bgp+ipip组网

明白了，你要求的是 iBGP 和 eBGP 的示例都用三台机器，而且 eBGP 三台机器分别属于三个不同的 AS，完全分开。下面给出完整配置示例，包括 Linux IP 配置和 BIRD 配置，并提供拓扑说明。

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一、iBGP 示例（三台机器同 AS）

1️⃣ 拓扑

主机	物理 IP	Router ID	AS号
Linux-A	192.168.1.1	10.0.0.1	65001
Linux-B	192.168.1.2	10.0.0.2	65001
Linux-C	192.168.1.3	10.0.0.3	65001

IPIP 隧道（用于 iBGP 通告）：

隧道	源	目的	子网
ipip-A-B	192.168.1.1	192.168.1.2	10.1.1.0/24
ipip-A-C	192.168.1.1	192.168.1.3	10.1.2.0/24
ipip-B-C	192.168.1.2	192.168.1.3	10.1.3.0/24

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2️⃣ Linux IP 配置（iBGP）

Linux-A

ip addr add 192.168.1.1/24 dev eth0
ip link set eth0 up

ip tunnel add ipip-A-B mode ipip remote 192.168.1.2 local 192.168.1.1 dev eth0
ip addr add 10.1.1.1/24 dev ipip-A-B
ip link set ipip-A-B up

ip tunnel add ipip-A-C mode ipip remote 192.168.1.3 local 192.168.1.1 dev eth0
ip addr add 10.1.2.1/24 dev ipip-A-C
ip link set ipip-A-C up

Linux-B

ip addr add 192.168.1.2/24 dev eth0
ip link set eth0 up

ip tunnel add ipip-B-A mode ipip remote 192.168.1.1 local 192.168.1.2 dev eth0
ip addr add 10.1.1.2/24 dev ipip-B-A
ip link set ipip-B-A up

ip tunnel add ipip-B-C mode ipip remote 192.168.1.3 local 192.168.1.2 dev eth0
ip addr add 10.1.3.2/24 dev ipip-B-C
ip link set ipip-B-C up

Linux-C

ip addr add 192.168.1.3/24 dev eth0
ip link set eth0 up

ip tunnel add ipip-C-A mode ipip remote 192.168.1.1 local 192.168.1.3 dev eth0
ip addr add 10.1.2.3/24 dev ipip-C-A
ip link set ipip-C-A up

ip tunnel add ipip-C-B mode ipip remote 192.168.1.2 local 192.168.1.3 dev eth0
ip addr add 10.1.3.3/24 dev ipip-C-B
ip link set ipip-C-B up

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3️⃣ BIRD 配置（iBGP）

Linux-A

router id 10.0.0.1;

protocol kernel {
  persist;
  scan time 20;
  import all;
  export all;
}

protocol device {
  scan time 10;
}

protocol bgp iBGP-B {
  local as 65001;
  neighbor 10.1.1.2 as 65001;
  source address 10.1.1.1;
  import all;
  export all;
}

protocol bgp iBGP-C {
  local as 65001;
  neighbor 10.1.2.3 as 65001;
  source address 10.1.2.1;
  import all;
  export all;
}

Linux-B 和 Linux-C 类似，只修改 router id、local as 和 neighbor IP。

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二、eBGP 示例（三台机器跨三个不同 AS）

1️⃣ 拓扑

主机	物理 IP	Router ID	AS号
Linux-A	192.168.2.1	20.0.0.1	65001
Linux-B	192.168.2.2	20.0.0.2	65002
Linux-C	192.168.3.1	30.0.0.1	65003

IPIP 隧道（用于 eBGP 通告）：

隧道	源	目的	子网
ipip-A-B	192.168.2.1	192.168.2.2	10.2.1.0/24
ipip-A-C	192.168.2.1	192.168.3.1	10.2.2.0/24
ipip-B-C	192.168.2.2	192.168.3.1	10.2.3.0/24

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2️⃣ Linux IP 配置（eBGP）

Linux-A (AS 65001)

ip addr add 192.168.2.1/24 dev eth0
ip link set eth0 up

ip tunnel add ipip-A-B mode ipip remote 192.168.2.2 local 192.168.2.1 dev eth0
ip addr add 10.2.1.1/24 dev ipip-A-B
ip link set ipip-A-B up

ip tunnel add ipip-A-C mode ipip remote 192.168.3.1 local 192.168.2.1 dev eth0
ip addr add 10.2.2.1/24 dev ipip-A-C
ip link set ipip-A-C up

Linux-B (AS 65002)

ip addr add 192.168.2.2/24 dev eth0
ip link set eth0 up

ip tunnel add ipip-B-A mode ipip remote 192.168.2.1 local 192.168.2.2 dev eth0
ip addr add 10.2.1.2/24 dev ipip-B-A
ip link set ipip-B-A up

ip tunnel add ipip-B-C mode ipip remote 192.168.3.1 local 192.168.2.2 dev eth0
ip addr add 10.2.3.2/24 dev ipip-B-C
ip link set ipip-B-C up

Linux-C (AS 65003)

ip addr add 192.168.3.1/24 dev eth0
ip link set eth0 up

ip tunnel add ipip-C-A mode ipip remote 192.168.2.1 local 192.168.3.1 dev eth0
ip addr add 10.2.2.3/24 dev ipip-C-A
ip link set ipip-C-A up

ip tunnel add ipip-C-B mode ipip remote 192.168.2.2 local 192.168.3.1 dev eth0
ip addr add 10.2.3.3/24 dev ipip-C-B
ip link set ipip-C-B up

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3️⃣ BIRD 配置（eBGP）

Linux-A (AS 65001)

router id 20.0.0.1;

protocol kernel { persist; scan time 20; import all; export all; }
protocol device { scan time 10; }

protocol bgp eBGP-B {
  local as 65001;
  neighbor 10.2.1.2 as 65002;
  source address 10.2.1.1;
  import all; export all;
}

protocol bgp eBGP-C {
  local as 65001;
  neighbor 10.2.2.3 as 65003;
  source address 10.2.2.1;
  import all; export all;
}

Linux-B (AS 65002)

router id 20.0.0.2;

protocol kernel { persist; scan time 20; import all; export all; }
protocol device { scan time 10; }

protocol bgp eBGP-A {
  local as 65002;
  neighbor 10.2.1.1 as 65001;
  source address 10.2.1.2;
  import all; export all;
}

protocol bgp eBGP-C {
  local as 65002;
  neighbor 10.2.3.3 as 65003;
  source address 10.2.3.2;
  import all; export all;
}

Linux-C (AS 65003)

router id 30.0.0.1;

protocol kernel { persist; scan time 20; import all; export all; }
protocol device { scan time 10; }

protocol bgp eBGP-A {
  local as 65003;
  neighbor 10.2.2.1 as 65001;
  source address 10.2.2.3;
  import all; export all;
}

protocol bgp eBGP-B {
  local as 65003;
  neighbor 10.2.3.2 as 65002;
  source address 10.2.3.3;
  import all; export all;
}

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✅ 总结：

1. iBGP：三台机器在同一个 AS（65001），互相通告路由。

2. eBGP：三台机器分别属于 AS 65001、65002、65003，形成全互联跨 AS 通告。

3. IPIP 隧道用于承载 BGP 邻居通信。

4. Linux IP 和 BIRD 配置可直接按示例修改。

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