Concept Guide

BFD Sessions............................................................................................................................................................ 149
BFD Three-Way Handshake....................................................................................................................................150
Session State Changes............................................................................................................................................152
Important Points to Remember.................................................................................................................................... 152
Congure BFD................................................................................................................................................................ 152
Congure BFD for Physical Ports...........................................................................................................................153
Congure BFD for Static Routes............................................................................................................................154
Congure BFD for IPv6 Static Routes...................................................................................................................158
Congure BFD for OSPF.........................................................................................................................................160
Congure BFD for OSPFv3.....................................................................................................................................165
Congure BFD for IS-IS...........................................................................................................................................168
Congure BFD for BGP........................................................................................................................................... 170
Congure BFD for VRRP.........................................................................................................................................178
Conguring Protocol Liveness................................................................................................................................180
9 Border Gateway Protocol (BGP)................................................................................................................. 181
BGP IP version 4 (BGPv4) Overview...........................................................................................................................181
BGP Autonomous Systems...........................................................................................................................................182
AS4 Number Representation.................................................................................................................................. 183
Four-Byte AS Numbers........................................................................................................................................... 185
Multiprotocol BGP..........................................................................................................................................................185
Sessions and Peers........................................................................................................................................................ 186
Establish a Session...................................................................................................................................................186
BGP global and address family conguration..............................................................................................................187
BGP global conguration default values................................................................................................................ 187
BGP Attributes for selecting Best Path.......................................................................................................................188
Best Path Selection Criteria....................................................................................................................................188
Weight........................................................................................................................................................................190
Local Preference.......................................................................................................................................................190
Multi-Exit Discriminators (MEDs)........................................................................................................................... 191
Origin..........................................................................................................................................................................192
AS Path......................................................................................................................................................................193
Next Hop................................................................................................................................................................... 193
Implement BGP with Dell EMC Networking OS.........................................................................................................194
Additional Path (Add-Path) Support......................................................................................................................194
Advertise IGP Cost as MED for Redistributed Routes........................................................................................ 194
Ignore Router-ID in Best-Path Calculation............................................................................................................ 195
AS Number Migration.............................................................................................................................................. 195
BGP4 Management Information Base (MIB)........................................................................................................196
Important Points to Remember..............................................................................................................................196
Conguration Information..............................................................................................................................................197
Basic BGP conguration tasks......................................................................................................................................197
Enabling BGP............................................................................................................................................................ 197
Conguring a BGP peer..........................................................................................................................................200
Conguring AS4 Number Representations........................................................................................................... 201
Conguring a BGP VRF address family................................................................................................................ 202
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