设备是Catalyst8540 CSR 。配置了ISL.VLAN.BVI,并且采用了HSRP协议。这些例子中是用的是IP地址的保留地址，在拥护网络中使用时要更换成你们自己想要的合法IP地址。

实例一：

涉及到技术有: ISL VLAN GEC IRB 技术 ， Cisco 的ISL技术润许将任何快速以太口配置成中继端口。生成树协议可以在中继端口上探测到并打破环路。

具体情况如下：

快速以太口0/0/0划分了端口，然后在子端口上封状了ISL协议，而快速以太端口0/0/0作为中继端口，它上面的每个子端口连接到一个VLAN。在千兆以太端口上使用了GEC端口绑定技术和桥接技术，并在目标端口GEC1/0/0上配置了端口探测。

具体配置单如下：

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

shutdown

!

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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