BGP Basic Configuration Commands

BGP Basic Configuration Commands

 

1. Enable BGP
               Activates BGP on the device with a specified Autonomous System number.

      Command: router bgp <AS-number>

2. Configure BGP Router ID
            Sets a unique identifier for the BGP router, usually an IP address to ensure consistent identification.
        Command: router-id <router-id>

3. Configure BGP Neighbor
               Defines a BGP neighbor by specifying its IP address and AS number.

  •   Command for Neighbor Configuration:

neighbor <IP-address>

remote-as <AS-number>

  • Command to Disable a Neighbor:

no neighbor <IP-address>

4. Set BGP Keep-alive and Hold Time
            Configures the BGP hold time to detect when a neighbor becomes unreachable.
  Command:

neighbor <IP-address>

timers <keepalive> <hold-time>

5. BGP Maximum Path Configuration
            Sets the maximum number of parallel paths that BGP should consider for load balancing.
        Command:

maximum-paths <number>

6. Clear BGP Sessions
            Clears or resets BGP sessions, useful for applying new configurations immediately.

  • Command to Clear All BGP Sessions

clear bgp all

  • Command to Clear Specific Neighbor Session

clear bgp  all <neighbor-IP>

7. Display BGP Information
            Shows bgp information for all address families.
  Command:

            show bgp all   

8. Display BGP Route Information
            Displays the BGP routing table with details of routes learned through BGP.
  Command:

show bgp ipv4

show bgp ipv6

9. BGP Add Path Configuration
            Add Path allows BGP to advertise multiple paths to a destination.

·               Command to Advertise All Paths:

                  addpath-tx-all-paths

This command enables BGP to advertise all paths to a neighbor.

·               Command to Advertise Best Path Per AS:

                  addpath-tx-bestpath-per-as

This command configures BGP to advertise only the best path per AS to a neighbor.

10. BGP Address Family Configuration
Defines the address families (IPv4, IPv6) for BGP.

  • Configure IPv4 Unicast Address Family
    Command:

address-family ipv4 unicast

  • Configure IPv6 Unicast Address Family
    Command:

address-family ipv6 unicast 



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