Configure a Route Map for Route Tagging................................................................................................................108Continue Clause........................................................................................................................................................108Logging of ACL Processes..............................................................................................................................................109Guidelines for Configuring ACL Logging.......................................................................................................................... 110Configuring ACL Logging.................................................................................................................................................110Flow-Based Monitoring Support for ACLs........................................................................................................................ 111Behavior of Flow-Based Monitoring............................................................................................................................111Enabling Flow-Based Monitoring..................................................................................................................................... 1127 Access Control List (ACL) VLAN Groups and Content Addressable Memory (CAM).....114Optimizing CAM Utilization During the Attachment of ACLs to VLANs........................................................................... 114Guidelines for Configuring ACL VLAN groups..................................................................................................................115Configuring ACL VLAN Groups and Configuring FP Blocks for VLAN Parameters...........................................................116Configuring ACL VLAN Groups..................................................................................................................................116Configuring FP Blocks for VLAN Parameters.............................................................................................................117Viewing CAM Usage........................................................................................................................................................ 117Allocating FP Blocks for VLAN Processes........................................................................................................................1188 Bidirectional Forwarding Detection (BFD)....................................................................120How BFD Works............................................................................................................................................................. 120BFD Packet Format................................................................................................................................................... 121BFD Sessions............................................................................................................................................................122BFD Three-Way Handshake...................................................................................................................................... 123Session State Changes............................................................................................................................................. 125Important Points to Remember.......................................................................................................................................125Configure BFD................................................................................................................................................................ 125Configure BFD for Physical Ports..............................................................................................................................126Configure BFD for Static Routes...............................................................................................................................129Configure BFD for OSPF.......................................................................................................................................... 130Configure BFD for OSPFv3.......................................................................................................................................132Configure BFD for IS-IS............................................................................................................................................ 134Configure BFD for BGP............................................................................................................................................ 136Configure BFD for VRRP.......................................................................................................................................... 142Configuring Protocol Liveness...................................................................................................................................145Troubleshooting BFD.................................................................................................................................................1459 Border Gateway Protocol IPv4 (BGPv4)...................................................................... 147Autonomous Systems (AS)............................................................................................................................................. 147Sessions and Peers......................................................................................................................................................... 149Establish a Session....................................................................................................................................................149Route Reflectors.............................................................................................................................................................150BGP Attributes................................................................................................................................................................ 151Best Path Selection Criteria.......................................................................................................................................151Weight...................................................................................................................................................................... 153Local Preference.......................................................................................................................................................153Multi-Exit Discriminators (MEDs)..............................................................................................................................1546
