設備是Catalyst8540 CSR 。配置了ISL.VLAN.BVI,并且采用了HSRP協議。這些例子中是用的是IP地址的保留地址，在擁護網絡中使用時要更換成你們自己想要的合法IP地址。
實例：
涉及到技術有: ISL VLAN GEC IRB 技術 ， Cisco 的ISL技術潤許將任何快速以太口配置成中繼端口。生成樹協議可以在中繼端口上探測到并打破環路。
具體情況如下：
快速以太口0/0/0劃分了端口，然后在子端口上封狀了ISL協議，而快速以太端口0/0/0作為中繼端口，它上面的每個子端口連接到一個VLAN。在千兆以太端口上使用了GEC端口綁定技術和橋接技術，并在目標端口GEC1/0/0上配置了端口探測。
具體配置單如下：
version 12.0
no service pad
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
!
hostname Cat8540_Chinamobile
!
logging buffered 4096 debugging
enable password 7 0833595e08
!
facility-alarm core-temperature major 53
facility-alarm core-temperature minor 45
clock timezone pst -8
clock summer-time pdt recurring
redundancy
main-cpu
sync config startup
sync config running
ip subnet-zero
no ip domain-lookup
ip name-server 172.19.2.132
ip name-server 172.20.30.32
ip multicast-routing
ip dvmrp route-limit 20000
bridge irb
!
interface port-channel9
ip address 172.20.1.2 255.255.255.0
no ip directed-broadcast
ip pim dense-mode
hold-queue 300 in
!
interface FastEthernet0/0/0
no ip address
no ip directed-broadcast
no keepalive
!
interface FastEthernet0/0/0.128
ip address 172.18.16.10 255.255.255.0
ip helper-address 172.18.16.15
no ip redirects
no ip directed-broadcast
ip pim dense-mode
ip multicast ttl-threshold 1
encapsulation isl 128
ipx encapsulation ARPA
ipx network 96A44fff
!
interface FastEthernet0/0/0.199
ip address 172.18.17.15 255.255.255.0
ip helper-address 172.18.16.16
ip helper-address 172.18.16.17
ip helper-address 172.18.16.18
no ip redirects
no ip directed-broadcast
ip pim dense-mode
ip multicast ttl-threshold 1
encapsulation isl 199
!
interface FastEthernet0/0/0.201
ip address 172.18.18.10 255.255.255.0
ip helper-address 172.18.16.16
ip helper-address 172.18.16.17
ip helper-address 172.18.16.18
no ip redirects
no ip directe-broadcast
ip pim dense-mode
ip multicast ttl-threshold 1
encapsulation isl 201
!
interface FastEthernet0/0/1
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/2
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/3
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/4
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/5
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/6
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/7
no ip address
no ip directed-broadcast
no keepalive
hutdown
interface FastEthernet0/0/8
ip address 172.18.19.10 255.255.255.0
ip helper-address 172.18.16.16
ip helper-address 172.18.16.17
ip helper-address 172.18.16.18
no ip redirects
no ip directe-broadcast
ip pim dense-mode
ip multicast ttl-threshold 1
ip sdr listen
no keepalive
ipx network 95B12FFF
!
interface FastEthernet0/0/9
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/12
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/11
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/12
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/13
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/14
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface FastEthernet0/0/15
no ip address
no ip directed-broadcast
no keepalive
shutdown
!
interface GigabitEthernet1/0/0
snoop interface FastEthernet0/0/3 direction both
snoop interface FastEthernet0/0/4 direction both
snoop interface FastEthernet0/0/5 direction both
ip address 172.18.21.10 255.255.255.0
ip helper-address 172.18.16.19
ip helper-address 172.18.16.20
ip helper-address 172.18.16.21
!
interface GigabitEthernet1/0/1
no ip address
no ip directed-broadcast
no keepalive
interface GigabitEthernet2/0/0
ip address 172.18.1.1 255.255.255.0
no ip directed-broadcast
ip pim sparse-dense-mode
!
interface GigabitEthernet2/0/1
ip address 172.19.1.1 255.255.255.0
no ip directed-broadcast
ip pim sparse-dense-mode
!
interface GigabitEthernet3/0/0
no ip address
no ip directed-broadcast
channel-group 9
!
interface GigabitEthernet3/0/1
no ip address
no ip directed-broadcast
channel-group 9
!
interface GigabitEthernet3/0/2
no ip address
no ip directed-broadcast
channel-group 9
!
interface GigabitEthernet3/0/3
no ip address
no ip directed-broadcast
channel-group 9
!
interface GigabitEthernet3/0/4
no ip address
no ip directed-broadcast
channel-group 9
!
interface GigabitEthernet3/0/5
no ip address
no ip directed-broadcast
channel-group 9
!
interface GigabitEthernet3/0/6
no ip address
no ip directed-broadcast
channel-group 9
!
interface GigabitEthernet3/0/7
no ip address
no ip directed-broadcast
channel-group 9
!
interface BVI1
ip address 172.20.1.2 255.255.255.0
no ip directed-broadcast
no ip route-cache cef
!
interface Ethernet0
ip address 172.18.20.10 255.255.255.0
no ip directed-broadcast
!
router eigrp 170
network 172.20.0.0
network 172.21.0.0
network 172.18.0.0
network 172.19.0.0
no auto-summary
!
router bgp 180
network 172.18.1.0
network 172.19.1.0
no auto-summary
!
ip classless
!
bridge 1 protocol ieee
bridge 1 route ip
bridge 1 route ipx
!
!
ip http server
!
line con 0
line aux 0
line vtp 0 4
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