Specifications

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Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)
OL-25782-02
Chapter 5 Configuring Basic BGP
Default Settings
switch(config)# router bgp 64497
switch(config-router)# vrf vrf_A
switch(config-router-vrf)# neighbor 192.0.2.1
switch(config-router-vrf-neighbor)#
Neighbor Address Family Configuration Mode
An address family configuration submode inside the neighbor configuration submode is available for
entering address family-specific neighbor configuration and enabling the address family for the
neighbor. Use this mode for advanced features such as limiting the number of prefixes allowed for this
neighbor and removing private AS numbers for eBGP.
This example shows how to enter neighbor address family configuration mode:
switch(config)# router bgp 64496
switch(config-router# neighbor 192.0.2.1
switch(config-router-neighbor)# address-family ipv4 unicast
switch(config-router-neighbor-af)#
This example shows how to enter VRF neighbor address family configuration mode:
switch(config)# router bgp 64497
switch(config-router)# vrf vrf_A
switch(config-router-vrf)# neighbor 209.165.201.1
switch(config-router-vrf-neighbor)# address-family ipv4 unicast
switch(config-router-vrf-neighbor-af)#
Default Settings
Table 5-2 lists the default settings for BGP parameters.
Configuring Basic BGP
To configure a basic BGP, you need to enable BGP and configure a BGP peer. Configuring a basic BGP
network consists of a few required tasks and many optional tasks. You must configure a BGP routing
process and BGP peers.
This section includes the following topics:
• Enabling the BGP Feature, page 5-11
• Creating a BGP Instance, page 5-12
• Restarting a BGP Instance, page 5-13
• Shutting Down BGP, page 5-14
Table 5-2 Default BGP Parameters
Parameters Default
BGP feature Disabled
keep alive interval 60 seconds
hold timer 180 seconds