Troubleshooting guide

Configuration Command Summary

It is important to note that BGP sessions must be cleared for BGP policy changes, such as

alterations to the prefix list filters, to take effect. Use the clear ip bgp command to clear

BGP neighbors. Typically, soft resets should be used because hard resets can disrupt the

network. Refer to Clear IP BGP on page 74 for detailed information on how to properly use

this command.

Table 4. Basic BGP Configuration Steps

Command Description

Step 1 (config)#router bgp <AS number> Enables BGP and specifies the local AS.

Step 2 (config-bgp)#network <ipv4 address>

mask <subnet mask>

Specifies the local IPv4 networks that

remote sites should be able to access.

Step 3 (config-bgp)#neighbor <ipv4 address> Configures at least one BGP neighbor.

(config-bgp-neighbor)#remote-as <value> Specifies the AS to which this neighbor

belongs. Range is 1 to 4294967295.

Step 4 (config-bgp-neighbor)#do write Saves the configuration

Refer to Basic BGP Configuration Using the CLI on page 9 for detailed information on the

commands used in the table above.