Concept Guide

Route-refresh and Soft-reconguration............................................................................................................... 206
Aggregating Routes.................................................................................................................................................209
Filtering BGP Routes................................................................................................................................................210
Filtering BGP Routes Using Route Maps...............................................................................................................210
Filtering BGP Routes Using AS-PATH Information............................................................................................... 211
Conguring Peer Groups......................................................................................................................................... 212
Conguring BGP Fast Fall-Over............................................................................................................................ 220
Conguring Passive Peering................................................................................................................................... 221
Maintaining Existing AS Numbers During an AS Migration................................................................................ 222
Allowing an AS Number to Appear in its Own AS Path.......................................................................................223
Enabling Graceful Restart.......................................................................................................................................224
Filtering on an AS-Path Attribute.......................................................................................................................... 225
Regular Expressions as Filters................................................................................................................................226
Redistributing Routes.............................................................................................................................................. 227
Enabling Additional Paths........................................................................................................................................228
Conguring IP Community Lists............................................................................................................................ 229
Conguring an IP Extended Community List....................................................................................................... 230
Filtering Routes with Community Lists.................................................................................................................. 231
Manipulating the COMMUNITY Attribute............................................................................................................ 232
Changing MED Attributes.......................................................................................................................................234
Changing the LOCAL_PREFERENCE Attribute..................................................................................................234
Conguring the local System or a Dierent System to be the Next Hop for BGP-Learned Routes............ 235
Changing the WEIGHT Attribute...........................................................................................................................235
Enabling Multipath...................................................................................................................................................236
Route Reectors......................................................................................................................................................236
Conguring BGP Confederations.......................................................................................................................... 238
Enabling Route Flap Dampening............................................................................................................................ 238
Changing BGP keepalive and hold timers.............................................................................................................240
Setting the extended timer..................................................................................................................................... 241
Enabling or disabling BGP neighbors.....................................................................................................................242
Route Map Continue............................................................................................................................................... 243
Enabling MBGP Congurations....................................................................................................................................244
MBGP support for IPv6................................................................................................................................................ 244
Conguring IPv6 MBGP between peers.....................................................................................................................244
Example-Conguring IPv4 and IPv6 neighbors......................................................................................................... 245
Congure IPv6 NH Automatically for IPv6 Prex Advertised over IPv4 Neighbor................................................247
BGP Regular Expression Optimization........................................................................................................................249
Debugging BGP..............................................................................................................................................................249
Storing Last and Bad PDUs....................................................................................................................................250
Capturing PDUs........................................................................................................................................................251
PDU Counters.......................................................................................................................................................... 252
10 Content Addressable Memory (CAM).......................................................................................................253
CAM Allocation.............................................................................................................................................................. 253
Test CAM Usage............................................................................................................................................................255
View CAM-ACL Settings.............................................................................................................................................. 255
8
Contents