Reference Guide

Important Points to Remember..................................................................................................158
Configure BFD...................................................................................................................................158
Configure BFD for Physical Ports............................................................................................... 159
Configure BFD for Static Routes.................................................................................................162
Configure BFD for OSPF............................................................................................................. 164
Configure BFD for IS-IS...............................................................................................................167
Configure BFD for BGP............................................................................................................... 170
Configuring Protocol Liveness....................................................................................................177
Troubleshooting BFD........................................................................................................................ 177
10 Border Gateway Protocol IPv4 (BGPv4).....................................................179
Autonomous Systems (AS)................................................................................................................179
Sessions and Peers............................................................................................................................ 181
Establish a Session.......................................................................................................................182
Route Reflectors................................................................................................................................183
Communities.....................................................................................................................................184
BGP Attributes...................................................................................................................................184
Best Path Selection Criteria........................................................................................................ 184
Weight............................................................................................................................................... 186
Local Preference............................................................................................................................... 186
Multi-Exit Discriminators (MEDs)................................................................................................ 187
Origin.................................................................................................................................................188
AS Path...............................................................................................................................................189
Next Hop........................................................................................................................................... 189
Multiprotocol BGP............................................................................................................................ 189
Implement BGP with Dell Networking OS.......................................................................................190
Additional Path (Add-Path) Support........................................................................................... 190
Advertise IGP Cost as MED for Redistributed Routes................................................................190
Ignore Router-ID for Some Best-Path Calculations.................................................................. 191
Four-Byte AS Numbers................................................................................................................191
AS4 Number Representation...................................................................................................... 192
AS Number Migration........................................................................................................................193
BGP4 Management Information Base (MIB).................................................................................... 195
Important Points to Remember..................................................................................................195
Configuration Information................................................................................................................196
BGP Configuration...................................................................................................................... 196
Enabling BGP.....................................................................................................................................197
Configuring AS4 Number Representations......................................................................................201
Configuring Peer Groups................................................................................................................. 203
Configuring BGP Fast Fall-Over.......................................................................................................206
Configuring Passive Peering.............................................................................................................207
Maintaining Existing AS Numbers During an AS Migration............................................................. 208