BGP 和 OSFP | 大雁Blogs

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所属分类：思科设备

摘要

边界网关协议（BGP）是运行于 TCP 上的一种自治系统的路由协议。 BGP 是唯一一个用来处理像因特网大小的网络的协议，也是唯一能够妥善处理好不相关路由域间的多路连接的协议。

ospf:要求设备和设备两两之间运行才行

bgp：可以跨设备之间进行传递（R2 可以不运行）

如果都使用ospf 中间的设备都有大量的路由条目。

速度快慢=== 转发延迟（经过每一次路由器停留时间查表-- 转发）

router bgp 100 //自治系统编号 == 本地编号一台设备只能启动一个编号（真实工作编号运营商分配）

R1(config-router)#neighbor 200.1.1.2 remote-as 100 //指定对端的gbp设备 对端的地址200.1.1.2 对端的编号也是100 
R1(config-router)#network  1.1.1.0 mask 255.255.255.0 //宣告网段

1 2	R1(config-router)#neighbor 200.1.1.2 remote-as 100 //指定对端的gbp设备对端的地址200.1.1.2 对端的编号也是100 R1(config-router)#network 1.1.1.0 mask 255.255.255.0 //宣告网段

R1 :

MPLS VPN --多协议标签交换技术

LFIB ---标签转发信息库

R1：

interface FastEthernet0/0 
ip address 100.1.1.1 255.255.255.0 
speed auto duplex auto
! 
interface FastEthernet0/1 
ip address 200.1.1.1 255.255.255.0 
speed auto duplex auto
! 
router ospf 1 
network 100.1.1.0 0.0.0.255 area 0 
network 200.1.1.0 0.0.0.255 area 0

interface FastEthernet0/0

ip address 100.1.1.1 255.255.255.0

speed auto duplex auto

interface FastEthernet0/1

ip address 200.1.1.1 255.255.255.0

speed auto duplex auto

router ospf 1

network 100.1.1.0 0.0.0.255 area 0

network 200.1.1.0 0.0.0.255 area 0

R2:

interface Loopback1 
ip address 5.5.5.5 255.255.255.0 
! 
interface FastEthernet0/0 
ip address 100.1.1.2 255.255.255.0 
speed auto duplex auto 
! 
router ospf 1 
network 100.1.1.0 0.0.0.255 area 0 
! 
router bgp 100 
bgp log-neighbor-changes 
network 5.5.5.0 mask 255.255.255.0 
neighbor 200.1.1.2 remote-as 100 
!

interface Loopback1

ip address 5.5.5.5 255.255.255.0

interface FastEthernet0/0

ip address 100.1.1.2 255.255.255.0

speed auto duplex auto

router ospf 1

network 100.1.1.0 0.0.0.255 area 0

router bgp 100

bgp log-neighbor-changes

network 5.5.5.0 mask 255.255.255.0

neighbor 200.1.1.2 remote-as 100

R3:

interface Loopback1 
ip address 6.6.6.6 255.255.255.0 
! 
interface FastEthernet0/0 
no ip address shutdown 
speed auto duplex auto 
! 
interface FastEthernet0/1 
ip address 200.1.1.2 255.255.255.0 
speed auto duplex auto 
! 
router ospf 1 
network 200.1.1.0 0.0.0.255 area 0 
! 
router bgp 100 
bgp log-neighbor-changes 
network 6.6.6.0 mask 255.255.255.0 
neighbor 100.1.1.2 remote-as 100

interface Loopback1

ip address 6.6.6.6 255.255.255.0

interface FastEthernet0/0

no ip address shutdown

speed auto duplex auto

interface FastEthernet0/1

ip address 200.1.1.2 255.255.255.0

speed auto duplex auto

router ospf 1

network 200.1.1.0 0.0.0.255 area 0

router bgp 100

bgp log-neighbor-changes

network 6.6.6.0 mask 255.255.255.0

neighbor 100.1.1.2 remote-as 100

R2 ping R3

R2#ping 6.6.6.6 source  100.1.1.2 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds: 
Packet sent with a source address of 100.1.1.2 
UUUUU 
Success rate is 0 percent (0/5)

R2#ping 6.6.6.6 source 100.1.1.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:

Packet sent with a source address of 100.1.1.2

UUUUU

Success rate is 0 percent (0/5)

R1 ping R2

R1#ping 5.5.5.5 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:
..... 
Success rate is 0 percent (0/5)

R1#ping 5.5.5.5 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)