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Conguring Peer Groups...........................................................................................................................................184

Conguring BGP Fast Fall-Over................................................................................................................................186

Conguring Passive Peering..................................................................................................................................... 188

Maintaining Existing AS Numbers During an AS Migration........................................................................................ 188

Allowing an AS Number to Appear in its Own AS Path..............................................................................................189

Enabling Graceful Restart......................................................................................................................................... 190

Enabling Neighbor Graceful Restart...........................................................................................................................191

Filtering on an AS-Path Attribute...............................................................................................................................191

Regular Expressions as Filters................................................................................................................................... 193

Redistributing Routes................................................................................................................................................194

Enabling Additional Paths..........................................................................................................................................195

Conguring IP Community Lists................................................................................................................................195

Conguring an IP Extended Community List.............................................................................................................196

Filtering Routes with Community Lists...................................................................................................................... 197

Manipulating the COMMUNITY Attribute................................................................................................................. 197

Changing MED Attributes.........................................................................................................................................199

Changing the LOCAL_PREFERENCE Attribute........................................................................................................199

Changing the NEXT_HOP Attribute.........................................................................................................................200

Changing the WEIGHT Attribute..............................................................................................................................200

Enabling Multipath.................................................................................................................................................... 201

Filtering BGP Routes.................................................................................................................................................201

Filtering BGP Routes Using Route Maps..................................................................................................................202

Filtering BGP Routes Using AS-PATH Information................................................................................................... 203

Conguring BGP Route Reectors...........................................................................................................................203

Aggregating Routes................................................................................................................................................. 204

Conguring BGP Confederations............................................................................................................................. 204

Enabling Route Flap Dampening...............................................................................................................................205

Changing BGP Timers.............................................................................................................................................. 207

Enabling BGP Neighbor Soft-Reconguration..........................................................................................................208

Route Map Continue................................................................................................................................................209

Enabling MBGP Congurations......................................................................................................................................209

BGP Regular Expression Optimization............................................................................................................................ 210

Debugging BGP.............................................................................................................................................................. 210

Storing Last and Bad PDUs....................................................................................................................................... 211

Capturing PDUs........................................................................................................................................................212

PDU Counters...........................................................................................................................................................213

Sample Congurations....................................................................................................................................................213

11 Content Addressable Memory (CAM).........................................................................220

CAM Allocation.............................................................................................................................................................. 220

Test CAM Usage............................................................................................................................................................ 222

View CAM-ACL Settings................................................................................................................................................222

View CAM Usage........................................................................................................................................................... 224

CAM Optimization..........................................................................................................................................................224

Troubleshoot CAM Proling............................................................................................................................................224

CAM Prole Mismatches..........................................................................................................................................224