Default Chapter33

Chapter 1 Configuring BGP Routing39

Configuring BGP Routing39
Overview39
- Conventions in this Chapter39
Autonomous Systems40
Table 3: Conventions for BGP Terms40
BGP Peers and Neighbors41
BGP Session41
BGP Speaker41
Figure 1: BGP Peers41
Figure 2: Internal and External BGP42
IBGP and EBGP42
Interior Gateway Protocols42
BGP Messages43
Figure 3: Interior Gateway Protocols43
BGP Route44
Routing Information Base44
Table 4: Cease Notification Message Subcodes44
Prefixes and CIDR45
Figure 4: Routing Without CIDR46
Figure 5: Routing with CIDR46
Path Attributes46
Transit and Nontransit Service47
Ipv6 BGP Support48
- Exchange of Ipv6 Routing Information over TCP Ipv448
- Figure 6: Transit Service48
- Figure 7: Nontransit Service48
- Exchange of Ipv6 Routing Information over TCP Ipv649
- Figure 8: Ipv6 Routing over TCP Ipv449
- Figure 9: Ipv6 Routing over TCP Ipv649
- Link-Local Next Hops in MP-BGP Packets49
Platform Considerations50
References50
Features52
Basic Configuration53
- Enabling BGP Routing53
- Table 5: Commands Affecting BGP Globally54
- Table 6: Commands Affecting All Address Families in a VRF54
- Understanding BGP Command Scope54
- Peer Group55
- Table 7: Commands Affecting the Current Address Family55
- Table 8: Commands Affecting All Address Families for the Specified Peer or55
- Inheritance of Configuration Values56
- Table 9: Commands Affecting Only the Current Address Family for the Specified Peer or Peer Group56
- Table 10: Behavior of Neighbor Commands57
- Table 11: Inheritance from Other Commands58
- Limitations on Inheritance60
- Setting the BGP Identifier60
- Table 12: Commands that Do Not Override Inherited Outbound Policy60
- Configuring Neighbors61
- Figure 10: Configuring Neighbors61
Before You Configure BGP53
Configuration Tasks53
Configuring BGP Peer Groups62
Figure 11: BGP Peer Groups63
- Assigning a Description64
- Setting the Peer Type64
- Logging Neighbor State Changes65
- Specifying a Source Address for a BGP Session66
- Specifying Peers that Are Not Directly Connected67
- Table 13: Source Addresses and Default Next Hop Addresses for Various Configurations67
- Figure 12: Using EBGP-Multihop68
- Controlling the Number of Prefixes69
- Specifying a Single-Hop Connection for IBGP Peers69
- Removing Private as Numbers from Updates70
- Checking as Path Length71
- Enabling MD5 Authentication on a TCP Connection72
- Setting the Maximum Size of Update Messages73
- Setting Automatic Fallover74
- Setting Timers74
- Administrative Shutdown75
- Automatic Summarization of Routes75
- Configuring BGP for Overload Conditions76
- Enabling Route Storage in Adj-Ribs-Out Tables77
- Effects of Changing Outbound Policies78
- Configuring the Address Family79
- Enabling Lenient Behavior82
- Configuring Promiscuous Peers and Dynamic Peering83
- Configuring Passive Peers85
Advertising Routes86
- Prefixes Originating in an as86
- Figure 13: Prefixes Originating in an as87
- Advertising Best Routes88
- Figure 14: Redistributing Routes into BGP89
- Redistributing Routes into BGP89
- Redistributing Routes from BGP90
- Advertising Default Routes91
- Configuring a Default Route91
- Figure 15: Advertising a Default Route92
- Redistributing Default Routes92
- Setting a Static Default Route93
- Figure 16: Setting a Static Default Route94
- Setting the Minimum Interval between Routing Updates94
- Aggregating Routes95
- Figure 17: Configuring Aggregate Addresses95
- Advertising Inactive Routes98
- Verifying an as Path98
- Advertising Ipv4 Routes between Ipv6 BGP Peers99
- Advertising Routes Conditionally99
- Advertising a Route Only When Another Route Is Present102
- Figure 18: Advertising a Route When Another Route Is Present102
- Advertising a Route Only When Another Route Is Absent103
- Figure 19: Advertising a Route When Another Route Is Absent104
- Advertising a Default Route Only When Another Route Is Present105
Configuring BGP Routing Policy106
Figure 20: Advertising a Default Route When Another Route Is Present106
- Table 14: Commands that Create Match-And-Set Route Maps107
- Table 15: Clauses Supported in BGP Match-And-Set Route Maps107
- Types of BGP Route Maps107
- Table 16: Commands that Create Match-Only Route Maps108
