Users Guide

Conguration Information............................................................................................................................................... 180
BGP Conguration..........................................................................................................................................................180
Enabling BGP.............................................................................................................................................................181
Conguring AS4 Number Representations................................................................................................................184
Conguring Peer Groups.......................................................................................................................................... 185
Conguring BGP Fast Fall-Over................................................................................................................................188
Conguring Passive Peering..................................................................................................................................... 190
Maintaining Existing AS Numbers During an AS Migration........................................................................................ 190
Allowing an AS Number to Appear in its Own AS Path.............................................................................................. 191
Enabling Graceful Restart......................................................................................................................................... 192
Enabling Neighbor Graceful Restart..........................................................................................................................193
Filtering on an AS-Path Attribute.............................................................................................................................. 193
Regular Expressions as Filters................................................................................................................................... 194
Redistributing Routes............................................................................................................................................... 196
Enabling Additional Paths..........................................................................................................................................196
Conguring IP Community Lists................................................................................................................................ 197
Conguring an IP Extended Community List.............................................................................................................198
Filtering Routes with Community Lists......................................................................................................................199
Manipulating the COMMUNITY Attribute................................................................................................................. 199
Changing MED Attributes......................................................................................................................................... 201
Changing the LOCAL_PREFERENCE Attribute........................................................................................................201
Changing the NEXT_HOP Attribute.........................................................................................................................202
Changing the WEIGHT Attribute..............................................................................................................................202
Enabling Multipath................................................................................................................................................... 202
Filtering BGP Routes................................................................................................................................................203
Filtering BGP Routes Using Route Maps..................................................................................................................204
Filtering BGP Routes Using AS-PATH Information................................................................................................... 205
Conguring BGP Route Reectors...........................................................................................................................205
Aggregating Routes................................................................................................................................................. 206
Conguring BGP Confederations............................................................................................................................. 206
Enabling Route Flap Dampening............................................................................................................................... 207
Changing BGP Timers..............................................................................................................................................209
Enabling BGP Neighbor Soft-Reconguration..........................................................................................................209
Route Map Continue.................................................................................................................................................210
Enabling MBGP Congurations........................................................................................................................................211
BGP Regular Expression Optimization.............................................................................................................................212
Debugging BGP.............................................................................................................................................................. 212
Storing Last and Bad PDUs.......................................................................................................................................213
Capturing PDUs........................................................................................................................................................214
PDU Counters...........................................................................................................................................................215
Sample Congurations....................................................................................................................................................215
11 Content Addressable Memory (CAM)......................................................................... 221
CAM Allocation............................................................................................................................................................... 221
Test CAM Usage............................................................................................................................................................ 223
View CAM Proles......................................................................................................................................................... 223
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