Deployment Guide

Table Of Contents
Enabling four-byte autonomous system numbers..............................................................................................179
Changing a BGP router ID....................................................................................................................................... 180
Configuring AS4 Number Representations..........................................................................................................180
Configuring a BGP peer............................................................................................................................................ 181
Example-Configuring BGP routing between peers............................................................................................182
BGP peer group..........................................................................................................................................................183
Advanced BGP configuration tasks............................................................................................................................ 190
Route-refresh and Soft-reconfiguration..............................................................................................................190
Aggregating Routes...................................................................................................................................................192
Filtering BGP...............................................................................................................................................................194
Configuring BGP Fast Fall-Over.............................................................................................................................199
Configuring Passive Peering................................................................................................................................... 201
Enabling Graceful Restart........................................................................................................................................201
Redistributing Routes...............................................................................................................................................202
Enabling Additional Paths........................................................................................................................................203
Configuring IP Community Lists............................................................................................................................204
Configuring an IP Extended Community List..................................................................................................... 205
Configure BGP attributes....................................................................................................................................... 206
Enabling Multipath.................................................................................................................................................... 209
Route Reflectors........................................................................................................................................................210
Enabling Route Flap Dampening..............................................................................................................................211
Changing BGP keepalive and hold timers............................................................................................................ 213
Setting the extended timer..................................................................................................................................... 214
Enabling or disabling BGP neighbors.....................................................................................................................214
Route Map Continue................................................................................................................................................. 215
Configuring BGP Confederations...........................................................................................................................216
Configuring a BGP VRF address family................................................................................................................ 216
Maintaining Existing AS Numbers During an AS Migration..............................................................................218
Allowing an AS Number to Appear in its Own AS Path.................................................................................... 218
Enabling MBGP Configurations.............................................................................................................................. 219
MBGP support for IPv6...........................................................................................................................................220
Configuring IPv6 MBGP between peers............................................................................................................. 220
Example-Configuring IPv4 and IPv6 neighbors................................................................................................. 220
Configure IPv6 NH Automatically for IPv6 Prefix Advertised over IPv4 Neighbor...................................223
BGP Regular Expression Optimization................................................................................................................. 224
Debugging BGP......................................................................................................................................................... 224
Chapter 10: Content Addressable Memory (CAM)......................................................................227
CAM Allocation................................................................................................................................................................ 227
Test CAM Usage............................................................................................................................................................. 229
View CAM Profiles..........................................................................................................................................................229
View CAM-ACL Settings...............................................................................................................................................230
View CAM Usage............................................................................................................................................................. 231
Configuring CAM Threshold and Silence Period..................................................................................................... 232
CAM Optimization...........................................................................................................................................................233
Troubleshoot CAM Profiling......................................................................................................................................... 233
QoS CAM Region Limitation...................................................................................................................................233
Syslog Error When the Table is Full......................................................................................................................234
Syslog Warning Upon 90 Percent Utilization of CAM......................................................................................234
Syslog Warning for Discrepancies Between Configured Extended Prefixes.............................................. 234
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