Connectivity Guide

Table Of Contents
Enabling four-byte autonomous system numbers..............................................................................................176
Changing a BGP router ID........................................................................................................................................177
Configuring AS4 Number Representations.......................................................................................................... 177
Configuring a BGP peer............................................................................................................................................178
Example-Configuring BGP routing between peers............................................................................................ 179
BGP peer group..........................................................................................................................................................180
Advanced BGP configuration tasks.............................................................................................................................187
Route-refresh and Soft-reconfiguration.............................................................................................................. 187
Aggregating Routes...................................................................................................................................................189
Filtering BGP................................................................................................................................................................191
Configuring BGP Fast Fall-Over.............................................................................................................................196
Configuring Passive Peering................................................................................................................................... 198
Enabling Graceful Restart........................................................................................................................................198
Redistributing Routes............................................................................................................................................... 199
Enabling Additional Paths........................................................................................................................................200
Configuring IP Community Lists.............................................................................................................................201
Configuring an IP Extended Community List..................................................................................................... 202
Configure BGP attributes....................................................................................................................................... 203
Enabling Multipath.................................................................................................................................................... 206
Route Reflectors....................................................................................................................................................... 207
Enabling Route Flap Dampening............................................................................................................................208
Changing BGP keepalive and hold timers............................................................................................................ 210
Setting the extended timer...................................................................................................................................... 211
Enabling or disabling BGP neighbors..................................................................................................................... 211
Route Map Continue................................................................................................................................................. 212
Configuring BGP Confederations...........................................................................................................................213
Configuring a BGP VRF address family................................................................................................................ 213
Maintaining Existing AS Numbers During an AS Migration..............................................................................215
Allowing an AS Number to Appear in its Own AS Path.................................................................................... 215
Enabling MBGP Configurations.............................................................................................................................. 216
MBGP support for IPv6............................................................................................................................................217
Configuring IPv6 MBGP between peers.............................................................................................................. 217
Example-Configuring IPv4 and IPv6 neighbors.................................................................................................. 217
Configure IPv6 NH Automatically for IPv6 Prefix Advertised over IPv4 Neighbor................................... 219
BGP Regular Expression Optimization..................................................................................................................221
Debugging BGP.......................................................................................................................................................... 221
Chapter 10: Content Addressable Memory (CAM)......................................................................224
CAM Allocation................................................................................................................................................................ 224
Test CAM Usage............................................................................................................................................................. 226
View CAM Profiles..........................................................................................................................................................226
View CAM-ACL Settings...............................................................................................................................................227
View CAM Usage............................................................................................................................................................ 228
Configuring CAM Threshold and Silence Period..................................................................................................... 229
CAM Optimization.......................................................................................................................................................... 230
Troubleshoot CAM Profiling.........................................................................................................................................230
QoS CAM Region Limitation...................................................................................................................................230
Syslog Error When the Table is Full.......................................................................................................................231
Syslog Warning Upon 90 Percent Utilization of CAM...................................................................................... 231
Syslog Warning for Discrepancies Between Configured Extended Prefixes...............................................231
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