Policy Based Routing

• PBR intercepts packets before regular routing
• PBR overwrites the router’s natural destination
• PBR is tied to route-maps
  • Define the match criteria
  • Define the action for the packets
•  Packet forwarding
  • Outgoing interface
  • IP Next-Hop

Configuration

• Define an ACL
• Configure route-map
  •  Match the ACL
  • Apply set paramets
    • Set ip next-hop 10.10.10.10
    • set ip default next-hop 10.10.10.10    (default routing first, else if nexthop)
    • set interface fa0/0
    • set default interface fa0/0      (default routing first, else if nexthop)
• Apply PBR to incoming interface
• ip policy route-map
  •  ingress feature on interface
• IP precedence
  • set ip precedence (value)
• ToS
  • set ip tos (value)