Concept Guide

Conguring Peer Groups........................................................................................................................................ 206
Conguring BGP Fast Fall-Over............................................................................................................................. 214
Conguring Passive Peering................................................................................................................................... 215
Maintaining Existing AS Numbers During an AS Migration.................................................................................216
Allowing an AS Number to Appear in its Own AS Path....................................................................................... 217
Enabling Graceful Restart........................................................................................................................................218
Filtering on an AS-Path Attribute........................................................................................................................... 219
Regular Expressions as Filters................................................................................................................................220
Redistributing Routes...............................................................................................................................................221
Redistributing iBGP Routes into IGP.....................................................................................................................222
Enabling Additional Paths....................................................................................................................................... 225
Conguring IP Community Lists............................................................................................................................ 225
Conguring an IP Extended Community List........................................................................................................227
Filtering Routes with Community Lists..................................................................................................................227
Manipulating the COMMUNITY Attribute............................................................................................................ 228
Changing MED Attributes.......................................................................................................................................230
Changing the LOCAL_PREFERENCE Attribute..................................................................................................230
Conguring the local System or a Dierent System to be the Next Hop for BGP-Learned Routes............. 231
Changing the WEIGHT Attribute............................................................................................................................231
Enabling Multipath...................................................................................................................................................232
Route Reectors......................................................................................................................................................232
Conguring BGP Confederations.......................................................................................................................... 234
Enabling Route Flap Dampening............................................................................................................................ 234
Changing BGP keepalive and hold timers.............................................................................................................236
Setting the extended timer.....................................................................................................................................237
Enabling or disabling BGP neighbors.....................................................................................................................238
Route Map Continue............................................................................................................................................... 239
Enabling MBGP Congurations................................................................................................................................... 240
MBGP support for IPv6................................................................................................................................................240
Conguring IPv6 MBGP between peers.................................................................................................................... 240
Example-Conguring IPv4 and IPv6 neighbors.......................................................................................................... 241
Congure IPv6 NH Automatically for IPv6 Prex Advertised over IPv4 Neighbor............................................... 243
BGP Regular Expression Optimization........................................................................................................................245
Debugging BGP............................................................................................................................................................. 245
Storing Last and Bad PDUs....................................................................................................................................246
Capturing PDUs....................................................................................................................................................... 247
PDU Counters.......................................................................................................................................................... 248
10 Content Addressable Memory (CAM).......................................................................................................249
CAM Allocation...............................................................................................................................................................249
Test CAM Usage.............................................................................................................................................................251
View CAM-ACL Settings............................................................................................................................................... 251
View CAM Usage...........................................................................................................................................................253
Conguring CAM Threshold and Silence Period........................................................................................................253
Setting CAM Threshold and Silence Period......................................................................................................... 254
CAM Optimization......................................................................................................................................................... 255
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