CISCO路由器配置手冊－第五章 虛擬局域網(wǎng)（VLAN）路由
一、虛擬局域網(wǎng)(VLAN) 當(dāng)前在我們構(gòu)造企業(yè)網(wǎng)絡(luò)時(shí)所采用的主干網(wǎng)絡(luò)技術(shù)一般都是基于交換和虛擬網(wǎng)絡(luò)的。交換技術(shù)將共享介質(zhì)改為獨(dú)占介質(zhì),大大提高網(wǎng)絡(luò)速度。虛擬網(wǎng)絡(luò)技術(shù)打破了地理環(huán)境的制約,在不改動(dòng)網(wǎng)絡(luò)物理連接的情況下可以任意將工作站在工作組或子網(wǎng)之間移動(dòng),工作站組成邏輯工作組或虛擬子網(wǎng),提高信息系統(tǒng)的運(yùn)作性能,均衡網(wǎng)絡(luò)數(shù)據(jù)流量,合理利用硬件及信息資源。同時(shí),利用虛擬網(wǎng)絡(luò)技術(shù),大大減輕了網(wǎng)絡(luò)管理和維護(hù)工作的負(fù)擔(dān),降低網(wǎng)絡(luò)維護(hù)費(fèi)用。隨著虛擬網(wǎng)絡(luò)技術(shù)的應(yīng)用，隨之必然產(chǎn)生了在虛擬網(wǎng)間如何通訊的問題．
二、交換機(jī)間鏈路（ISL）協(xié)議 ISL(Interior Switching Link)協(xié)議用于實(shí)現(xiàn)交換機(jī)間的VLAN中繼。它是一個(gè)信息包標(biāo)記協(xié)議，在支持ISL接口上發(fā)送的幀由一個(gè)標(biāo)準(zhǔn)以太網(wǎng)幀及相關(guān)的VLAN信息組成。如下圖所示，在支持ISL的接口上可以傳送來自不同VLAN的數(shù)據(jù)。
三、虛擬局域網(wǎng)（VLAN）路由實(shí)例 3.1. 例一：
設(shè)備選用Catalyst5500交換機(jī)1臺(tái)，安裝WS-X5530-E3管理引擎，多塊WS-X5225R及WS-X5302路由交換模塊,WS-X5302被直接插入交換機(jī)，通過二個(gè)通道與系統(tǒng)背板上的VLAN 相連，從用戶角度看認(rèn)為它是1個(gè)1接口的模塊，此接口支持ISL。在交換機(jī)內(nèi)劃有3個(gè)虛擬網(wǎng)，分別名為default、qbw、rgw，通過WS-X5302實(shí)現(xiàn)虛擬網(wǎng)間路由。
以下加重下橫線部分，如set system name 5500C為需設(shè)置的命令。
設(shè)置如下：
Catalyst 5500配置：
begin
set password $1$FMFQ$HfZR5DUszVHIRhrz4h6V70
set enablepass $1$FMFQ$HfZR5DUszVHIRhrz4h6V70
set prompt Console>
set length 24 default
set logout 20
set banner motd ^C^C
!
#system
set system baud 9600
set system modem disable
set system name 5500C
set system location
set system contact
!
#ip
set interface sc0 1 10.230.4.240 255.255.255.0 10.230.4.255
set interface sc0 up
set interface sl0 0.0.0.0 0.0.0.0
set interface sl0 up
set arp agingtime 1200
set ip redirect enable
set ip unreachable enable
set ip fragmentation enable
set ip route 0.0.0.0 10.230.4.15 1
set ip alias default 0.0.0.0
!
#Command alias
!
#vtp
set vtp domain hne
set vtp mode server
set vtp v2 disable
set vtp pruning disable
set vtp pruneeligible 2-1000
clear vtp pruneeligible 1001-1005
set vlan 1 name default type ethernet mtu 1500 said 100001 state active
set vlan 777 name rgw type ethernet mtu 1500 said 100777 state active
set vlan 888 name qbw type ethernet mtu 1500 said 100888 state active
set vlan 1002 name fddi-default type fddi mtu 1500 said 101002 state active
set vlan 1004 name fddinet-default type fddinet mtu 1500 said 101004 state active bridge 0x0 stp ieee
set vlan 1005 name trnet-default type trbrf mtu 1500 said 101005 state active bridge 0x0 stp ibm
set vlan 1003 name token-ring-default type trcrf mtu 1500 said 101003 state active parent 0 ring 0x0 mode srb aremaxhop 7 stemaxhop 7
!
#set boot command
set boot config-register 0x102
set boot system flash bootflash:cat5000-sup3.4-3-1a.bin
!
#module 1 : 2-port 1000BaseLX Supervisor
set module name 1
set vlan 1 1/1-2
set port enable 1/1-2
!
#module 2 : empty
!
#module 3 : 24-port 10/100BaseTX Ethernet
set module name 3
set module enable 3
set vlan 1 3/1-22
set vlan 777 3/23
set vlan 888 3/24
set trunk 3/1 on isl 1-1005
#module 4 empty
!
#module 5 empty
!
#module 6 : 1-port Route Switch
set module name 6
set port level 6/1 normal
set port trap 6/1 disable
set port name 6/1
set cdp enable 6/1
set cdp interval 6/1 60
set trunk 6/1 on isl 1-1005
!
#module 7 : 24-port 10/100BaseTX Ethernet
set module name 7
set module enable 7
set vlan 1 7/1-22
set vlan 888 7/23-24
set trunk 7/1 on isl 1-1005
set trunk 7/2 on isl 1-1005
!
#module 8 empty
!
#module 9 empty
!
#module 10 : 12-port 100BaseFX MM Ethernet
set module name 10
set module enable 10
set vlan 1 10/1-12
set port channel 10/1-4 off
set port channel 10/5-8 off
set port channel 10/9-12 off
set port channel 10/1-2 on
set port channel 10/3-4 on
set port channel 10/5-6 on
set port channel 10/7-8 on
set port channel 10/9-10 on
set port channel 10/11-12 on
#module 11 empty
!
#module 12 empty
!
#module 13 empty
!
#switch port analyzer
!set span 1 1/1 both inpkts disable
set span disable
!
#cam
set cam agingtime 1-2,777,888,1003,1005 300
end
5500C> (enable)
WS-X5302路由模塊設(shè)置：
Router#wri t
Building configuration...
Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname Router
!
enable secret 5 $1$w1kK$AJK69fGOD7BqKhKcSNBf6.
!
ip subnet-zero
!
interface Vlan1
ip address 10.230.2.56 255.255.255.0
!
interface Vlan777
ip address 10.230.3.56 255.255.255.0
!
interface Vlan888
ip address 10.230.4.56 255.255.255.0
!
no ip classless
!
line con 0
line aux 0
line vty 0 4
password router
login
!
end
Router#
