Concept Guide

Congure BFD for Physical Ports.......................................................................................................................... 150
Congure BFD for Static Routes.............................................................................................................................151
Congure BFD for IPv6 Static Routes...................................................................................................................155
Congure BFD for OSPF.........................................................................................................................................157
Congure BFD for OSPFv3.....................................................................................................................................162
Congure BFD for IS-IS...........................................................................................................................................165
Congure BFD for BGP........................................................................................................................................... 167
Congure BFD for VRRP.........................................................................................................................................175
Conguring Protocol Liveness.................................................................................................................................177
9 Border Gateway Protocol (BGP).................................................................................................................178
BGP IP version 4 (BGPv4) Overview.......................................................................................................................... 178
BGP Autonomous Systems........................................................................................................................................... 179
AS4 Number Representation.................................................................................................................................. 180
Four-Byte AS Numbers............................................................................................................................................182
Multiprotocol BGP..........................................................................................................................................................182
Sessions and Peers.........................................................................................................................................................183
Establish a Session................................................................................................................................................... 183
BGP global and address family conguration..............................................................................................................184
BGP global conguration default values................................................................................................................184
BGP Attributes for selecting Best Path.......................................................................................................................185
Best Path Selection Criteria....................................................................................................................................185
Weight........................................................................................................................................................................ 187
Local Preference....................................................................................................................................................... 187
Multi-Exit Discriminators (MEDs)...........................................................................................................................188
Origin..........................................................................................................................................................................189
AS Path......................................................................................................................................................................190
Next Hop................................................................................................................................................................... 190
Implement BGP with Dell EMC Networking OS..........................................................................................................191
Additional Path (Add-Path) Support.......................................................................................................................191
Advertise IGP Cost as MED for Redistributed Routes......................................................................................... 191
Ignore Router-ID in Best-Path Calculation............................................................................................................ 192
AS Number Migration.............................................................................................................................................. 192
BGP4 Management Information Base (MIB)........................................................................................................193
Important Points to Remember.............................................................................................................................. 193
Conguration Information..............................................................................................................................................194
Basic BGP conguration tasks......................................................................................................................................194
Enabling BGP............................................................................................................................................................ 194
Conguring a BGP peer...........................................................................................................................................197
Conguring AS4 Number Representations........................................................................................................... 198
Conguring a BGP VRF address family.................................................................................................................199
Route-refresh and Soft-reconguration................................................................................................................201
Aggregating Routes.................................................................................................................................................204
Filtering BGP Routes...............................................................................................................................................204
Filtering BGP Routes Using Route Maps..............................................................................................................204
Filtering BGP Routes Using AS-PATH Information............................................................................................. 205
Contents
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