Users Guide
Congure BFD for BGP................................................................................................................................................. 157
Prerequisites..............................................................................................................................................................157
Establishing Sessions with BGP Neighbors...........................................................................................................157
Disabling BFD for BGP.............................................................................................................................................162
Use BFD in a BGP Peer Group............................................................................................................................... 162
Displaying BFD for BGP Information...................................................................................................................... 162
Congure BFD for VRRP...............................................................................................................................................166
Related Conguration Tasks....................................................................................................................................166
Establishing Sessions with All VRRP Neighbors................................................................................................... 167
Establishing VRRP Sessions on VRRP Neighbors................................................................................................167
Changing VRRP Session Parameters.....................................................................................................................168
Disabling BFD for VRRP.......................................................................................................................................... 168
Congure BFD for VLANs.............................................................................................................................................169
Related Conguration Task..................................................................................................................................... 169
Establish Sessions with VLAN Neighbors..............................................................................................................170
Changing VLAN Session Parameters.....................................................................................................................170
Disabling BFD for VLANs..........................................................................................................................................171
Congure BFD for Port-Channels.................................................................................................................................171
Related Conguration Tasks.....................................................................................................................................171
Establish Sessions on Port-Channels.....................................................................................................................172
Changing Physical Port Session Parameters.........................................................................................................172
Disabling BFD for Port-Channels............................................................................................................................173
Conguring Protocol Liveness...................................................................................................................................... 173
10 Border Gateway Protocol IPv4 (BGPv4)................................................................................................... 174
Autonomous Systems (AS)............................................................................................................................................174
Sessions and Peers.........................................................................................................................................................176
Establish a Session................................................................................................................................................... 176
Route Reectors............................................................................................................................................................. 177
Communities..............................................................................................................................................................178
BGP Attributes................................................................................................................................................................178
Best Path Selection Criteria.................................................................................................................................... 178
Weight........................................................................................................................................................................180
Local Preference.......................................................................................................................................................180
Multi-Exit Discriminators (MEDs)........................................................................................................................... 181
Origin..........................................................................................................................................................................182
AS Path......................................................................................................................................................................183
Next Hop................................................................................................................................................................... 183
Multiprotocol BGP..........................................................................................................................................................183
Implement BGP with the Dell Networking OS............................................................................................................184
Additional Path (Add-Path) Support......................................................................................................................184
Advertise IGP Cost as MED for Redistributed Routes........................................................................................ 184
Ignore Router-ID for Some Best-Path Calculations............................................................................................. 185
Four-Byte AS Numbers........................................................................................................................................... 185
AS4 Number Representation.................................................................................................................................. 185
AS Number Migration...............................................................................................................................................187
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