Concept Guide

Allowing an AS Number to Appear in its Own AS Path........................................................................................211
Enabling Graceful Restart........................................................................................................................................212
Filtering on an AS-Path Attribute........................................................................................................................... 213
Regular Expressions as Filters.................................................................................................................................214
Redistributing Routes...............................................................................................................................................215
Enabling Additional Paths........................................................................................................................................ 216
Conguring IP Community Lists............................................................................................................................. 216
Conguring an IP Extended Community List........................................................................................................ 217
Filtering Routes with Community Lists..................................................................................................................218
Manipulating the COMMUNITY Attribute.............................................................................................................219
Changing MED Attributes.......................................................................................................................................220
Changing the LOCAL_PREFERENCE Attribute...................................................................................................221
Conguring the local System or a Dierent System to be the Next Hop for BGP-Learned Routes............. 221
Changing the WEIGHT Attribute...........................................................................................................................222
Enabling Multipath...................................................................................................................................................222
Route Reectors......................................................................................................................................................223
Conguring BGP Confederations.......................................................................................................................... 224
Enabling Route Flap Dampening............................................................................................................................ 224
Changing BGP Timers............................................................................................................................................. 227
Setting the extended timer.....................................................................................................................................227
Enabling or disabling BGP neighbors.....................................................................................................................228
Route Map Continue............................................................................................................................................... 229
Enabling MBGP Congurations................................................................................................................................... 230
MBGP support for IPv6................................................................................................................................................230
Conguring IPv6 MBGP between peers.................................................................................................................... 230
Example-Conguring IPv4 and IPv6 neighbors.......................................................................................................... 231
Congure IPv6 NH Automatically for IPv6 Prex Advertised over IPv4 Neighbor............................................... 233
BGP Regular Expression Optimization........................................................................................................................235
Debugging BGP............................................................................................................................................................. 235
Storing Last and Bad PDUs....................................................................................................................................236
Capturing PDUs....................................................................................................................................................... 237
PDU Counters.......................................................................................................................................................... 238
10 Content Addressable Memory (CAM).......................................................................................................239
CAM Allocation...............................................................................................................................................................239
Test CAM Usage.............................................................................................................................................................241
View CAM-ACL Settings............................................................................................................................................... 241
View CAM Usage...........................................................................................................................................................243
Conguring CAM Threshold and Silence Period........................................................................................................243
Setting CAM Threshold and Silence Period..........................................................................................................243
CAM Optimization......................................................................................................................................................... 244
Troubleshoot CAM Proling..........................................................................................................................................245
CAM Prole Mismatches........................................................................................................................................ 245
QoS CAM Region Limitation...................................................................................................................................245
11 Control Plane Policing (CoPP).................................................................................................................. 246
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