Concept Guide

BFD Sessions............................................................................................................................................................ 149
BFD Three-Way Handshake....................................................................................................................................150
Session State Changes............................................................................................................................................152
Important Points to Remember.................................................................................................................................... 152
Congure BFD................................................................................................................................................................ 153
Congure BFD for Physical Ports...........................................................................................................................153
Congure BFD for Static Routes............................................................................................................................155
Congure BFD for IPv6 Static Routes...................................................................................................................158
Congure BFD for OSPF..........................................................................................................................................161
Congure BFD for OSPFv3.....................................................................................................................................166
Congure BFD for IS-IS...........................................................................................................................................169
Congure BFD for BGP............................................................................................................................................171
Congure BFD for VRRP.........................................................................................................................................179
Conguring Protocol Liveness.................................................................................................................................181
9 Border Gateway Protocol (BGP)................................................................................................................ 182
BGP IP version 4 (BGPv4) Overview.......................................................................................................................... 182
BGP Autonomous Systems.....................................................................................................................................182
AS4 Number Representation.................................................................................................................................. 184
Four-Byte AS Numbers............................................................................................................................................186
BGP router ID............................................................................................................................................................186
Sessions and Peers.................................................................................................................................................. 186
Establish a Session................................................................................................................................................... 187
BGP Attributes for selecting Best Path................................................................................................................. 187
Multiprotocol BGP....................................................................................................................................................192
BGP global and address family conguration........................................................................................................193
Implement BGP with Dell EMC Networking OS...................................................................................................195
Conguration Information........................................................................................................................................198
Basic BGP conguration tasks......................................................................................................................................198
Prerequisite for conguring a BGP network......................................................................................................... 198
Restrictions............................................................................................................................................................... 199
Enabling BGP............................................................................................................................................................ 199
Enabling four-byte autonomous system numbers................................................................................................201
Changing a BGP router ID...................................................................................................................................... 202
Conguring AS4 Number Representations.......................................................................................................... 202
Conguring a BGP peer..........................................................................................................................................204
Example-Conguring BGP routing between peers............................................................................................. 205
BGP peer group....................................................................................................................................................... 206
Advanced BGP conguration tasks..............................................................................................................................212
Route-refresh and Soft-reconguration................................................................................................................213
Aggregating Routes..................................................................................................................................................215
Filtering BGP............................................................................................................................................................. 217
Conguring BGP Fast Fall-Over............................................................................................................................ 224
Conguring Passive Peering...................................................................................................................................225
Enabling Graceful Restart.......................................................................................................................................226
Redistributing Routes.............................................................................................................................................. 227
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