- Table 17: Clauses Not Supported in BGP Route Maps108
- Applying Table Maps117
- Command117
- Table 18: Set Clauses Supported in Route Maps Applied with the Table-Map117
- Access Lists119
- Filtering Prefixes119
- Figure 21: Filtering with Access Lists120
- Figure 22: Filtering Routes with an Access List120
- Filtering as Paths with a Filter List123
- Figure 23: Filtering with AS-Path Access Lists124
- Figure 24: Assigning a Filter List125
- Filtering as Paths with a Route Map126
- Figure 25: Route Map Filtering127
- Configuring the Community Attribute128
- Table 19: Action Based on Well-Known Community Membership128
- Figure 26: Communities129
- Community Lists131
- Figure 27: Community Lists132
- Resetting a BGP Connection134
- Changing Policies Without Disruption135
- Soft Reconfiguration135
- Cooperative Route Filtering136
- Route-Refresh Capability136
- Configuring Route Flap Dampening138
- Global Route Flap Dampening138
- Policy-Based Route Flap Dampening140
- Policy Testing141
Selecting the Best Path142
- BGP Path Decision Algorithm143
- Configuring Next-Hop Processing143
- Figure 28: Configuring Next-Hop Processing144
- Next Hops144
- Figure 29: Next-Hop Behavior for Broadcast Multiaccess Media146
- Figure 30: Next-Hop Behavior for Nonbroadcast Multiaccess Media146
- Next-Hop-Self146
- Assigning a Weight to a Route148
- Figure 31: Assigning a Weight to a Neighbor Connection148
- Using the Neighbor Weight Command148
- Using a Route Map149
- Using an AS-Path Access List149
- Configuring the Local-Pref Attribute151
- Figure 32: Configuring the Local-Preference Attribute152
- Using the Bgp Default Local-Preference Command152
- Understanding the Origin Attribute153
- Using a Route Map to Set the Local Preference153
- Figure 33: the Origin Attribute154
- Table 20: Origin and as Path for Routes Viewed on Different Routers155
- Understanding the AS-Path Attribute156
- Configuring a Local as157
- Figure 34: AS-Path Attributes157
- Configuring the MED Attribute158
- Figure 35: Configuring the MED158
- Comparing MED Values Within a Confederation161
- Missing MED Values161
- Capability Negotiation162
- Cooperative Route Filtering163
- Dynamic Capability Negotiation163
- Four-Octet as Numbers164
- Graceful Restarts164
- Route Refresh168
Interactions between BGP and Igps169
- Synchronizing BGP with Igps169
- Disabling Synchronization170
- Figure 37: Disabling Synchronization171
- Setting the Administrative Distance for a Route172
- Table 21: Default Administrative Distances for Route Sources172
- Figure 38: Administrative Distances174
- Configuring Backdoor Routes175
- Figure 39: Administrative Distance and Synchronization175
- Figure 40: Backdoor Route176
- Setting the Maximum Number of Equal-Cost Multipaths176
Detecting Peer Reachability with BFD177
- BFD and BGP Graceful Restart179
Managing a Large-Scale as179
- Configuring a Confederation180
- Figure 41: a Fully Meshed Autonomous System181
- Figure 42: a Confederation of Subautonomous Systems182
- Configuring Route Reflectors184
- Figure 43: Simple Route Reflection185
- Figure 44: Route Reflection: Logical Redundancy185
- Route Reflection and Redundancy185
- Figure 45: Route Reflection: Physical and Logical Redundancy186
- Route Reflection and Looping186
- Figure 46: BGP Route Reflection187
Configuring BGP Multicasting189
- Monitoring BGP Multicast Services192
Using BGP Routes for Other Protocols192
Configuring BGP/MPLS Vpns193
Testing BGP Policies193
Monitoring BGP194
Multiprotocol Layer Switching235
- Multiprotocol Layer Switching236
MPLS Overview237

Chapter 2 MPLS Overview237

Chapter 3 Configuring MPLS303

Chapter 4 Monitoring MPLS351

Chapter 5 Configuring BGP-MPLS Applications415

Chapter 6 Layer 2 Services over MPLS Overview545

Chapter 7 Configuring Layer 2 Services over MPLS565

Chapter 8 Monitoring Layer 2 Services over MPLS599

Chapter 9 VPLS Overview611

Chapter 10 Configuring VPLS625

Chapter 11 Monitoring VPLS649

Chapter 12 VPWS Overview681

Chapter 13 Configuring VPWS693

Chapter 14 Monitoring VPWS707

Brand	Juniper
Model	BGP - CONFIGURATION GUIDE V 11.1.X
Category	Software
Language	English

Juniper BGP - CONFIGURATION GUIDE V 11.1.X User Manual

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