Guidelines And Limitations For Bgp; Cli Configuration Modes; Global Configuration Mode; Address Family Configuration Mode - Cisco Nexus 3000 Series Configuration Manual

Guidelines and Limitations for 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
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Guidelines and Limitations for BGP

BGP has the following configuration guidelines and limitations:
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CLI Configuration Modes

The following sections describe how to enter each of the CLI configuration modes for BGP. From a
mode, you can enter the ? command to display the commands available in that mode.
This section includes the following topics:
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Global Configuration Mode

Use global configuration mode to create a BGP process and configure advanced features such as AS
confederation and route dampening. For more information, see
BGP."
This example shows how to enter router configuration mode:
switch# configuration
switch(config)# router bgp 64496
switch(config-router)#
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, NX-OS Release 5.0(3)U1(1)
5-8
You must configure at least one IGP that is capable of recursive next-hop resolution.
You must configure an address family under a neighbor for the BGP session establishment.
The dynamic AS number prefix peer configuration the overrides individual AS number
configuration inherited from a BGP template.
If you configure a dynamic AS number for prefix peers in an AS confederation, BGP establishes
sessions with only the AS numbers in the local confederation.
BGP sessions created through a dynamic AS number prefix peer ignore any configured eBGP
multihop time-to-live (TTL) value or a disabled check for directly connected peers.
Configure a router ID for BGP to avoid automatic router ID changes and session flaps.
Use the maximum-prefix configuration option per peer to restrict the number of routes received and
system resources used.
Configure the update-source to establish a session with BGP/eBGP multihop sessions.
Specify a BGP policy if you configure redistribution.
Define the BGP router ID within a VRF.
If you decrease the keepalive and hold timer values, you might experience BGP session flaps.
If you configure VRFs, enter the desired VRF (see
Global Configuration Mode, page 5-8
Address Family Configuration Mode, page 5-9
Neighbor Configuration Mode, page 5-9
Neighbor Address Family Configuration Mode, page 5-10
Chapter 5
Chapter 9, "Configuring Layer 3
Chapter 6, "Configuring Advanced

Configuring Basic BGP

Virtualization").