Configuring IS-IS GR ···················································································································································· 148

Configuring BFD for IS-IS············································································································································· 149

Configuring IS-IS FRR ··················································································································································· 149

Configuration prerequisites ································································································································ 150

Configuration guidelines ···································································································································· 150

Configuring IS-IS FRR to automatically calculate a backup next hop ···························································· 150

Configuring IS-IS FRR using a routing policy ···································································································· 150

Displaying and maintaining IS-IS ······························································································································· 151

IS-IS configuration examples ······································································································································· 152

Basic IS-IS configuration example ····················································································································· 152

DIS election configuration example ··················································································································· 157

IS-IS route redistribution configuration example ······························································································ 161

IS-IS authentication configuration example······································································································· 165

IS-IS GR configuration example ························································································································· 167

BFD for IS-IS configuration example ·················································································································· 168

IS-IS FRR configuration example ························································································································ 171

Configuring BGP ····················································································································································· 174

Overview ······································································································································································· 174

BGP speaker and BGP peer ······························································································································· 174

BGP message types ············································································································································· 174

BGP path attributes ············································································································································· 175

BGP route selection ············································································································································· 179

BGP route advertisement rules ··························································································································· 179

BGP load balancing ············································································································································ 179

Settlements for problems in large-scale BGP networks ···················································································· 180

MP-BGP ································································································································································· 183

BGP configuration views ···································································································································· 184

Protocols and standards ····································································································································· 185

BGP configuration task list ·········································································································································· 186

Configuring basic BGP ················································································································································ 188

Enabling BGP ······················································································································································· 188

Configuring a BGP peer ····································································································································· 189

Configuring a BGP peer group ·························································································································· 190

Specifying the source interface for TCP connections ······················································································· 196

Generating BGP routes ················································································································································ 197

Injecting a local network ···································································································································· 197

Redistributing IGP routes····································································································································· 198

Controlling route distribution and reception ············································································································· 199

Configuring BGP route summarization ············································································································· 199

Advertising optimal routes in the IP routing table ···························································································· 201

Advertising a default route to a peer or peer group ······················································································· 201

Limiting routes received from a peer or peer group ························································································ 202

Configuring BGP route filtering policies ··········································································································· 203

Configuring BGP route dampening ··················································································································· 208

Controlling BGP path selection ··································································································································· 209

Specifying a preferred value for routes received ····························································································· 209

Configuring preferences for BGP routes ··········································································································· 210

Configuring the default local preference ·········································································································· 211

Configuring the MED attribute ··························································································································· 212

Configuring the NEXT_HOP attribute ················································································································ 216

Configuring the AS_PATH attribute ··················································································································· 218

Tuning and optimizing BGP networks ························································································································ 223

Configuring the keepalive interval and hold time ···························································································· 223