Multiprotocol Bgp; Virtualization Support; Licensing Requirements For Advanced Bgp; Prerequisites For Bgp - Cisco Nexus 3000 Series Configuration Manual

Chapter 6 Configuring Advanced BGP
S e n d d o c u m e n t c o m m e n t s t o n e x u s 3 k - d o c f e e d b a c k @ c i s c o . c o m

Multiprotocol BGP

BGP on Cisco NX-OS supports multiple address families. Multiprotocol BGP (MP-BGP) carries
different sets of routes depending on the address family. For example, BGP can carry one set of routes
for IPv4 unicast routing, and one set of routes for IPv4 multicast routing. You can use MP-BGP for
reverse-path forwarding (RPF) checks in IP multicast networks.
Because Multicast BGP does not propagate multicast state information, you need a multicast protocol,
Note
such as Protocol Independent Multicast (PIM).
Use the router address-family and neighbor address-family configuration modes to support
multiprotocol BGP configurations. MP-BGP maintains separate RIBs for each configured address
family, such as a unicast RIB and a multicast RIB for BGP.
A multiprotocol BGP network is backward compatible but BGP peers that do not support multiprotocol
extensions cannot forward routing information, such as address family identifier information, that the
multiprotocol extensions carry.

Virtualization Support

Cisco NX-OS supports multiple instances of BGP that run on the same system. BGP supports Virtual
Routing and Forwarding instances (VRFs).
By default, Cisco NX-OS places you in the default VRF unless you specifically configure another VRF.
See

Licensing Requirements for Advanced BGP

The following table shows the licensing requirements for this feature:
Product License Requirement
Cisco NX-OS BGP requires an LAN Enterprise Services license. For a complete explanation of the Cisco NX-OS licensing
scheme and how to obtain and apply licenses, see the Cisco NX-OS Licensing Guide.
Make sure the LAN Base Services license is installed on the switch to enable Layer 3 interfaces.
Note

Prerequisites for BGP

BGP has the following prerequisites:
•
•
•
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Chapter 9, "Configuring Layer 3 Virtualization."
You must enable the BGP feature (see the
You should have a valid router ID configured on the system.
You must have an AS number, either assigned by a Regional Internet Registry (RIR) or locally
administered.
You must have reachability (such as an interior gateway protocol (IGP), a static route, or a direct
connection) to the peer that you are trying to make a neighbor relationship with.
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, NX-OS Release 5.0(3)U1(1)
Licensing Requirements for Advanced BGP
"Enabling the BGP Feature" section on page 5-11).
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