Users Guide

Configuring Match Routes..............................................................................................157

Configuring Set Conditions............................................................................................159

Configure a Route Map for Route Redistribution......................................................160

Configure a Route Map for Route Tagging................................................................ 160

Continue Clause................................................................................................................161

Configuring a UDF ACL......................................................................................................... 161

Hot-Lock Behavior.................................................................................................................163

7 Bidirectional Forwarding Detection (BFD).......................................................................164

How BFD Works......................................................................................................................164

BFD Packet Format...........................................................................................................166

BFD Sessions......................................................................................................................168

BFD Three-Way Handshake...........................................................................................168

Session State Changes.....................................................................................................170

Important Points to Remember.......................................................................................... 170

Configure BFD......................................................................................................................... 171

Configure BFD for Static Routes....................................................................................171

Configure BFD for OSPF..................................................................................................173

Configure BFD for OSPFv3............................................................................................. 176

Configure BFD for IS-IS................................................................................................... 177

Configure BFD for BGP................................................................................................... 180

Configure BFD for VRRP..................................................................................................187

Configuring Protocol Liveness...................................................................................... 190

8 Border Gateway Protocol IPv4 (BGPv4)...........................................................................191

Autonomous Systems (AS)....................................................................................................191

Sessions and Peers.................................................................................................................194

Establish a Session............................................................................................................194

Route Reflectors..................................................................................................................... 195

Communities.....................................................................................................................196

BGP Attributes.........................................................................................................................196

Best Path Selection Criteria............................................................................................196

Weight.................................................................................................................................198

Local Preference...............................................................................................................199

Multi-Exit Discriminators (MEDs)...................................................................................199

Origin..................................................................................................................................200

AS Path................................................................................................................................201

Next Hop............................................................................................................................ 201

Multiprotocol BGP................................................................................................................. 202

Implement BGP .....................................................................................................................202

Additional Path (Add-Path) Support.............................................................................202

Advertise IGP Cost as MED for Redistributed Routes...............................................202

Version 9.10(0.0)