Bgp Address Family Command Set - ADTRAN AOS Version R10.1.0 Command Reference Manual

Command Reference Guide
BGP A
DDRESS
In AOS firmware release 18.03.00, Multiple VPN routing and forwarding (VRF) Border Gateway Protocol
(BGP) functionality was incorporated into AOS. This release allows BGP configuration to occur on
different VRF instances, and changes the hierarchical structure of BGP within AOS as well as the
configuration steps necessary for BGP configuration. In addition, in AOS firmware release R10.1.0,
multiprotocol BGP and BGP for Internet Protocol version 6 (IPv6) were added.
The following are new features of BGP included with Multi-VRF BGP, multiprotocol BGP, and BGP for
IPv6.
Address families (AFs) are used in BGP to maintain a separation between Internet protocol types within a
VRF instance. With the advent of Multi-VRF BGP in 18.03.00, AOS implemented the use of AFs into the
BGP hierarchical structure. An AF is a configuration structure that can reside at the default VRF instance
and within a nondefault VRF instance. Creating an address family enables processing of that address
family within a VRF, and it provides a place for AF-specific configuration.
In addition to the use of AFs, Multi-VRF BGP also allows the recognition and configuration of VRF
instances specific to BGP functionality within the router. This allows the VRF constructs from the service
provider to be incorporated into the customer router.
Multi-VRF is an application of the typical BGP functionality. As the name suggests, Multi-VRF BGP
extends traditional service provider multi-VRF functionality of BGP to the customer edge router. This type
of feature is typically used in Layer 3 virtual private network (VPN) applications where the VPN is
extended to the customer device using multi-VRF. Multi-VRF BGP allows the customer edge router to
dynamically exchange customer VPN routers to and through the provider's VPN cloud, thus eliminating
the reliance on the provider to manage static routes. Multi-VRF takes place on the link between the service
provider's routers and the customer edge equipment.
In Multi-VRF BGP the concepts of the address family and VRF instances are incorporated into the BGP
configuration structure. VRF instances are in themselves not tied to a specific protocol, and therefore,
control of multiple protocols within a single VRF is accomplished using an AF. Multi-VRF BGP also uses
the concepts of AFs to provide specific BGP configuration to a single BGP policy, and maintain control
over multiple BGP policies within a single AF.
In Multi-VRF BGP, the hierarchical structure of BGP configuration is as follows:
Global BGP settings (affecting all of BGP for this router)
!
VRF BGP settings (affecting only the default VRF)
Neighbor #1 Definition
Neighbor #1 common settings (common to all peering with neighbor #1)
exit
!
Address Family for the default VRF
AF BGP settings (affecting only this AF)
Neighbor #1 Reference
60000CRG0-35E
F C
AMILY OMMAND
Copyright © 2012 ADTRAN, Inc.

BGP Address Family Command Set

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