Autonomous Systems (AS)................................................................................................... 207
Sessions and Peers.................................................................................................................210
Establish a Session............................................................................................................210
Route Reflectors......................................................................................................................211
BGP Attributes......................................................................................................................... 212
Best Path Selection Criteria............................................................................................ 212
Weight................................................................................................................................. 215
Local Preference...............................................................................................................215
Multi-Exit Discriminators (MEDs)...................................................................................216
Origin...................................................................................................................................217
AS Path................................................................................................................................ 217
Next Hop............................................................................................................................ 218
Multiprotocol BGP..................................................................................................................218
Implement BGP with Dell Networking OS........................................................................219
Additional Path (Add-Path) Support............................................................................. 219
Advertise IGP Cost as MED for Redistributed Routes............................................... 219
Ignore Router-ID in Best-Path Calculation................................................................220
Four-Byte AS Numbers................................................................................................... 220
AS4 Number Representation..........................................................................................221
AS Number Migration...................................................................................................... 222
BGP4 Management Information Base (MIB)...............................................................224
Important Points to Remember.................................................................................... 224
Configuration Information................................................................................................... 225
BGP Configuration.................................................................................................................226
Enabling BGP.....................................................................................................................227
Configuring AS4 Number Representations................................................................ 230
Configuring Peer Groups................................................................................................232
Configuring BGP Fast Fall-Over....................................................................................235
Configuring Passive Peering.......................................................................................... 236
Maintaining Existing AS Numbers During an AS Migration......................................237
Allowing an AS Number to Appear in its Own AS Path............................................ 238
Enabling Graceful Restart...............................................................................................239
Enabling Neighbor Graceful Restart............................................................................ 240
Filtering on an AS-Path Attribute...................................................................................241
Regular Expressions as Filters........................................................................................242
Redistributing Routes...................................................................................................... 244
Enabling Additional Paths...............................................................................................245
Configuring IP Community Lists...................................................................................245
Configuring an IP Extended Community List.............................................................246
Filtering Routes with Community Lists........................................................................247
Manipulating the COMMUNITY Attribute................................................................... 248
Changing MED Attributes...............................................................................................250
9.10(0.1)
8
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