BGP Attributes....................................................................................................................................161
Best Path Selection Criteria.........................................................................................................162
Weight..........................................................................................................................................164
Local Preference......................................................................................................................... 164
Multi-Exit Discriminators (MEDs)................................................................................................ 165
Origin........................................................................................................................................... 166
AS Path......................................................................................................................................... 167
Next Hop......................................................................................................................................167
Multiprotocol BGP............................................................................................................................ 168
Implement BGP with Dell Networking OS.......................................................................................168
Additional Path (Add-Path) Support........................................................................................... 168
Advertise IGP Cost as MED for Redistributed Routes................................................................ 168
Ignore Router-ID in Best-Path Calculation................................................................................169
Four-Byte AS Numbers............................................................................................................... 169
AS4 Number Representation...................................................................................................... 170
AS Number Migration...................................................................................................................171
BGP4 Management Information Base (MIB)...............................................................................173
Important Points to Remember.................................................................................................. 173
Configuration Information................................................................................................................174
BGP Configuration............................................................................................................................ 174
Enabling BGP............................................................................................................................... 175
Configuring AS4 Number Representations................................................................................ 179
Configuring Peer Groups............................................................................................................ 181
Configuring BGP Fast Fall-Over..................................................................................................183
Configuring Passive Peering....................................................................................................... 185
Maintaining Existing AS Numbers During an AS Migration........................................................186
Allowing an AS Number to Appear in its Own AS Path..............................................................187
Enabling Graceful Restart........................................................................................................... 188
Enabling Neighbor Graceful Restart...........................................................................................189
Filtering on an AS-Path Attribute................................................................................................189
Regular Expressions as Filters......................................................................................................191
Redistributing Routes.................................................................................................................. 192
Enabling Additional Paths............................................................................................................193
Configuring IP Community Lists.................................................................................................193
Configuring an IP Extended Community List.............................................................................195
Filtering Routes with Community Lists.......................................................................................196
Manipulating the COMMUNITY Attribute...................................................................................196
Changing MED Attributes........................................................................................................... 198
Changing the LOCAL_PREFERENCE Attribute.......................................................................... 198
Changing the NEXT_HOP Attribute........................................................................................... 199
Changing the WEIGHT Attribute................................................................................................200
Enabling Multipath......................................................................................................................200
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