//// r1 ////
int lo0
ip ad 1.1.1.1 255.255.255.0
int e2/0
ip ad 192.1.1.1 255.255.255.0
router os 1
net 0.0.0.0
255.255.255.255
//宣告所有接口,内部路由协议IGP先将AS内路由打通
router bgp 65000
//启用BGP,注意此时为子AS号.
no
syn
//关闭同步.同步是一种过时的技术,当初是用来防止IGP不知道EGP路由条目的情况下做数据转发,会产生黑洞的问题应运而生的.同步的存在要求IGP路由协议必须知道所有EGP路由条目,这就要求将EGP路由条目全部重分发进IGP路由表.最初的网络规模较小,这也许算不上什么问题.但现在全球路由条目已经超过了18万,这样多的路由条目同时出现在一台普通的路由器上,只能说后果很严重了.曾经有过某省的核心骨路器因为错误地注入了EGP路由导致网络大规模断线4个小时的严重后果.
ps:现在我们要求统一关闭同步,并且所有路由器全互连!
neighbor 192.1.1.2 remote-as 65000
network 1.0.0.0
//// r2 ////
int lo0
ip ad 2.2.2.2 255.255.255.0
int e2/0
ip ad 192.1.1.2 255.255.255.0
int e3/0
ip ad 193.1.1.2 255.255.255.0
int e5/0
ip ad 195.1.1.2 255.255.255.0
router os 1
network 0.0.0.0 255.255.255.255 a
0 //宣告所有接口,注意掩码格式的意义
router bgp 65000
no syn //关闭同步
bgp confederation
identifier 200
bgp confederation
peers 65001
neighbor 192.1.1.1 remote-as 65000
neighbor 193.1.1.3 remote-as 65001
neighbor 193.1.1.3 next-hop-self
neighbor 195.1.1.4 remote-as 100
network 2.0.0.0
//// r3 ////
int lo0
ip ad 3.3.3.3 255.255.255.0
int e3/0
ip ad 193.1.1.3 255.255.255.0
int e4/0
ip ad 194.1.1.3 255.255.255.0
int e6/0
ip ad 196.1.1.3 255.255.255.0
router os 1
network 3.3.3.3 255.255.255.0
router bgp 65001
no syn
bgp confederation
identifier
200
//bgp联邦设置,标识出真正的AS
bgp confederation
peers
65000
//BGP联邦内部成员
neighbor 193.1.1.2 remote-as 65000
neighbor 193.1.1.2
next-hop-self
//从AS100学来的路由下一跳改为自已
neighbor 194.1.1.4 remote-as 65001
neighbor 196.1.1.4 remote-as 100
network 3.0.0.0
//// r4 ////
int lo0
ip ad 4.4.4.4 255.255.255.0
int e4/0
ip ad 194.1.1.4 255.255.255.0
router os 1
network 0.0.0.0 255.255.255.0 area 0
router bgp 65001
no syn
neighbor 194.1.1.3 remote-as 65001
network 4.0.0.0
//// r5 ////
int lo0
ip ad 5.5.5.5 255.255.255.0
int e5/0
ip ad 195.1.1.5 255.255.255.0
int e6/0
ip ad 196.1.1.5 255.255.255.0
router os 1
network 0.0.0.0 255.255.255.255 area
0
router bgp 65001
no syn
neighbor 195.1.1.2 remote-as 200
neighbor 196.1.1.3 remote-as 200
完成以上所有配置后,应看到1.0.0.0 - 5.0.0.0
所有网段都将出现在路由表内,通过PING测试后,全网全通才正确.具体show
ip bgp 以及 show ip ro内容有空我会发上来.
r1#sh ip bgp
Network
Next
Hop
Metric LocPrf Weight Path
*>
1.0.0.0
0.0.0.0
0
32768 i
*>i2.0.0.0
192.1.1.2
0
100
0 i
*>i3.0.0.0
193.1.1.3
0
100
0 (65001) i
*>i4.0.0.0
193.1.1.3
0
100
0 (65001) i
*>i5.0.0.0
195.1.1.5
0
100
0 100 i
r1#sh ip ro
1.0.0.0/24 is subnetted, 1 subnets
C
1.1.1.0 is directly connected, Loopback0
2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O
2.2.2.2/32 [110/11] via 192.1.1.2, 00:04:37, Ethernet1/0
B
2.0.0.0/8 [200/0] via 192.1.1.2, 00:04:52
3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O
3.3.3.3/32 [110/21] via 192.1.1.2, 00:04:37, Ethernet1/0
B
3.0.0.0/8 [200/0] via 193.1.1.3, 00:04:26
4.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O
4.4.4.4/32 [110/31] via 192.1.1.2, 00:04:37, Ethernet1/0
B
4.0.0.0/8 [200/0] via 193.1.1.3, 00:04:31
B 5.0.0.0/8
[200/0] via 195.1.1.5, 00:04:37
O
196.1.1.0/24 [110/84] via 192.1.1.2, 00:04:37, Ethernet1/0
O
193.1.1.0/24 [110/20] via 192.1.1.2, 00:04:38, Ethernet1/0
C
192.1.1.0/24 is directly connected, Ethernet1/0
O
195.1.1.0/24 [110/74] via 192.1.1.2, 00:04:39, Ethernet1/0
O
194.1.1.0/24 [110/30] via 192.1.1.2, 00:04:39, Ethernet1/0
r1#sh ip ro bgp
2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
B
2.0.0.0/8 [200/0] via 192.1.1.2, 00:05:21
3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
B
3.0.0.0/8 [200/0] via 193.1.1.3, 00:04:55
4.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
B
4.0.0.0/8 [200/0] via 193.1.1.3, 00:05:01
B 5.0.0.0/8
[200/0] via 195.1.1.5, 00:05:07
r5#sh ip bgp
Network
Next
Hop
Metric LocPrf Weight Path
*
1.0.0.0
195.1.1.2
0 200 i
*>
196.1.1.3
0 200 i
*
2.0.0.0
195.1.1.2
0
0 200 i
*>
196.1.1.3
0 200 i
*
3.0.0.0
195.1.1.2
0 200 i
*>
加载中…