Cisco BGP Best Path Selection

Cisco BGP Best Path Selection

• Topology
  
  
  
  
• Configuration Settings Overview
  
  
  1. BGP Configuration

     AS65000 : R1, R2, R3
     AS65001 : R4, R5
     
     R2 BGP router-id : 10.0.0.2
     R3 BGP router-id : 10.0.0.3
     
     eBGP Peer :  R2 - R4
                  R3 - R4
     

  2. BGP Best Path Selection Algorithm

     1.  Weight Attribute           ---> same weight value of 0
     2.  Local Preference Attribute ---> same local preference value of 100
     3.  Locally Generated          ---> not generated locally
     4.  AS_Path Attribute          ---> same AS_PATH length of 65001
     5.  Origin Attribute           ---> same origin value of i
     6.  MED Attribute              ---> same med value of 0
     7.  eBGP or iBGP               ---> iBGP only
     8.  IGP metric                 ---> same metric(next-hop 10.0.0.2(metric:11)/10.0.0.3(metric:11))
     9.  External Paths             ---> iBGP not eBGP
     10. BGP Router ID              ---> R1 192.168.7.0/24 Route
     

• Dynagen Config File / Router Config

  (1)  Dynagen .net file
  
  (2)  R1
  
  (3)  R2
  
  (4)  R3
  
  (5)  R4
  
  (6)  R5
  

• show command

  sh bgp ipv4 unicast
  sh ip route
  
  (1)  R1