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Allowing an AS Number to Appear in its Own AS Path...................................................................................... 202
Enabling Neighbor Graceful Restart......................................................................................................................203
Filtering on an AS-Path Attribute...........................................................................................................................203
Regular Expressions as Filters................................................................................................................................205
Redistributing Routes..............................................................................................................................................206
Enabling Additional Paths........................................................................................................................................207
Conguring IP Community Lists.............................................................................................................................207
Conguring an IP Extended Community List....................................................................................................... 208
Filtering Routes with Community Lists................................................................................................................. 209
Manipulating the COMMUNITY Attribute.............................................................................................................210
Changing MED Attributes........................................................................................................................................ 211
Changing the LOCAL_PREFERENCE Attribute................................................................................................... 211
Conguring the local System or a Dierent System to be the Next Hop for BGP-Learned Routes............. 212
Changing the WEIGHT Attribute............................................................................................................................213
Enabling Multipath....................................................................................................................................................213
Filtering BGP Routes................................................................................................................................................213
Filtering BGP Routes Using Route Maps...............................................................................................................215
Filtering BGP Routes Using AS-PATH Information.............................................................................................. 215
Conguring BGP Route Reectors........................................................................................................................ 216
Aggregating Routes..................................................................................................................................................217
Conguring BGP Confederations........................................................................................................................... 217
Enabling Route Flap Dampening.............................................................................................................................218
Changing BGP Timers.............................................................................................................................................220
Enabling BGP Neighbor Soft-Reconguration.....................................................................................................220
Enabling or disabling BGP neighbors......................................................................................................................221
Route Map Continue............................................................................................................................................... 223
Enabling MBGP Congurations....................................................................................................................................223
Congure IPv6 NH Automatically for IPv6 Prex Advertised over IPv4 Neighbor......................................... 224
BGP Regular Expression Optimization........................................................................................................................ 224
Debugging BGP..............................................................................................................................................................224
Storing Last and Bad PDUs....................................................................................................................................225
Capturing PDUs....................................................................................................................................................... 226
PDU Counters.......................................................................................................................................................... 227
Sample Congurations.................................................................................................................................................. 227
9 Content Addressable Memory (CAM)........................................................................................................ 236
CAM Allocation...............................................................................................................................................................236
Test CAM Usage............................................................................................................................................................238
View CAM-ACL Settings.............................................................................................................................................. 238
View CAM Usage...........................................................................................................................................................239
Conguring CAM Threshold and Silence Period........................................................................................................239
Setting CAM Threshold and Silence Period......................................................................................................... 240
Return to the Default CAM Conguration...................................................................................................................241
CAM Optimization.......................................................................................................................................................... 241
Applications for CAM Proling...................................................................................................................................... 241
LAG HashingLAG Hashing Based on Bidirectional Flow......................................................................................241
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