如图所示，E-Trunk应用于CE接入网络时，在CE与双PE间实现链路保护。CE分别通过一条LACP模式的Eth-Trunk与PE1、PE2相连。这两个Eth-Trunk构成一个E-Trunk，在PE1与PE2之间实现链路聚合组的备份，提高网络可靠性。

具体实例设计如下图

具体配置：

<ce1>dis cu
#
sysname ce1
#
vlan batch 3 to 5
#
interface Vlanif4
#
interface Vlanif5
 ip address 10.1.3.254 255.255.255.0
#
interface MEth0/0/1
#
interface Eth-Trunk1
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094
 mode lacp-static
#
interface GigabitEthernet0/0/3
 eth-trunk 1
#
interface GigabitEthernet0/0/4
 eth-trunk 1
#
interface GigabitEthernet0/0/5
#
interface GigabitEthernet0/0/19
 eth-trunk 1
#
interface GigabitEthernet0/0/20
 eth-trunk 1
#
interface NULL0
#
ospf 1
 area 0.0.0.0
  network 10.1.3.0 0.0.0.255
#
return
<ce1> 

----------------------

[pe1]dis cu
#
sysname pe1
#
vlan batch 2 5
#
lacp e-trunk system-id 0001-0001-0001
lacp e-trunk priority 1

#
interface Vlanif1
#
interface Vlanif2
 ip address 10.1.1.254 255.255.255.0
#
interface Vlanif5
 ip address 10.1.3.253 255.255.255.0
#
interface MEth0/0/1
#
e-trunk 1
 priority 1
 peer-address 2.2.2.2 source-address 1.1.1.1
#
interface Eth-Trunk1
 shutdown
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094
 mode lacp-static
#
interface GigabitEthernet0/0/3
 shutdown
 eth-trunk 1
#
interface GigabitEthernet0/0/4
 shutdown
 eth-trunk 1
#
interface GigabitEthernet0/0/10
 port link-type trunk
 port trunk allow-pass vlan 2
#
interface NULL0
#
interface LoopBack1
 ip address 1.1.1.1 255.255.255.255
#
ospf 1
 area 0.0.0.0
  network 1.1.1.1 0.0.0.0
  network 10.1.1.0 0.0.0.255
  network 10.1.3.0 0.0.0.255
#
return
[pe1]  

----------------

<pe2>dis cu
#
sysname pe2
#
vlan batch 3 5
#
lacp e-trunk system-id 0001-0001-0001
lacp e-trunk priority 1
#
interface Vlanif1
#
interface Vlanif3
 ip address 10.1.2.254 255.255.255.0
#
interface Vlanif5
 ip address 10.1.3.252 255.255.255.0
#
interface MEth0/0/1
#
e-trunk 1
 priority 2
 peer-address 1.1.1.1 source-address 2.2.2.2
#
interface Eth-Trunk1
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094
 mode lacp-static
#
interface GigabitEthernet0/0/11
 port link-type trunk
 port trunk allow-pass vlan 3
#
interface GigabitEthernet0/0/19
 eth-trunk 1
#
interface GigabitEthernet0/0/20
 eth-trunk 1
#
interface GigabitEthernet0/0/24
#
interface NULL0
#
interface LoopBack1
 ip address 2.2.2.2 255.255.255.255
#
ospf 1
 area 0.0.0.0
  network 2.2.2.2 0.0.0.0
  network 10.1.2.0 0.0.0.255
  network 10.1.3.0 0.0.0.255
#
user-interface con 0
user-interface vty 0 4
#
return
<pe2> 

-----------------

<pe3>
<pe3>dis cu
#
sysname pe3
#
vlan batch 2 to 3
#
interface Vlanif1
#
interface Vlanif2
 ip address 10.1.1.1 255.255.255.0
#
interface Vlanif3
 ip address 10.1.2.1 255.255.255.0
#
interface MEth0/0/1
#
interface GigabitEthernet0/0/10
 port link-type trunk
 port trunk allow-pass vlan 2
#
interface GigabitEthernet0/0/11
 port link-type trunk
 port trunk allow-pass vlan 3
#
interface LoopBack1
 ip address 3.3.3.3 255.255.255.255
#
ospf 1
 area 0.0.0.0
  network 3.3.3.3 0.0.0.0
  network 10.1.2.0 0.0.0.255
  network 10.1.1.0 0.0.0.255
#
user-interface con 0
user-interface vty 0 4
#
return
<pe3> 

 2016.3.19.16:01 修正配置文件中的一个错误，感谢 简 的指出