Users Guide
Configuring Filters with a Sequence Number.............................................................121
Configuring Filters Without a Sequence Number......................................................123
Configure Layer 2 and Layer 3 ACLs.................................................................................. 124
Assign an IP ACL to an Interface......................................................................................... 124
Applying an IP ACL................................................................................................................. 125
Counting ACL Hits............................................................................................................126
Configure Ingress ACLs.........................................................................................................126
Configure Egress ACLs.......................................................................................................... 127
Applying Egress Layer 3 ACLs (Control-Plane).......................................................... 128
IP Prefix Lists............................................................................................................................128
Implementation Information..........................................................................................129
Configuration Task List for Prefix Lists.........................................................................129
ACL Resequencing................................................................................................................. 133
Resequencing an ACL or Prefix List.............................................................................. 133
Route Maps.............................................................................................................................. 135
Implementation Information..........................................................................................135
Flow-Based Monitoring Support for ACLs........................................................................ 135
Behavior of Flow-Based Monitoring.............................................................................136
Enabling Flow-Based Monitoring.................................................................................. 137
7 Bidirectional Forwarding Detection (BFD).......................................................................139
How BFD Works......................................................................................................................139
BFD Packet Format...........................................................................................................141
BFD Sessions......................................................................................................................143
BFD Three-Way Handshake........................................................................................... 143
Session State Changes.....................................................................................................145
Important Points to Remember.......................................................................................... 145
Configure BFD.........................................................................................................................146
Configure BFD for Physical Ports..................................................................................146
Configure BFD for Static Routes................................................................................... 149
Configure BFD for OSPF..................................................................................................151
Configure BFD for OSPFv3............................................................................................. 154
Configure BFD for IS-IS...................................................................................................155
Configure BFD for BGP................................................................................................... 158
Configure BFD for VRRP................................................................................................. 165
Configuring Protocol Liveness...................................................................................... 168
Troubleshooting BFD.......................................................................................................168
8 Border Gateway Protocol IPv4 (BGPv4)...........................................................................170
Autonomous Systems (AS)....................................................................................................170
Sessions and Peers................................................................................................................. 173
Establish a Session............................................................................................................ 173
9.10(0.1)
6