Setup Guide

Congure BFD for IS-IS...........................................................................................................................................167
Congure BFD for BGP...........................................................................................................................................169
Congure BFD for VRRP.........................................................................................................................................177
Conguring Protocol Liveness................................................................................................................................ 179
9 Border Gateway Protocol (BGP)................................................................................................................ 180
BGP IP version 4 (BGPv4) Overview..........................................................................................................................180
BGP Autonomous Systems.....................................................................................................................................180
AS4 Number Representation.................................................................................................................................. 182
Four-Byte AS Numbers............................................................................................................................................184
BGP router ID............................................................................................................................................................184
Sessions and Peers...................................................................................................................................................184
Establish a Session...................................................................................................................................................185
BGP Attributes for selecting Best Path.................................................................................................................185
Multiprotocol BGP....................................................................................................................................................190
BGP global and address family conguration........................................................................................................ 191
Implement BGP with Dell EMC Networking OS...................................................................................................193
Conguration Information........................................................................................................................................196
Basic BGP conguration tasks..................................................................................................................................... 196
Prerequisite for conguring a BGP network......................................................................................................... 196
Restrictions................................................................................................................................................................197
Enabling BGP............................................................................................................................................................ 197
Enabling four-byte autonomous system numbers................................................................................................199
Changing a BGP router ID...................................................................................................................................... 200
Conguring AS4 Number Representations.......................................................................................................... 200
Conguring a BGP peer..........................................................................................................................................202
Example-Conguring BGP routing between peers............................................................................................. 203
BGP peer group....................................................................................................................................................... 204
Advanced BGP conguration tasks............................................................................................................................. 210
Route-refresh and Soft-reconguration.................................................................................................................211
Aggregating Routes..................................................................................................................................................213
Filtering BGP.............................................................................................................................................................215
Conguring BGP Fast Fall-Over............................................................................................................................ 222
Conguring Passive Peering...................................................................................................................................223
Enabling Graceful Restart.......................................................................................................................................224
Redistributing Routes..............................................................................................................................................225
Enabling Additional Paths....................................................................................................................................... 226
Conguring IP Community Lists.............................................................................................................................227
Conguring an IP Extended Community List....................................................................................................... 228
Congure BGP attributes....................................................................................................................................... 229
Enabling Multipath...................................................................................................................................................233
Route Reectors......................................................................................................................................................234
Enabling Route Flap Dampening............................................................................................................................ 235
Changing BGP keepalive and hold timers............................................................................................................. 237
Setting the extended timer.....................................................................................................................................238
Enabling or disabling BGP neighbors.....................................................................................................................239
Contents
7