【资料名称】：BGP-Case-Studies

【资料作者】：cisco

【资料日期】：2000

【资料语言】：英文

【资料格式】：PDF

【资料目录和简介】：

1.0 Introduction..............................................................................................................4
1.1 How does BGP work ...........................................................................................................4
1.2 What are peers (neighbors) ..................................................................................................4
1.3 Information exchange between peers...................................................................................4
2.0 EBGP and IBGP ......................................................................................................5
3.0 Enabling BGP routing..............................................................................................6
3.1 BGP Neighbors/Peers ..........................................................................................................7
4.0 BGP and Loopback interfaces ...............................................................................10
5.0 EBGP Multihop .....................................................................................................11
5.1 EBGP Multihop (Load Balancing) ....................................................................................12
6.0 Route Maps ............................................................................................................13
7.0 Network command.................................................................................................17
7.1 Redistribution....................................................................................................................18
7.2 Static routes and redistribution ..........................................................................................20
8.0 Internal BGP ..........................................................................................................22
9.0 The BGP decision algorithm..................................................................................23
10.0 As_path Attribute...................................................................................................24
11.0 Origin Attribute......................................................................................................25
12.0 BGP Nexthop Attribute..........................................................................................27
12.1 BGP Nexthop (Multiaccess Networks)..............................................................................29
12.2 BGP Nexthop (NBMA) .....................................................................................................30
12.3 Next-hop-self .....................................................................................................................31
13.0 BGP Backdoor .......................................................................................................32
14.0 Synchronization .....................................................................................................34
14.1 Disabling synchronization .................................................................................................35
15.0 Weight Attribute.....................................................................................................37
16.0 Local Preference Attribute.....................................................................................39
17.0 Metric Attribute .....................................................................................................41
18.0 Community Attribute.............................................................................................44
19.0 BGP Filtering .........................................................................................................45
19.1 Route Filtering ...................................................................................................................45
19.2 Path Filtering......................................................................................................................47
19.2.1 AS-Regular Expression .......................................................................................49
19.3 BGP Community Filtering.................................................................................................50
20.0 BGP Neighbors and Route maps ...........................................................................53
20.1 Use of set as-path prepend .................................................................................................55
20.2 BGP Peer Groups...............................................................................................................56
21.0 CIDR and Aggregate Addresses ............................................................................58
1/26/96-Rev: A1.2 Page 3 Sam Halabi-cisco Systems
21.1 Aggregate Commands........................................................................................................59
21.2 CIDR example 1 ................................................................................................................61
21.3 CIDR example 2 (as-set)....................................................................................................63
22.0 BGP Confederation................................................................................................65
23.0 Route Reflectors.....................................................................................................68
23.1 Multiple RRs within a cluster ............................................................................................71
23.2 RR and conventional BGP speakers ..................................................................................73
23.3 Avoiding looping of routing information...........................................................................74
24.0 Route Flap Dampening ..........................................................................................75
25.0 How BGP selects a Path ........................................................................................79
26.0 Practical design example: ......................................................................................80