Concept Guide

Table Of Contents
Congure BFD for BGP.................................................................................................................................................155
Prerequisites..............................................................................................................................................................155
Establishing Sessions with BGP Neighbors.......................................................................................................... 155
Disabling BFD for BGP.............................................................................................................................................160
Use BFD in a BGP Peer Group............................................................................................................................... 160
Displaying BFD for BGP Information......................................................................................................................160
Congure BFD for VRRP...............................................................................................................................................164
Related Conguration Tasks....................................................................................................................................164
Establishing Sessions with All VRRP Neighbors...................................................................................................165
Establishing VRRP Sessions on VRRP Neighbors................................................................................................165
Changing VRRP Session Parameters.................................................................................................................... 166
Disabling BFD for VRRP.......................................................................................................................................... 166
Congure BFD for VLANs............................................................................................................................................. 167
Related Conguration Task......................................................................................................................................167
Establish Sessions with VLAN Neighbors............................................................................................................. 168
Changing VLAN Session Parameters.....................................................................................................................168
Disabling BFD for VLANs.........................................................................................................................................169
Congure BFD for Port-Channels................................................................................................................................169
Related Conguration Tasks....................................................................................................................................169
Establish Sessions on Port-Channels.....................................................................................................................170
Changing Physical Port Session Parameters........................................................................................................ 170
Disabling BFD for Port-Channels.............................................................................................................................171
Conguring Protocol Liveness....................................................................................................................................... 171
10 Border Gateway Protocol IPv4 (BGPv4)................................................................................................... 172
Autonomous Systems (AS)........................................................................................................................................... 172
Sessions and Peers.........................................................................................................................................................174
Establish a Session....................................................................................................................................................174
Route Reectors.............................................................................................................................................................175
Communities............................................................................................................................................................. 176
BGP Attributes................................................................................................................................................................176
Best Path Selection Criteria.................................................................................................................................... 176
Weight........................................................................................................................................................................178
Local Preference.......................................................................................................................................................178
Multi-Exit Discriminators (MEDs)...........................................................................................................................179
Origin..........................................................................................................................................................................180
AS Path.......................................................................................................................................................................181
Next Hop....................................................................................................................................................................181
Multiprotocol BGP...........................................................................................................................................................181
Implement BGP with the Dell Networking OS............................................................................................................182
Additional Path (Add-Path) Support......................................................................................................................182
Advertise IGP Cost as MED for Redistributed Routes........................................................................................ 182
Ignore Router-ID for Some Best-Path Calculations............................................................................................. 183
Four-Byte AS Numbers............................................................................................................................................183
AS4 Number Representation.................................................................................................................................. 183
AS Number Migration.............................................................................................................................................. 185
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