Users Guide

Applying Egress Layer 3 ACLs (Control-Plane)..................................................................................................124
Configuring UDF ACL..................................................................................................................................................... 124
IP Prefix Lists....................................................................................................................................................................128
Configuration Task List for Prefix Lists................................................................................................................128
ACL Resequencing........................................................................................................................................................... 131
Resequencing an ACL or Prefix List......................................................................................................................132
Route Maps.......................................................................................................................................................................133
Chapter 8: Bidirectional Forwarding Detection (BFD)................................................................ 134
How BFD Works...............................................................................................................................................................134
BFD Packet Format...................................................................................................................................................135
BFD Sessions.............................................................................................................................................................. 136
BFD Three-Way Handshake.................................................................................................................................... 137
Session State Changes.............................................................................................................................................138
Important Points to Remember....................................................................................................................................138
Configure BFD.................................................................................................................................................................. 138
Configure BFD for Physical Ports..........................................................................................................................139
Configure BFD for Static Routes........................................................................................................................... 140
Configure BFD for OSPF..........................................................................................................................................143
Configure BFD for OSPFv3..................................................................................................................................... 147
Configure BFD for IS-IS........................................................................................................................................... 150
Configure BFD for BGP............................................................................................................................................152
Configure BFD for VRRP......................................................................................................................................... 158
Configuring Protocol Liveness.................................................................................................................................161
Troubleshooting BFD................................................................................................................................................. 161
Chapter 9: Border Gateway Protocol (BGP)............................................................................... 163
BGP IP version 4 (BGPv4) Overview......................................................................................................................... 163
BGP Autonomous Systems......................................................................................................................................163
AS4 Number Representation.................................................................................................................................. 165
Four-Byte AS Numbers............................................................................................................................................ 167
BGP router ID..............................................................................................................................................................167
Sessions and Peers....................................................................................................................................................167
Establish a Session.................................................................................................................................................... 167
BGP Attributes for selecting Best Path............................................................................................................... 168
Multiprotocol BGP..................................................................................................................................................... 173
BGP global and address family configuration......................................................................................................174
Implement BGP with Dell EMC Networking OS................................................................................................. 175
Configuration Information........................................................................................................................................178
Basic BGP configuration tasks..................................................................................................................................... 178
Prerequisite for configuring a BGP network....................................................................................................... 178
Restrictions..................................................................................................................................................................179
Enabling BGP.............................................................................................................................................................. 179
Enabling four-byte autonomous system numbers.............................................................................................. 181
Changing a BGP router ID........................................................................................................................................ 181
Configuring AS4 Number Representations..........................................................................................................182
Configuring a BGP peer............................................................................................................................................183
Example-Configuring BGP routing between peers............................................................................................184
BGP peer group..........................................................................................................................................................185
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Contents