Install Guide

Table Of Contents
Enabling four-byte autonomous system numbers............................................................................................. 180
Changing a BGP router ID........................................................................................................................................ 181
Configuring AS4 Number Representations.......................................................................................................... 181
Configuring a BGP peer............................................................................................................................................182
Example-Configuring BGP routing between peers............................................................................................183
BGP peer group..........................................................................................................................................................184
Advanced BGP configuration tasks............................................................................................................................. 191
Route-refresh and Soft-reconfiguration...............................................................................................................191
Aggregating Routes...................................................................................................................................................193
Filtering BGP...............................................................................................................................................................195
Configuring BGP Fast Fall-Over............................................................................................................................200
Configuring Passive Peering...................................................................................................................................202
Enabling Graceful Restart....................................................................................................................................... 202
Redistributing Routes...............................................................................................................................................203
Enabling Additional Paths........................................................................................................................................204
Configuring IP Community Lists............................................................................................................................205
Configuring an IP Extended Community List..................................................................................................... 206
Configure BGP attributes........................................................................................................................................207
Enabling Multipath.....................................................................................................................................................210
Route Reflectors.........................................................................................................................................................211
Enabling Route Flap Dampening.............................................................................................................................212
Changing BGP keepalive and hold timers............................................................................................................ 214
Setting the extended timer..................................................................................................................................... 215
Enabling or disabling BGP neighbors.....................................................................................................................215
Route Map Continue................................................................................................................................................. 216
Configuring BGP Confederations...........................................................................................................................217
Configuring a BGP VRF address family................................................................................................................ 217
Maintaining Existing AS Numbers During an AS Migration..............................................................................219
Allowing an AS Number to Appear in its Own AS Path.................................................................................... 219
Enabling MBGP Configurations............................................................................................................................. 220
MBGP support for IPv6............................................................................................................................................221
Configuring IPv6 MBGP between peers.............................................................................................................. 221
Example-Configuring IPv4 and IPv6 neighbors.................................................................................................. 221
Configure IPv6 NH Automatically for IPv6 Prefix Advertised over IPv4 Neighbor...................................224
BGP Regular Expression Optimization.................................................................................................................225
Debugging BGP......................................................................................................................................................... 225
Chapter 10: Content Addressable Memory (CAM)......................................................................228
CAM Allocation................................................................................................................................................................ 228
Test CAM Usage............................................................................................................................................................. 230
View CAM Profiles..........................................................................................................................................................230
View CAM-ACL Settings................................................................................................................................................231
View CAM Usage............................................................................................................................................................ 232
Configuring CAM Threshold and Silence Period..................................................................................................... 233
CAM Optimization...........................................................................................................................................................234
Troubleshoot CAM Profiling......................................................................................................................................... 234
QoS CAM Region Limitation...................................................................................................................................234
Syslog Error When the Table is Full......................................................................................................................235
Syslog Warning Upon 90 Percent Utilization of CAM......................................................................................235
Syslog Warning for Discrepancies Between Configured Extended Prefixes..............................................235
Contents
7