A neighbor does not inherit all the
configuration from a session group if a configuration is done directly on that neighbor.
–The neighbor-group command helps you apply the same configuration to one or more neighbors.
Neighbor groups can include session groups and address family groups. This additional flexibility can
create a complete configuration for a neighbor. Once a neighbor group is configured, each neighbor
can inherit the configuration through the use command. If a neighbor is configured to use a neighbor
group, the neighbor (by default) inherits the neighbor group’s entire BGP configuration.
–However, a neighbor will not inherit all of the configuration from the neighbor group if items are
explicitly configured for the neighbor. In addition, some part of the neighbor group’s configuration
could be hidden if a session group or address family group was also being used.