Users Guide

Conguring a BGP VRF address family................................................................................................................ 203
Route-refresh and Soft-reconguration...............................................................................................................205
Aggregating Routes.................................................................................................................................................208
Filtering BGP Routes...............................................................................................................................................208
Filtering BGP Routes Using Route Maps...............................................................................................................210
Filtering BGP Routes Using AS-PATH Information.............................................................................................. 210
Conguring Peer Groups..........................................................................................................................................211
Conguring BGP Fast Fall-Over.............................................................................................................................219
Conguring Passive Peering...................................................................................................................................220
Maintaining Existing AS Numbers During an AS Migration................................................................................. 221
Allowing an AS Number to Appear in its Own AS Path...................................................................................... 222
Enabling Graceful Restart.......................................................................................................................................223
Filtering on an AS-Path Attribute...........................................................................................................................224
Regular Expressions as Filters................................................................................................................................225
Redistributing Routes..............................................................................................................................................226
Enabling Additional Paths........................................................................................................................................227
Conguring IP Community Lists.............................................................................................................................227
Conguring an IP Extended Community List....................................................................................................... 228
Filtering Routes with Community Lists................................................................................................................. 229
Manipulating the COMMUNITY Attribute............................................................................................................230
Changing MED Attributes........................................................................................................................................231
Changing the LOCAL_PREFERENCE Attribute..................................................................................................232
Conguring the local System or a Dierent System to be the Next Hop for BGP-Learned Routes.............232
Changing the WEIGHT Attribute........................................................................................................................... 233
Enabling Multipath...................................................................................................................................................233
Route Reectors......................................................................................................................................................234
Conguring BGP Confederations.......................................................................................................................... 235
Enabling Route Flap Dampening............................................................................................................................ 235
Changing BGP Timers.............................................................................................................................................238
Setting the extended timer.....................................................................................................................................238
Enabling or disabling BGP neighbors.....................................................................................................................239
Route Map Continue............................................................................................................................................... 240
Enabling MBGP Congurations.................................................................................................................................... 241
MBGP support for IPv6.................................................................................................................................................241
Conguring IPv6 MBGP between peers..................................................................................................................... 241
Example-Conguring IPv4 and IPv6 neighbors......................................................................................................... 242
Congure IPv6 NH Automatically for IPv6 Prex Advertised over IPv4 Neighbor............................................... 244
BGP Regular Expression Optimization........................................................................................................................246
Debugging BGP..............................................................................................................................................................246
Storing Last and Bad PDUs.................................................................................................................................... 247
Capturing PDUs....................................................................................................................................................... 248
PDU Counters.......................................................................................................................................................... 249
10 Content Addressable Memory (CAM)...................................................................................................... 250
CAM Allocation.............................................................................................................................................................. 250
Test CAM Usage............................................................................................................................................................252
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