Administrator Guide

ManualsBrandsDell ManualsAccess PlatformsC9010 Modular Chassis Switch

Origin.............................................................................................................................................................................173

AS Path.........................................................................................................................................................................173

Next Hop...................................................................................................................................................................... 174

Multiprotocol BGP........................................................................................................................................................... 174

Implement BGP ............................................................................................................................................................... 174

Advertise IGP Cost as MED for Redistributed Routes..................................................................................... 175

Ignore Router-ID for Some Best-Path Calculations.......................................................................................... 175

Four-Byte AS Numbers............................................................................................................................................ 175

AS4 Number Representation...................................................................................................................................176

AS Number Migration................................................................................................................................................177

BGP4 Management Information Base (MIB)...................................................................................................... 178

Important Points to Remember.............................................................................................................................. 179

Configuration Information..............................................................................................................................................179

BGP Configuration.......................................................................................................................................................... 180

Enabling BGP.............................................................................................................................................................. 180

Configuring AS4 Number Representations..........................................................................................................183

Configuring Peer Groups......................................................................................................................................... 185

Configuring BGP Fast Fail-Over.............................................................................................................................187

Configuring Passive Peering................................................................................................................................... 188

Maintaining Existing AS Numbers During an AS Migration..............................................................................189

Allowing an AS Number to Appear in its Own AS Path.................................................................................... 190

Filtering on an AS-Path Attribute.......................................................................................................................... 190

Regular Expressions as Filters.................................................................................................................................191

Redistributing Routes............................................................................................................................................... 193

Enabling Additional Paths.........................................................................................................................................193

Configuring IP Community Lists.............................................................................................................................194

Configuring an IP Extended Community List...................................................................................................... 195

Filtering Routes with Community Lists.................................................................................................................195

Manipulating the COMMUNITY Attribute............................................................................................................196

Changing MED Attributes........................................................................................................................................ 197

Changing the LOCAL_PREFERENCE Attribute................................................................................................. 197

Configuring the local System or a Different System to be the Next Hop for BGP-Learned Routes....198

Changing the WEIGHT Attribute........................................................................................................................... 199

Enabling Multipath.....................................................................................................................................................199

Filtering BGP Routes.................................................................................................................................................199

Filtering BGP Routes Using Route Maps............................................................................................................ 200

Filtering BGP Routes Using AS-PATH Information........................................................................................... 201

Configuring BGP Route Reflectors....................................................................................................................... 201

Aggregating Routes..................................................................................................................................................202

Configuring BGP Confederations..........................................................................................................................202

Enabling Route Flap Dampening............................................................................................................................203

Changing BGP Timers..............................................................................................................................................205

Setting the extended timer.................................................................................................................................... 205

Enabling BGP Neighbor Soft-Reconfiguration...................................................................................................206

Enabling or disabling BGP neighbors.................................................................................................................... 207

Route Map Continue................................................................................................................................................ 208

Enabling MBGP Configurations................................................................................................................................... 208

Configure IPv6 NH Automatically for IPv6 Prefix Advertised over IPv4 Neighbor.................................. 209

BGP Regular Expression Optimization.......................................................................................................................209

Debugging BGP............................................................................................................................................................... 209

Contents