Reference Guide

Origin............................................................................................................................................191
AS Path.........................................................................................................................................192
Next Hop......................................................................................................................................192
Multiprotocol BGP.............................................................................................................................193
Implement BGP with Dell Networking OS....................................................................................... 193
Additional Path (Add-Path) Support........................................................................................... 193
Advertise IGP Cost as MED for Redistributed Routes................................................................ 193
Ignore Router-ID for Some Best-Path Calculations..................................................................194
Four-Byte AS Numbers............................................................................................................... 194
AS4 Number Representation...................................................................................................... 195
AS Number Migration..................................................................................................................196
BGP4 Management Information Base (MIB).............................................................................. 198
Important Points to Remember..................................................................................................198
Configuration Information................................................................................................................199
BGP Configuration............................................................................................................................199
Enabling BGP.............................................................................................................................. 200
Configuring AS4 Number Representations............................................................................... 204
Configuring Peer Groups........................................................................................................... 206
Configuring BGP Fast Fall-Over.................................................................................................209
Configuring Passive Peering....................................................................................................... 210
Maintaining Existing AS Numbers During an AS Migration........................................................ 211
Allowing an AS Number to Appear in its Own AS Path..............................................................212
Enabling Graceful Restart............................................................................................................213
Enabling Neighbor Graceful Restart...........................................................................................214
Filtering on an AS-Path Attribute................................................................................................ 215
Regular Expressions as Filters..................................................................................................... 216
Redistributing Routes.................................................................................................................. 218
Enabling Additional Paths............................................................................................................218
Configuring IP Community Lists.................................................................................................219
Configuring an IP Extended Community List.............................................................................221
Filtering Routes with Community Lists...................................................................................... 222
Manipulating the COMMUNITY Attribute...................................................................................222
Changing MED Attributes........................................................................................................... 224
Changing the LOCAL_PREFERENCE Attribute.......................................................................... 224
Changing the NEXT_HOP Attribute........................................................................................... 225
Changing the WEIGHT Attribute................................................................................................ 226
Enabling Multipath...................................................................................................................... 226
Filtering BGP Routes................................................................................................................... 226
Filtering BGP Routes Using Route Maps.................................................................................... 228
Filtering BGP Routes Using AS-PATH Information....................................................................229
Configuring BGP Route Reflectors............................................................................................ 229
Aggregating Routes.................................................................................................................... 230