Setup Guide

9 Border Gateway Protocol (BGP)................................................................................................................ 176
BGP IP version 4 (BGPv4) Overview.......................................................................................................................... 176
BGP Autonomous Systems..................................................................................................................................... 176
AS4 Number Representation.................................................................................................................................. 178
Four-Byte AS Numbers........................................................................................................................................... 180
BGP router ID............................................................................................................................................................180
Sessions and Peers.................................................................................................................................................. 180
Establish a Session....................................................................................................................................................181
BGP Attributes for selecting Best Path..................................................................................................................181
Multiprotocol BGP....................................................................................................................................................186
BGP global and address family conguration........................................................................................................ 187
Implement BGP with Dell EMC Networking OS...................................................................................................189
Conguration Information........................................................................................................................................192
Basic BGP conguration tasks......................................................................................................................................192
Prerequisite for conguring a BGP network......................................................................................................... 192
Restrictions............................................................................................................................................................... 193
Enabling BGP............................................................................................................................................................ 193
Enabling four-byte autonomous system numbers................................................................................................195
Changing a BGP router ID.......................................................................................................................................196
Conguring AS4 Number Representations........................................................................................................... 196
Conguring a BGP peer...........................................................................................................................................198
Example-Conguring BGP routing between peers..............................................................................................199
BGP peer group....................................................................................................................................................... 200
Advanced BGP conguration tasks.............................................................................................................................206
Route-refresh and Soft-reconguration............................................................................................................... 207
Aggregating Routes.................................................................................................................................................209
Filtering BGP..............................................................................................................................................................211
Conguring BGP Fast Fall-Over............................................................................................................................. 218
Conguring Passive Peering................................................................................................................................... 219
Enabling Graceful Restart.......................................................................................................................................220
Redistributing Routes...............................................................................................................................................221
Enabling Additional Paths........................................................................................................................................222
Conguring IP Community Lists............................................................................................................................ 223
Conguring an IP Extended Community List....................................................................................................... 224
Congure BGP attributes....................................................................................................................................... 225
Enabling Multipath...................................................................................................................................................229
Route Reectors......................................................................................................................................................230
Enabling Route Flap Dampening............................................................................................................................. 231
Changing BGP keepalive and hold timers.............................................................................................................233
Setting the extended timer.....................................................................................................................................234
Enabling or disabling BGP neighbors.....................................................................................................................235
Route Map Continue............................................................................................................................................... 236
Conguring BGP Confederations.......................................................................................................................... 236
Conguring a BGP VRF address family.................................................................................................................237
Maintaining Existing AS Numbers During an AS Migration................................................................................ 238
Contents
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