Users Guide

Configuring Filters Without a Sequence Number...................................................................................... 111
Configure Layer 2 and Layer 3 ACLs...................................................................................................................112
Assign an IP ACL to an Interface..........................................................................................................................112
Applying an IP ACL..................................................................................................................................................113
Counting ACL Hits............................................................................................................................................ 113
Configure Ingress ACLs......................................................................................................................................... 114
Configure Egress ACLs.......................................................................................................................................... 114
Applying Egress Layer 3 ACLs (Control-Plane)........................................................................................... 115
IP Prefix Lists............................................................................................................................................................ 115
Implementation Information.......................................................................................................................... 116
Configuration Task List for Prefix Lists......................................................................................................... 116
ACL Resequencing.................................................................................................................................................120
Resequencing an ACL or Prefix List..............................................................................................................120
Route Maps...............................................................................................................................................................121
Implementation Information.......................................................................................................................... 121
Important Points to Remember...........................................................................................................................122
Configuration Task List for Route Maps.......................................................................................................122
Configuring Match Routes..............................................................................................................................124
Configuring Set Conditions............................................................................................................................ 125
Configure a Route Map for Route Redistribution......................................................................................126
Configure a Route Map for Route Tagging................................................................................................. 127
Continue Clause................................................................................................................................................127
Logging of ACL Processes.................................................................................................................................... 127
Guidelines for Configuring ACL Logging.....................................................................................................128
Configuring ACL Logging............................................................................................................................... 129
Flow-Based Monitoring Support for ACLs........................................................................................................ 129
Behavior of Flow-Based Monitoring.............................................................................................................130
Enabling Flow-Based Monitoring.................................................................................................................. 131
8 Bidirectional Forwarding Detection (BFD)..................................................................................................... 133
How BFD Works......................................................................................................................................................133
BFD Packet Format...........................................................................................................................................134
BFD Sessions......................................................................................................................................................135
BFD Three-Way Handshake........................................................................................................................... 136
Session State Changes.....................................................................................................................................138
Important Points to Remember.......................................................................................................................... 138
Configure BFD.........................................................................................................................................................138
Configure BFD for Physical Ports..................................................................................................................139
Configure BFD for Static Routes................................................................................................................... 142
Configure BFD for OSPF................................................................................................................................. 144
Configure BFD for OSPFv3............................................................................................................................. 146
Configure BFD for IS-IS...................................................................................................................................148
Configure BFD for BGP................................................................................................................................... 150
Configure BFD for VRRP..................................................................................................................................157
Configuring Protocol Liveness.......................................................................................................................159
Troubleshooting BFD.......................................................................................................................................159
9.10(0.0)
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