Concept Guide

BFD Three-Way Handshake.................................................................................................................................... 149
Session State Changes.............................................................................................................................................151
Important Points to Remember.....................................................................................................................................151
Congure BFD................................................................................................................................................................ 152
Congure BFD for Physical Ports...........................................................................................................................152
Congure BFD for Static Routes............................................................................................................................154
Congure BFD for OSPF.........................................................................................................................................156
Congure BFD for OSPFv3.....................................................................................................................................160
Congure BFD for IS-IS...........................................................................................................................................163
Congure BFD for BGP...........................................................................................................................................165
Congure BFD for VRRP.........................................................................................................................................173
Conguring Protocol Liveness................................................................................................................................ 176
Troubleshooting BFD................................................................................................................................................176
9 Border Gateway Protocol (BGP).................................................................................................................178
BGP IP version 4 (BGPv4) Overview.......................................................................................................................... 178
BGP Autonomous Systems..................................................................................................................................... 178
AS4 Number Representation.................................................................................................................................. 180
Four-Byte AS Numbers............................................................................................................................................182
BGP router ID............................................................................................................................................................182
Sessions and Peers...................................................................................................................................................182
Establish a Session................................................................................................................................................... 183
BGP Attributes for selecting Best Path.................................................................................................................183
Multiprotocol BGP....................................................................................................................................................188
BGP global and address family conguration........................................................................................................189
Implement BGP with Dell EMC Networking OS....................................................................................................191
Conguration Information........................................................................................................................................194
Basic BGP conguration tasks......................................................................................................................................194
Prerequisite for conguring a BGP network......................................................................................................... 194
Restrictions............................................................................................................................................................... 195
Enabling BGP............................................................................................................................................................ 195
Enabling four-byte autonomous system numbers................................................................................................ 197
Changing a BGP router ID.......................................................................................................................................198
Conguring AS4 Number Representations........................................................................................................... 198
Conguring a BGP peer..........................................................................................................................................200
Example-Conguring BGP routing between peers.............................................................................................. 201
BGP peer group....................................................................................................................................................... 202
Advanced BGP conguration tasks.............................................................................................................................208
Route-refresh and Soft-reconguration............................................................................................................... 209
Aggregating Routes.................................................................................................................................................. 211
Filtering BGP.............................................................................................................................................................213
Conguring BGP Fast Fall-Over............................................................................................................................ 220
Conguring Passive Peering................................................................................................................................... 221
Enabling Graceful Restart.......................................................................................................................................222
Redistributing Routes..............................................................................................................................................223
Enabling Additional Paths........................................................................................................................................224
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