Service Manual

Four-Byte AS Numbers....................................................................................................219
AS4 Number Representation..........................................................................................219
AS Number Migration............................................................................................................ 221
BGP4 Management Information Base (MIB).....................................................................223
Important Points to Remember.................................................................................... 223
Configuration Information...................................................................................................224
BGP Configuration...........................................................................................................224
Enabling BGP...........................................................................................................................225
Configuring AS4 Number Representations...................................................................... 229
Configuring Peer Groups......................................................................................................231
Configuring BGP Fast Fall-Over..........................................................................................234
Configuring Passive Peering................................................................................................ 235
Maintaining Existing AS Numbers During an AS Migration........................................... 236
Allowing an AS Number to Appear in its Own AS Path.................................................. 237
Enabling Graceful Restart.....................................................................................................238
Enabling Neighbor Graceful Restart.................................................................................. 239
Filtering on an AS-Path Attribute........................................................................................240
Regular Expressions as Filters........................................................................................ 241
Filtering BGP Routes Using AS-PATH Information......................................................... 243
Redistributing Routes............................................................................................................244
Enabling Additional Paths.....................................................................................................245
Configuring IP Community Lists.........................................................................................245
Filtering Routes with Community Lists..............................................................................247
Manipulating the COMMUNITY Attribute..........................................................................247
Changing MED Attributes.....................................................................................................249
Changing the LOCAL_PREFERENCE Attribute................................................................ 249
Configuring the local System or a Different System to be the Next Hop for
BGP-Learned Routes.............................................................................................................250
Changing the WEIGHT Attribute......................................................................................... 251
Enabling Multipath..................................................................................................................251
Filtering BGP Routes Using Route Maps........................................................................... 252
Filtering BGP Routes Using AS-PATH Information......................................................... 253
Filtering BGP Routes..............................................................................................................253
Filtering BGP Routes Using Route Maps......................................................................255
Filtering BGP Routes Using AS-PATH Information................................................... 256
Configuring BGP Route Reflectors.....................................................................................257
Aggregating Routes............................................................................................................... 257
Configuring BGP Confederations.......................................................................................258
Enabling Route Flap Dampening........................................................................................ 259
Changing BGP Timers........................................................................................................... 261
Enabling BGP Neighbor Soft-Reconfiguration................................................................262
Route Map Continue............................................................................................................. 263
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