Administrator Guide

Prerequisite for configuring a BGP network....................................................................................................... 182
Restrictions................................................................................................................................................................. 182
Enabling BGP.............................................................................................................................................................. 182
Enabling four-byte autonomous system numbers............................................................................................. 184
Changing a BGP router ID....................................................................................................................................... 185
Configuring AS4 Number Representations..........................................................................................................185
Configuring a BGP peer............................................................................................................................................186
Example-Configuring BGP routing between peers............................................................................................ 187
BGP peer group..........................................................................................................................................................188
Advanced BGP configuration tasks.............................................................................................................................195
Route-refresh and Soft-reconfiguration..............................................................................................................195
Aggregating Routes...................................................................................................................................................197
Filtering BGP...............................................................................................................................................................199
Configuring BGP Fast Fall-Over............................................................................................................................204
Configuring Passive Peering...................................................................................................................................206
Enabling Graceful Restart....................................................................................................................................... 207
Redistributing Routes...............................................................................................................................................208
Redistributing iBGP Routes into IGP....................................................................................................................208
Enabling Additional Paths......................................................................................................................................... 211
Configuring IP Community Lists..............................................................................................................................211
Configuring an IP Extended Community List...................................................................................................... 212
Configure BGP attributes........................................................................................................................................ 213
Enabling Multipath..................................................................................................................................................... 217
Route Reflectors........................................................................................................................................................ 217
Enabling Route Flap Dampening.............................................................................................................................219
Changing BGP keepalive and hold timers............................................................................................................ 221
Setting the extended timer..................................................................................................................................... 221
Enabling or disabling BGP neighbors.................................................................................................................... 222
Route Map Continue................................................................................................................................................ 223
Configuring BGP Confederations..........................................................................................................................224
Configuring a BGP VRF address family............................................................................................................... 224
Maintaining Existing AS Numbers During an AS Migration.............................................................................225
Allowing an AS Number to Appear in its Own AS Path................................................................................... 226
Enabling MBGP Configurations..............................................................................................................................227
MBGP support for IPv6........................................................................................................................................... 227
Configuring IPv6 MBGP between peers..............................................................................................................227
Example-Configuring IPv4 and IPv6 neighbors..................................................................................................228
Configure IPv6 NH Automatically for IPv6 Prefix Advertised over IPv4 Neighbor.................................. 230
BGP Regular Expression Optimization................................................................................................................. 232
Debugging BGP..........................................................................................................................................................232
Chapter 10: Content Addressable Memory (CAM)......................................................................234
CAM Allocation................................................................................................................................................................ 234
Test CAM Usage............................................................................................................................................................. 236
View CAM-ACL Settings...............................................................................................................................................236
View CAM Usage............................................................................................................................................................ 238
Configuring CAM Threshold and Silence Period..................................................................................................... 238
CAM Optimization...........................................................................................................................................................240
Troubleshoot CAM Profiling.........................................................................................................................................240
QoS CAM Region Limitation...................................................................................................................................240
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