Setup Guide

Table Of Contents
Enabling four-byte autonomous system numbers.................................................................................................... 171
Changing a BGP router ID...........................................................................................................................................172
Configuring AS4 Number Representations...............................................................................................................172
Configuring a BGP peer...............................................................................................................................................173
Example-Configuring BGP routing between peers..................................................................................................174
BGP peer group............................................................................................................................................................175
Advanced BGP configuration tasks.................................................................................................................................182
Route-refresh and Soft-reconfiguration...................................................................................................................182
Aggregating Routes..................................................................................................................................................... 184
Filtering BGP.................................................................................................................................................................186
Configuring BGP Fast Fall-Over................................................................................................................................. 191
Configuring Passive Peering.......................................................................................................................................192
Enabling Graceful Restart........................................................................................................................................... 193
Redistributing Routes.................................................................................................................................................. 194
Enabling Additional Paths............................................................................................................................................194
Configuring IP Community Lists.................................................................................................................................195
Configuring an IP Extended Community List............................................................................................................196
Configure BGP attributes............................................................................................................................................197
Enabling Multipath.......................................................................................................................................................200
Route Reflectors.......................................................................................................................................................... 201
Enabling Route Flap Dampening................................................................................................................................202
Changing BGP keepalive and hold timers................................................................................................................ 204
Setting the extended timer........................................................................................................................................204
Enabling or disabling BGP neighbors........................................................................................................................ 205
Route Map Continue...................................................................................................................................................206
Configuring BGP Confederations..............................................................................................................................206
Configuring a BGP VRF address family.................................................................................................................... 207
Maintaining Existing AS Numbers During an AS Migration....................................................................................208
Allowing an AS Number to Appear in its Own AS Path..........................................................................................209
Enabling MBGP Configurations..................................................................................................................................210
MBGP support for IPv6.............................................................................................................................................. 210
Configuring IPv6 MBGP between peers...................................................................................................................210
Example-Configuring IPv4 and IPv6 neighbors.........................................................................................................211
Configure IPv6 NH Automatically for IPv6 Prefix Advertised over IPv4 Neighbor............................................. 213
BGP Regular Expression Optimization...................................................................................................................... 214
Debugging BGP............................................................................................................................................................215
10 Content Addressable Memory (CAM)........................................................................................ 217
CAM Allocation...................................................................................................................................................................217
Test CAM Usage................................................................................................................................................................218
View CAM-ACL Settings.................................................................................................................................................. 219
View CAM Usage.............................................................................................................................................................. 220
Configuring CAM Threshold and Silence Period............................................................................................................221
CAM Optimization.............................................................................................................................................................222
Troubleshoot CAM Profiling.............................................................................................................................................222
QoS CAM Region Limitation...................................................................................................................................... 222
Syslog Error When the Table is Full.......................................................................................................................... 222
Syslog Warning Upon 90 Percent Utilization of CAM............................................................................................223
Syslog Warning for Discrepancies Between Configured Extended Prefixes.......................................................223
Unified Forwarding Table (UFT) Modes.........................................................................................................................223
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