Concept Guide
Congure BFD for BGP.................................................................................................................................................156
Prerequisites..............................................................................................................................................................156
Establishing Sessions with BGP Neighbors.......................................................................................................... 156
Disabling BFD for BGP..............................................................................................................................................161
Use BFD in a BGP Peer Group................................................................................................................................ 161
Displaying BFD for BGP Information.......................................................................................................................161
Congure BFD for VRRP...............................................................................................................................................165
Related Conguration Tasks....................................................................................................................................165
Establishing Sessions with All VRRP Neighbors...................................................................................................166
Establishing VRRP Sessions on VRRP Neighbors................................................................................................166
Changing VRRP Session Parameters.....................................................................................................................167
Disabling BFD for VRRP...........................................................................................................................................167
Congure BFD for VLANs.............................................................................................................................................168
Related Conguration Task..................................................................................................................................... 168
Establish Sessions with VLAN Neighbors............................................................................................................. 169
Changing VLAN Session Parameters.....................................................................................................................169
Disabling BFD for VLANs.........................................................................................................................................170
Congure BFD for Port-Channels................................................................................................................................ 170
Related Conguration Tasks....................................................................................................................................170
Establish Sessions on Port-Channels......................................................................................................................171
Changing Physical Port Session Parameters......................................................................................................... 171
Disabling BFD for Port-Channels............................................................................................................................172
Conguring Protocol Liveness...................................................................................................................................... 172
10 Border Gateway Protocol IPv4 (BGPv4)................................................................................................... 173
Autonomous Systems (AS)........................................................................................................................................... 173
Sessions and Peers.........................................................................................................................................................175
Establish a Session................................................................................................................................................... 175
Route Reectors.............................................................................................................................................................176
Communities..............................................................................................................................................................177
BGP Attributes................................................................................................................................................................177
Best Path Selection Criteria.................................................................................................................................... 177
Weight........................................................................................................................................................................179
Local Preference.......................................................................................................................................................179
Multi-Exit Discriminators (MEDs)...........................................................................................................................180
Origin...........................................................................................................................................................................181
AS Path......................................................................................................................................................................182
Next Hop................................................................................................................................................................... 182
Multiprotocol BGP..........................................................................................................................................................182
Implement BGP with the Dell Networking OS............................................................................................................183
Additional Path (Add-Path) Support......................................................................................................................183
Advertise IGP Cost as MED for Redistributed Routes........................................................................................ 183
Ignore Router-ID for Some Best-Path Calculations............................................................................................. 184
Four-Byte AS Numbers............................................................................................................................................184
AS4 Number Representation.................................................................................................................................. 184
AS Number Migration.............................................................................................................................................. 186
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