Concept Guide

Enabling Graceful Restart........................................................................................................................................214
Filtering on an AS-Path Attribute........................................................................................................................... 215
Regular Expressions as Filters.................................................................................................................................216
Redistributing Routes...............................................................................................................................................217
Enabling Additional Paths........................................................................................................................................ 218
Conguring IP Community Lists............................................................................................................................. 219
Conguring an IP Extended Community List....................................................................................................... 220
Filtering Routes with Community Lists.................................................................................................................. 221
Manipulating the COMMUNITY Attribute............................................................................................................ 222
Changing MED Attributes.......................................................................................................................................224
Changing the LOCAL_PREFERENCE Attribute..................................................................................................224
Conguring the local System or a Dierent System to be the Next Hop for BGP-Learned Routes............ 225
Changing the WEIGHT Attribute...........................................................................................................................225
Enabling Multipath...................................................................................................................................................226
Route Reectors......................................................................................................................................................226
Conguring BGP Confederations.......................................................................................................................... 228
Enabling Route Flap Dampening............................................................................................................................ 228
Changing BGP keepalive and hold timers.............................................................................................................230
Setting the extended timer..................................................................................................................................... 231
Enabling or disabling BGP neighbors.....................................................................................................................232
Route Map Continue............................................................................................................................................... 233
Enabling MBGP Congurations....................................................................................................................................234
MBGP support for IPv6................................................................................................................................................234
Conguring IPv6 MBGP between peers.....................................................................................................................234
Example-Conguring IPv4 and IPv6 neighbors......................................................................................................... 235
Congure IPv6 NH Automatically for IPv6 Prex Advertised over IPv4 Neighbor................................................237
BGP Regular Expression Optimization........................................................................................................................239
Debugging BGP............................................................................................................................................................. 239
Storing Last and Bad PDUs....................................................................................................................................240
Capturing PDUs........................................................................................................................................................241
PDU Counters.......................................................................................................................................................... 242
10 Content Addressable Memory (CAM).......................................................................................................243
CAM Allocation...............................................................................................................................................................243
Test CAM Usage............................................................................................................................................................245
View CAM Proles.........................................................................................................................................................245
View CAM-ACL Settings.............................................................................................................................................. 246
View CAM Usage........................................................................................................................................................... 247
Conguring CAM Threshold and Silence Period........................................................................................................248
Setting CAM Threshold and Silence Period......................................................................................................... 248
CAM Optimization......................................................................................................................................................... 249
Troubleshoot CAM Proling..........................................................................................................................................249
QoS CAM Region Limitation...................................................................................................................................249
Syslog Error When the Table is Full....................................................................................................................... 250
Syslog Warning Upon 90 Percent Utilization of CAM.........................................................................................250
Syslog Warning for Discrepancies Between Congured Extended Prexes....................................................250
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