企业官网建设流程全解析

一 拓扑说明

R1、R2、R3通过ospf建立邻居，R1和R3通过非直连物理接口建立EBGP邻居

注意：默认情况下,BGP认为EBGP邻居是直连可达的。如果EBGP邻居间不是直连可达，则必须在BGP视图下配置允许同非直接相连网络上的邻居建立EBGP连接。

二 R1和R2设备配置

1.R1配置

bgp 100

peer 2.2.2.2 as-number 300

peer 2.2.2.2 ebgp-max-hop 255

#

address-family ipv4 unicast

network 192.168.1.1 255.255.255.255

peer 2.2.2.2 enable

2.R3配置

#

bgp 300

peer 1.1.1.1 as-number 100

peer 1.1.1.1 ebgp-max-hop 255

#

address-family ipv4 unicast

network 192.168.11.1 255.255.255.255

peer 1.1.1.1 enable

#

三 前后对比

3.1 R1、R3配置非直连ebgp邻居多条功能前-邻居无法建立-路由无法学习

<R1>dis bgp peer ipv4//邻居无法建立

BGP local router ID: 192.168.1.1

Local AS number: 100

Total number of peers: 1 Peers in established state: 0

* - Dynamically created peer

Peer AS MsgRcvd MsgSent OutQ PrefRcv Up/Down State

2.2.2.2 300 0 0 0 0 00:01:41 Connect

<R1>

<R1>

<R1>dis ip routing-table//没有bgp路由

Destinations : 12 Routes : 12

Destination/Mask Proto Pre Cost NextHop Interface

0.0.0.0/32 Direct 0 0 127.0.0.1 InLoop0

1.1.1.0/30 Direct 0 0 1.1.1.1 GE0/0

1.1.1.1/32 Direct 0 0 127.0.0.1 InLoop0

1.1.1.3/32 Direct 0 0 1.1.1.1 GE0/0

2.2.2.0/30 O_INTRA 10 2 1.1.1.2 GE0/0

127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0

127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0

127.255.255.255/32 Direct 0 0 127.0.0.1 InLoop0

192.168.1.1/32 Direct 0 0 127.0.0.1 InLoop0

224.0.0.0/4 Direct 0 0 0.0.0.0 NULL0

224.0.0.0/24 Direct 0 0 0.0.0.0 NULL0

255.255.255.255/32 Direct 0 0 127.0.0.1 InLoop0

<R1>

<R1>

<R1>dis bgp routing-table ipv4

Total number of routes: 1

BGP local router ID is 192.168.1.1

Status codes: * - valid, > - best, d - dampened, h - history,

s - suppressed, S - stale, i - internal, e - external

Origin: i - IGP, e - EGP, ? - incomplete

Network NextHop MED LocPrf PrefVal Path/Ogn

* > 192.168.1.1/32 127.0.0.1 0 32768 i

<R1>

3.2 R1、R3配置非直连ebgp邻居多条功能后-邻居正常建立-路由可以学习

<R1>dis bgp peer ipv4

BGP local router ID: 192.168.1.1

Local AS number: 100

Total number of peers: 1 Peers in established state: 1

* - Dynamically created peer

Peer AS MsgRcvd MsgSent OutQ PrefRcv Up/Down State

2.2.2.2 300 5 4 0 1 00:00:39 Established

<R1>

<R1>

<R1>dis ip routing-table

Destinations : 13 Routes : 13

Destination/Mask Proto Pre Cost NextHop Interface

0.0.0.0/32 Direct 0 0 127.0.0.1 InLoop0

1.1.1.0/30 Direct 0 0 1.1.1.1 GE0/0

1.1.1.1/32 Direct 0 0 127.0.0.1 InLoop0

1.1.1.3/32 Direct 0 0 1.1.1.1 GE0/0

2.2.2.0/30 O_INTRA 10 2 1.1.1.2 GE0/0

127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0

127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0

127.255.255.255/32 Direct 0 0 127.0.0.1 InLoop0

192.168.1.1/32 Direct 0 0 127.0.0.1 InLoop0

192.168.11.1/32 BGP 255 0 2.2.2.2 GE0/0

224.0.0.0/4 Direct 0 0 0.0.0.0 NULL0

224.0.0.0/24 Direct 0 0 0.0.0.0 NULL0

255.255.255.255/32 Direct 0 0 127.0.0.1 InLoop0

<R1>

<R1>dis bgp routing-table ipv4

Total number of routes: 2

BGP local router ID is 192.168.1.1

Status codes: * - valid, > - best, d - dampened, h - history,

s - suppressed, S - stale, i - internal, e - external

Origin: i - IGP, e - EGP, ? - incomplete

Network NextHop MED LocPrf PrefVal Path/Ogn

* > 192.168.1.1/32 127.0.0.1 0 32768 i

* >e 192.168.11.1/32 2.2.2.2 0 0 300i

<R1>