Administrator Guide

IP Prefix Lists.................................................................................................................................................................... 116
Configuration Task List for Prefix Lists................................................................................................................ 116
ACL Remarks..................................................................................................................................................................... 119
Configuring a Remark............................................................................................................................................... 120
Deleting a Remark......................................................................................................................................................120
ACL Resequencing........................................................................................................................................................... 121
Resequencing an ACL or Prefix List.......................................................................................................................121
Route Maps.......................................................................................................................................................................122
Logging of ACL Processes............................................................................................................................................ 123
Guidelines for Configuring ACL Logging.............................................................................................................. 123
Configuring ACL Logging......................................................................................................................................... 124
Flow-Based Monitoring.................................................................................................................................................. 124
Enabling Flow-Based Monitoring........................................................................................................................... 126
Chapter 8: Bidirectional Forwarding Detection (BFD)................................................................ 128
How BFD Works...............................................................................................................................................................128
BFD Packet Format...................................................................................................................................................129
BFD Sessions.............................................................................................................................................................. 130
BFD Three-Way Handshake.....................................................................................................................................131
Session State Changes.............................................................................................................................................132
Important Points to Remember....................................................................................................................................132
Configure BFD.................................................................................................................................................................. 132
Configure BFD for Physical Ports..........................................................................................................................133
Configure BFD for Static Routes........................................................................................................................... 134
Configure BFD for IPv6 Static Routes................................................................................................................. 138
Configure BFD for OSPF......................................................................................................................................... 140
Configure BFD for OSPFv3..................................................................................................................................... 142
Configure BFD for IS-IS........................................................................................................................................... 145
Configure BFD for BGP............................................................................................................................................ 147
Configure BFD for VRRP......................................................................................................................................... 154
Configuring Protocol Liveness................................................................................................................................156
Chapter 9: Border Gateway Protocol (BGP)............................................................................... 157
BGP IP version 4 (BGPv4) Overview......................................................................................................................... 157
BGP Autonomous Systems......................................................................................................................................157
AS4 Number Representation.................................................................................................................................. 159
Four-Byte AS Numbers............................................................................................................................................. 161
BGP router ID.............................................................................................................................................................. 161
Sessions and Peers.................................................................................................................................................... 161
Establish a Session..................................................................................................................................................... 161
BGP Attributes for selecting Best Path............................................................................................................... 162
Multiprotocol BGP..................................................................................................................................................... 167
BGP global and address family configuration......................................................................................................168
Implement BGP with Dell EMC Networking OS................................................................................................. 169
Configuration Information........................................................................................................................................ 172
Basic BGP configuration tasks..................................................................................................................................... 173
Prerequisite for configuring a BGP network....................................................................................................... 173
Restrictions..................................................................................................................................................................173
Enabling BGP...............................................................................................................................................................173
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Contents