Reference Guide

Session State Changes......................................................................................................................158
Important Points to Remember..................................................................................................159
Configure BFD...................................................................................................................................159
Configure BFD for Physical Ports............................................................................................... 160
Configure BFD for Static Routes.................................................................................................163
Configure BFD for OSPF............................................................................................................. 165
Configure BFD for IS-IS...............................................................................................................168
Configure BFD for BGP................................................................................................................171
Configuring Protocol Liveness....................................................................................................178
Troubleshooting BFD........................................................................................................................ 178
10 Border Gateway Protocol IPv4 (BGPv4).................................................... 180
Autonomous Systems (AS)................................................................................................................180
Sessions and Peers............................................................................................................................182
Establish a Session.......................................................................................................................183
Route Reflectors................................................................................................................................184
Communities.....................................................................................................................................185
BGP Attributes................................................................................................................................... 185
Best Path Selection Criteria.........................................................................................................185
Weight................................................................................................................................................187
Local Preference............................................................................................................................... 187
Multi-Exit Discriminators (MEDs)................................................................................................188
Origin.................................................................................................................................................189
AS Path.............................................................................................................................................. 190
Next Hop........................................................................................................................................... 190
Multiprotocol BGP............................................................................................................................ 190
Implement BGP with Dell Networking OS....................................................................................... 191
Additional Path (Add-Path) Support............................................................................................191
Advertise IGP Cost as MED for Redistributed Routes.................................................................191
Ignore Router-ID for Some Best-Path Calculations..................................................................192
Four-Byte AS Numbers............................................................................................................... 192
AS4 Number Representation...................................................................................................... 193
AS Number Migration........................................................................................................................194
BGP4 Management Information Base (MIB).................................................................................... 196
Important Points to Remember..................................................................................................196
Configuration Information................................................................................................................197
BGP Configuration...................................................................................................................... 197
Enabling BGP.....................................................................................................................................198
Configuring AS4 Number Representations..................................................................................... 202
Configuring Peer Groups................................................................................................................. 203
Configuring BGP Fast Fall-Over.......................................................................................................206
Configuring Passive Peering............................................................................................................ 208