Configure a Route Map for Route Redistribution..................................................................................................116Configure a Route Map for Route Tagging............................................................................................................ 117Continue Clause.........................................................................................................................................................117IP Fragment Handling..................................................................................................................................................... 117IP Fragments ACL Examples................................................................................................................................... 118Layer 4 ACL Rules Examples................................................................................................................................... 118Configure a Standard IP ACL.........................................................................................................................................119Configuring a Standard IP ACL Filter..................................................................................................................... 120Configure an Extended IP ACL......................................................................................................................................121Configuring Filters with a Sequence Number........................................................................................................121Configuring Filters Without a Sequence Number.................................................................................................124Configure Layer 2 and Layer 3 ACLs............................................................................................................................124Assign an IP ACL to an Interface..................................................................................................................................125Applying an IP ACL.........................................................................................................................................................125Counting ACL Hits....................................................................................................................................................126Configure Ingress ACLs................................................................................................................................................. 126Configure Egress ACLs.................................................................................................................................................. 127Applying Egress Layer 3 ACLs (Control-Plane).................................................................................................... 128IP Prefix Lists.................................................................................................................................................................. 128Implementation Information.................................................................................................................................... 129Configuration Task List for Prefix Lists.................................................................................................................. 129ACL Resequencing......................................................................................................................................................... 132Resequencing an ACL or Prefix List.......................................................................................................................133Route Maps.....................................................................................................................................................................134Implementation Information.................................................................................................................................... 134Flow-Based Monitoring Support for ACLs.................................................................................................................. 134Behavior of Flow-Based Monitoring.......................................................................................................................135Enabling Flow-Based Monitoring............................................................................................................................136Configuring IP Mirror Access Group............................................................................................................................ 136Sample Configuration............................................................................................................................................... 137Example of viewing IP mirror–access–group applied to an Interface................................................................1387 Bidirectional Forwarding Detection (BFD).................................................................................................. 139How BFD Works............................................................................................................................................................. 139BFD Packet Format..................................................................................................................................................140BFD Sessions............................................................................................................................................................. 141BFD Three-Way Handshake.................................................................................................................................... 142Session State Changes............................................................................................................................................ 144Important Points to Remember.................................................................................................................................... 144Configure BFD................................................................................................................................................................ 144Configure BFD for Physical Ports...........................................................................................................................145Configure BFD for Static Routes............................................................................................................................148Configure BFD for OSPF..........................................................................................................................................151Configure BFD for OSPFv3.....................................................................................................................................156Configure BFD for IS-IS...........................................................................................................................................158Configure BFD for BGP........................................................................................................................................... 1606 Contents
