Users Guide

Route Reflectors..................................................................................................................... 174

BGP Attributes......................................................................................................................... 175

Best Path Selection Criteria............................................................................................ 175

Weight................................................................................................................................. 178

Local Preference...............................................................................................................178

Multi-Exit Discriminators (MEDs)...................................................................................179

Origin.................................................................................................................................. 180

AS Path................................................................................................................................180

Next Hop.............................................................................................................................181

Multiprotocol BGP..................................................................................................................181

Implement BGP with Dell Networking OS........................................................................182

Additional Path (Add-Path) Support............................................................................. 182

Advertise IGP Cost as MED for Redistributed Routes............................................... 182

Ignore Router-ID in Best-Path Calculation.................................................................183

Four-Byte AS Numbers....................................................................................................183

AS4 Number Representation......................................................................................... 184

AS Number Migration...................................................................................................... 185

BGP4 Management Information Base (MIB)............................................................... 187

Important Points to Remember.....................................................................................187

Configuration Information................................................................................................... 188

BGP Configuration.................................................................................................................189

Enabling BGP.....................................................................................................................190

Configuring AS4 Number Representations.................................................................193

Configuring Peer Groups................................................................................................195

Configuring BGP Fast Fall-Over.................................................................................... 198

Configuring Passive Peering.......................................................................................... 199

Maintaining Existing AS Numbers During an AS Migration..................................... 200

Allowing an AS Number to Appear in its Own AS Path............................................ 201

Enabling Graceful Restart...............................................................................................202

Enabling Neighbor Graceful Restart............................................................................ 203

Filtering on an AS-Path Attribute..................................................................................204

Regular Expressions as Filters........................................................................................205

Redistributing Routes...................................................................................................... 207

Enabling Additional Paths...............................................................................................208

Configuring IP Community Lists...................................................................................208

Configuring an IP Extended Community List............................................................ 209

Filtering Routes with Community Lists........................................................................ 210

Manipulating the COMMUNITY Attribute.....................................................................211

Changing MED Attributes................................................................................................213

Changing the LOCAL_PREFERENCE Attribute...........................................................213

Configuring the local System or a Different System to be the Next Hop for

BGP-Learned Routes....................................................................................................... 214

9.10(0.1)