Reference Guide

Configure BFD for OSPF............................................................................................................. 145
Configure BFD for OSPFv3......................................................................................................... 148
Configure BFD for IS-IS...............................................................................................................149
Configure BFD for BGP............................................................................................................... 152
Configure BFD for VRRP............................................................................................................. 158
Configuring Protocol Liveness....................................................................................................161
Troubleshooting BFD.................................................................................................................. 162
9 Border Gateway Protocol IPv4 (BGPv4).......................................................164
Autonomous Systems (AS)................................................................................................................164
Sessions and Peers............................................................................................................................166
Establish a Session.......................................................................................................................167
Route Reflectors................................................................................................................................167
BGP Attributes................................................................................................................................... 168
Best Path Selection Criteria........................................................................................................ 169
Weight...........................................................................................................................................171
Local Preference.......................................................................................................................... 171
Multi-Exit Discriminators (MEDs)................................................................................................ 172
Origin............................................................................................................................................173
AS Path......................................................................................................................................... 174
Next Hop......................................................................................................................................174
Multiprotocol BGP.............................................................................................................................175
Implement BGP with Dell Networking OS....................................................................................... 175
Additional Path (Add-Path) Support............................................................................................175
Advertise IGP Cost as MED for Redistributed Routes.................................................................175
Ignore Router-ID in Best-Path Calculation................................................................................176
Four-Byte AS Numbers................................................................................................................176
AS4 Number Representation.......................................................................................................177
AS Number Migration.................................................................................................................. 178
BGP4 Management Information Base (MIB).............................................................................. 180
Important Points to Remember..................................................................................................180
Configuration Information................................................................................................................ 181
BGP Configuration.............................................................................................................................181
Enabling BGP...............................................................................................................................182
Configuring AS4 Number Representations................................................................................186
Configuring Peer Groups............................................................................................................188
Configuring BGP Fast Fall-Over................................................................................................. 190
Configuring Passive Peering....................................................................................................... 192
Maintaining Existing AS Numbers During an AS Migration........................................................193
Allowing an AS Number to Appear in its Own AS Path..............................................................194
Enabling Graceful Restart............................................................................................................195
Enabling Neighbor Graceful Restart...........................................................................................196
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