Concept Guide

Congure BFD for IS-IS...........................................................................................................................................166
Congure BFD for BGP...........................................................................................................................................168
Congure BFD for VRRP.........................................................................................................................................176
Conguring Protocol Liveness................................................................................................................................ 178
9 Border Gateway Protocol (BGP)................................................................................................................ 179
BGP IP version 4 (BGPv4) Overview.......................................................................................................................... 179
BGP Autonomous Systems..................................................................................................................................... 179
AS4 Number Representation................................................................................................................................... 181
Four-Byte AS Numbers............................................................................................................................................183
BGP router ID............................................................................................................................................................183
Sessions and Peers...................................................................................................................................................183
Establish a Session................................................................................................................................................... 184
BGP Attributes for selecting Best Path.................................................................................................................184
Multiprotocol BGP....................................................................................................................................................189
BGP global and address family conguration........................................................................................................190
Implement BGP with Dell EMC Networking OS...................................................................................................192
Conguration Information....................................................................................................................................... 195
Basic BGP conguration tasks..................................................................................................................................... 195
Prerequisite for conguring a BGP network......................................................................................................... 195
Restrictions............................................................................................................................................................... 196
Enabling BGP............................................................................................................................................................ 196
Enabling four-byte autonomous system numbers................................................................................................198
Changing a BGP router ID.......................................................................................................................................199
Conguring AS4 Number Representations...........................................................................................................199
Conguring a BGP peer...........................................................................................................................................201
Example-Conguring BGP routing between peers............................................................................................. 202
BGP peer group....................................................................................................................................................... 203
Advanced BGP conguration tasks.............................................................................................................................209
Route-refresh and Soft-reconguration................................................................................................................210
Aggregating Routes..................................................................................................................................................212
Filtering BGP.............................................................................................................................................................214
Conguring BGP Fast Fall-Over............................................................................................................................. 221
Conguring Passive Peering...................................................................................................................................222
Enabling Graceful Restart.......................................................................................................................................223
Redistributing Routes..............................................................................................................................................224
Enabling Additional Paths....................................................................................................................................... 225
Conguring IP Community Lists............................................................................................................................ 226
Conguring an IP Extended Community List........................................................................................................227
Congure BGP attributes....................................................................................................................................... 228
Enabling Multipath...................................................................................................................................................232
Route Reectors......................................................................................................................................................233
Enabling Route Flap Dampening............................................................................................................................ 234
Changing BGP keepalive and hold timers.............................................................................................................236
Setting the extended timer.....................................................................................................................................237
Enabling or disabling BGP neighbors.....................................................................................................................238
Contents
7