Service Manual

Configure Route Map Filters........................................................................................... 171
Configuring Match Routes..............................................................................................172
Configuring Set Conditions............................................................................................ 173
Configure a Route Map for Route Redistribution...................................................... 175
Configure a Route Map for Route Tagging.................................................................175
Continue Clause............................................................................................................... 176
9 Bidirectional Forwarding Detection (BFD).......................................................................177
How BFD Works......................................................................................................................178
BFD Packet Format.................................................................................................................179
BFD Sessions............................................................................................................................181
BFD Three-Way Handshake................................................................................................. 181
Session State Changes.......................................................................................................... 183
Important Points to Remember.....................................................................................183
Configure BFD........................................................................................................................ 184
Configure BFD for Physical Ports..................................................................................184
Configure BFD for Static Routes................................................................................... 187
Configure BFD for OSPF................................................................................................. 189
Configure BFD for IS-IS...................................................................................................193
Configure BFD for BGP................................................................................................... 196
Configuring Protocol Liveness......................................................................................203
Troubleshooting BFD............................................................................................................203
10 Border Gateway Protocol IPv4 (BGPv4)........................................................................ 205
Autonomous Systems (AS)...................................................................................................206
Sessions and Peers................................................................................................................ 209
Establish a Session........................................................................................................... 209
Route Reflectors.....................................................................................................................210
Communities........................................................................................................................... 211
BGP Attributes..........................................................................................................................211
Best Path Selection Criteria.............................................................................................211
Weight.......................................................................................................................................213
Local Preference.....................................................................................................................214
Multi-Exit Discriminators (MEDs)...................................................................................214
Origin.........................................................................................................................................215
AS Path......................................................................................................................................216
Next Hop.................................................................................................................................. 216
Multiprotocol BGP..................................................................................................................217
Implement BGP with Dell Networking OS........................................................................ 217
Additional Path (Add-Path) Support..............................................................................217
Advertise IGP Cost as MED for Redistributed Routes............................................... 218
Ignore Router-ID for Some Best-Path Calculations................................................. 219
8