Administrator Guide

Configure BFD................................................................................................................................................................ 149
Configure BFD for Physical Ports..........................................................................................................................150
Configure BFD for Static Routes............................................................................................................................151
Configure BFD for OSPF.........................................................................................................................................154
Configure BFD for OSPFv3.................................................................................................................................... 157
Configure BFD for IS-IS...........................................................................................................................................158
Configure BFD for BGP...........................................................................................................................................160
Configure BFD for VRRP.........................................................................................................................................167
Configuring Protocol Liveness................................................................................................................................170
Troubleshooting BFD............................................................................................................................................... 170
9 Border Gateway Protocol IPv4 (BGPv4).................................................................................................... 172
Autonomous Systems (AS)...........................................................................................................................................172
Sessions and Peers.........................................................................................................................................................174
Establish a Session................................................................................................................................................... 174
Route Reflectors............................................................................................................................................................ 175
BGP Attributes................................................................................................................................................................176
Best Path Selection Criteria.................................................................................................................................... 177
Weight........................................................................................................................................................................178
Local Preference.......................................................................................................................................................178
Multi-Exit Discriminators (MEDs)...........................................................................................................................179
Origin..........................................................................................................................................................................180
AS Path...................................................................................................................................................................... 181
Next Hop....................................................................................................................................................................181
Multiprotocol BGP.......................................................................................................................................................... 181
Implement BGP with Dell Networking OS...................................................................................................................182
Additional Path (Add-Path) Support..................................................................................................................... 182
Advertise IGP Cost as MED for Redistributed Routes........................................................................................182
Ignore Router-ID in Best-Path Calculation............................................................................................................183
Four-Byte AS Numbers........................................................................................................................................... 183
AS4 Number Representation..................................................................................................................................183
AS Number Migration.............................................................................................................................................. 185
BGP4 Management Information Base (MIB)....................................................................................................... 186
Important Points to Remember..............................................................................................................................186
Configuration Information............................................................................................................................................. 187
BGP Configuration......................................................................................................................................................... 187
Enabling BGP............................................................................................................................................................ 188
Configuring AS4 Number Representations............................................................................................................191
Configuring Peer Groups.........................................................................................................................................193
Configuring BGP Fast Fall-Over.............................................................................................................................195
Configuring Passive Peering................................................................................................................................... 197
Maintaining Existing AS Numbers During an AS Migration.................................................................................197
Allowing an AS Number to Appear in its Own AS Path.......................................................................................198
Enabling Graceful Restart....................................................................................................................................... 199
Enabling Neighbor Graceful Restart..................................................................................................................... 200
Filtering on an AS-Path Attribute..........................................................................................................................200
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