Filter
Top Products
Configuring Filters Without a Sequence Number...................................................................... 118
Configure Layer 2 and Layer 3 ACLs.................................................................................................119
Assign an IP ACL to an Interface.......................................................................................................119
Applying an IP ACL............................................................................................................................120
Counting ACL Hits....................................................................................................................... 121
Configure Ingress ACLs..................................................................................................................... 121
Configure Egress ACLs......................................................................................................................122
Applying Egress Layer 3 ACLs (Control-Plane).......................................................................... 122
IP Prefix Lists......................................................................................................................................123
Implementation Information.......................................................................................................123
Configuration Task List for Prefix Lists....................................................................................... 123
ACL Resequencing............................................................................................................................ 127
Resequencing an ACL or Prefix List............................................................................................128
Route Maps........................................................................................................................................129
Implementation Information...................................................................................................... 130
Flow-Based Monitoring Support for ACLs.......................................................................................130
Behavior of Flow-Based Monitoring...........................................................................................130
Enabling Flow-Based Monitoring............................................................................................... 132
7 Bidirectional Forwarding Detection (BFD)...................................................134
How BFD Works................................................................................................................................ 134
BFD Packet Format......................................................................................................................135
BFD Sessions................................................................................................................................137
BFD Three-Way Handshake........................................................................................................ 137
Session State Changes................................................................................................................ 138
Important Points to Remember........................................................................................................139
Configure BFD...................................................................................................................................139
Configure BFD for Physical Ports............................................................................................... 140
Configure BFD for Static Routes.................................................................................................143
Configure BFD for OSPF............................................................................................................. 145
Configure BFD for OSPFv3......................................................................................................... 148
Configure BFD for IS-IS...............................................................................................................149
Configure BFD for BGP................................................................................................................151
Configure BFD for VRRP............................................................................................................. 158
Configuring Protocol Liveness....................................................................................................161
Troubleshooting BFD.................................................................................................................. 162
8 Border Gateway Protocol IPv4 (BGPv4)...................................................... 164
Autonomous Systems (AS)................................................................................................................164
Sessions and Peers............................................................................................................................166
Establish a Session.......................................................................................................................167
Route Reflectors................................................................................................................................168
6