Users Guide

Configure Route Map Filters.......................................................................................... 170
Configuring Match Routes.............................................................................................. 171
Configuring Set Conditions............................................................................................ 172
Configure a Route Map for Route Redistribution...................................................... 174
Configure a Route Map for Route Tagging.................................................................174
Continue Clause................................................................................................................175
9 Bidirectional Forwarding Detection (BFD).......................................................................176
How BFD Works...................................................................................................................... 177
BFD Packet Format.................................................................................................................178
BFD Sessions........................................................................................................................... 180
BFD Three-Way Handshake.................................................................................................180
Session State Changes.......................................................................................................... 182
Important Points to Remember.....................................................................................182
Configure BFD.........................................................................................................................183
Configure BFD for Physical Ports..................................................................................183
Configure BFD for Static Routes................................................................................... 186
Configure BFD for OSPF................................................................................................. 188
Configure BFD for IS-IS...................................................................................................192
Configure BFD for BGP................................................................................................... 195
Configuring Protocol Liveness......................................................................................202
Troubleshooting BFD............................................................................................................202
10 Border Gateway Protocol IPv4 (BGPv4)........................................................................204
Autonomous Systems (AS)...................................................................................................205
Sessions and Peers................................................................................................................ 208
Establish a Session........................................................................................................... 208
Route Reflectors.................................................................................................................... 209
Communities...........................................................................................................................210
BGP Attributes.........................................................................................................................210
Best Path Selection Criteria............................................................................................210
Weight.......................................................................................................................................212
Local Preference.....................................................................................................................213
Multi-Exit Discriminators (MEDs)...................................................................................213
Origin........................................................................................................................................ 214
AS Path......................................................................................................................................215
Next Hop.................................................................................................................................. 215
Multiprotocol BGP..................................................................................................................216
Implement BGP with Dell Networking OS........................................................................216
Additional Path (Add-Path) Support............................................................................. 216
Advertise IGP Cost as MED for Redistributed Routes................................................217
Ignore Router-ID for Some Best-Path Calculations................................................. 218
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