Administrator Guide

Example of viewing IP mirror–access–group applied to an Interface................................................................... 119
7 Bidirectional Forwarding Detection (BFD)................................................................................... 120
How BFD Works.................................................................................................................................................................120
BFD Packet Format...................................................................................................................................................... 121
BFD Sessions................................................................................................................................................................ 122
BFD Three-Way Handshake....................................................................................................................................... 123
Session State Changes................................................................................................................................................124
Important Points to Remember........................................................................................................................................124
Configure BFD....................................................................................................................................................................124
Configure BFD for Physical Ports..............................................................................................................................125
Configure BFD for Static Routes............................................................................................................................... 126
Configure BFD for IPv6 Static Routes...................................................................................................................... 129
Configure BFD for OSPF............................................................................................................................................. 131
Configure BFD for OSPFv3........................................................................................................................................ 135
Configure BFD for IS-IS...............................................................................................................................................137
Configure BFD for BGP...............................................................................................................................................139
Configure BFD for VRRP............................................................................................................................................ 146
Configuring Protocol Liveness....................................................................................................................................148
8 Border Gateway Protocol (BGP).................................................................................................149
BGP IP version 4 (BGPv4) Overview..............................................................................................................................149
BGP Autonomous Systems.........................................................................................................................................149
AS4 Number Representation...................................................................................................................................... 151
Four-Byte AS Numbers...............................................................................................................................................153
BGP router ID............................................................................................................................................................... 153
Sessions and Peers...................................................................................................................................................... 153
Establish a Session.......................................................................................................................................................153
BGP Attributes for selecting Best Path.................................................................................................................... 154
Multiprotocol BGP....................................................................................................................................................... 159
BGP global and address family configuration...........................................................................................................160
Implement BGP with Dell EMC Networking OS....................................................................................................... 161
Configuration Information........................................................................................................................................... 164
Basic BGP configuration tasks.........................................................................................................................................164
Prerequisite for configuring a BGP network.............................................................................................................164
Restrictions................................................................................................................................................................... 164
Enabling BGP................................................................................................................................................................164
Enabling four-byte autonomous system numbers................................................................................................... 166
Changing a BGP router ID...........................................................................................................................................167
Configuring AS4 Number Representations...............................................................................................................167
Configuring a BGP peer.............................................................................................................................................. 168
Example-Configuring BGP routing between peers..................................................................................................169
BGP peer group............................................................................................................................................................170
Advanced BGP configuration tasks................................................................................................................................. 177
Route-refresh and Soft-reconfiguration................................................................................................................... 177
Aggregating Routes..................................................................................................................................................... 179
Filtering BGP..................................................................................................................................................................181
Configuring BGP Fast Fall-Over.................................................................................................................................186
Configuring Passive Peering....................................................................................................................................... 187
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