Administrator Guide

Configure BFD for OSPF............................................................................................................. 146
Configure BFD for OSPFv3......................................................................................................... 149
Configure BFD for IS-IS...............................................................................................................150
Configure BFD for BGP............................................................................................................... 153
Configure BFD for VRRP............................................................................................................. 160
Configuring Protocol Liveness....................................................................................................163
Troubleshooting BFD.................................................................................................................. 163
9 Border Gateway Protocol IPv4 (BGPv4).......................................................165
Autonomous Systems (AS)................................................................................................................165
Sessions and Peers............................................................................................................................ 167
Establish a Session.......................................................................................................................168
Route Reflectors................................................................................................................................168
BGP Attributes................................................................................................................................... 169
Best Path Selection Criteria.........................................................................................................170
Weight.......................................................................................................................................... 172
Local Preference..........................................................................................................................172
Multi-Exit Discriminators (MEDs)................................................................................................ 173
Origin........................................................................................................................................... 174
AS Path......................................................................................................................................... 175
Next Hop......................................................................................................................................175
Multiprotocol BGP.............................................................................................................................176
Implement BGP with Dell Networking OS....................................................................................... 176
Additional Path (Add-Path) Support............................................................................................176
Advertise IGP Cost as MED for Redistributed Routes................................................................ 176
Ignore Router-ID for Some Best-Path Calculations.................................................................. 177
Four-Byte AS Numbers................................................................................................................177
AS4 Number Representation.......................................................................................................178
AS Number Migration.................................................................................................................. 179
BGP4 Management Information Base (MIB)...............................................................................181
Important Points to Remember.................................................................................................. 181
Configuration Information................................................................................................................182
BGP Configuration............................................................................................................................ 182
Enabling BGP...............................................................................................................................183
Configuring AS4 Number Representations................................................................................ 187
Configuring Peer Groups............................................................................................................189
Configuring BGP Fast Fall-Over..................................................................................................191
Configuring Passive Peering....................................................................................................... 193
Maintaining Existing AS Numbers During an AS Migration........................................................194
Allowing an AS Number to Appear in its Own AS Path..............................................................195
Enabling Graceful Restart........................................................................................................... 196
Enabling Neighbor Graceful Restart........................................................................................... 197