由浅入深玩转华为WLAN—20 漫游系列（8）不同AC之间三层漫游
转载自微信公众号：网络之路博客
三层漫游数据包的过程（隧道转发模式下）
漫游前数据包的走向
1、STA发送数据报文给HAP
2、HAP通过CAPWAP隧道把报文发送给HAC
3、HAC收到以后把业务报文送给上层设备处理转发
漫游后数据包的走向
1、STA发送数据报文给FAP
2、FAP通过CAPWAP隧道把报文发送给FAC
3、FAC通过AC间的隧道把报文发送给HAC
4、HAC把报文送往上层设备处理转发
可以看到其实数据包最终还是由原来的AC处理，而FAC只是做了个代理通过AC之间的隧道来把数据包交给AC。
三层漫游数据包的过程（直接转发模式下）
在AC间三层漫游的直接转发比较麻烦，而且处理过程比隧道转发还要多。
漫游前的数据转发
1、STA发送数据包报文给HAP
2、HAP收到以后把数据包交给HAC（如果是旁挂模式，则直接交给对应VLAN的网关设备处理来路由到需要去的目的地）
3、HAC收到以后把数据报文交给上层设备处理转发
漫游后的数据转发
1、STA把数据包转发给FAP
2、FAP收到报文后，交给HAC处理（如果旁挂模式，必须将该业务的数据包由FAC处理，否则漫游后的数据包不通）
3、FAC收到后，把数据包从AC间的隧道发送给HAC
4、HAC收到后，把报文转发给HAP
5、HAP在将数据报文按正常的方式转发
可以看到三层漫游的直接转发非常麻烦，通常情况下，我们理解直接转发的处理过程肯定比隧道转发要简便，但是在三层AC间漫游的过程中，确变得比较复杂，所以在三层AC间漫游的情况下，建议用隧道方式相比更加简单些。
家乡代理的作用
其实可以看到在三层直接转发的模式下相比来说非常繁琐，而家乡代理的作用就是减轻HAP的负担，它可以指定HAC直接转发数据包，省去了FAC把数据包通过隧道发给HAC的时候，在发给HAP做转发的过程。
拓扑介绍
这里是官方给出的拓扑，这里主要重点在于两边的业务VLAN都是同一个，但是AC_1提供的在192.168.101.0/24网段，而AC_2的网段则提供在192.168.102.0/24网段，VLAN ID相同，但网段不一样，这个其实也是属于三层漫游的。
说明：这里还是以官方给的拓扑做介绍，ENSP目前无法支持AC间漫游，所以这里无法演示。
Switch_1配置
[SW1] vlan batch 100 101
[SW1] interface gigabitethernet 0/0/1
[SW1-GigabitEthernet0/0/1] port link-type trunk
[SW1-GigabitEthernet0/0/1] port trunk pvid vlan 100
[SW1-GigabitEthernet0/0/1] port trunk allow-pass vlan 100 101
[SW1-GigabitEthernet0/0/1] quit
[SW1] interface gigabitethernet 0/0/2
[SW1-GigabitEthernet0/0/2] port link-type trunk
[SW1-GigabitEthernet0/0/2] port trunk allow-pass vlan 100 101
[SW1-GigabitEthernet0/0/2] quit
Switch_2配置
[SW2] vlan batch 100 101
[SW2] interface gigabitethernet 0/0/1
[SW2-GigabitEthernet0/0/1] port link-type trunk
[SW2-GigabitEthernet0/0/1] port trunk pvid vlan 100
[SW2-GigabitEthernet0/0/1] port trunk allow-pass vlan 100 101
[SW2-GigabitEthernet0/0/1] quit
[SW2] interface gigabitethernet 0/0/2
[SW2-GigabitEthernet0/0/2] port link-type trunk
[SW2-GigabitEthernet0/0/2] port trunk allow-pass vlan 100 101
[SW2-GigabitEthernet0/0/2] quit
AC-1的配置（只包含AP上线以及WLAN业务配置）
[AC_1] dhcp enable
[AC_1] vlan batch 100 101
[AC_1] interface gigabitethernet 0/0/1
[AC_1-GigabitEthernet0/0/1] port link-type trunk
[AC_1-GigabitEthernet0/0/1] port trunk allow-pass vlan 100 101
[AC_1-GigabitEthernet0/0/1] quit
[AC_1] interface gigabitethernet 0/0/2
[AC_1-GigabitEthernet0/0/2] port link-type trunk
[AC_1-GigabitEthernet0/0/2] port trunk allow-pass vlan 100 101
[AC_1-GigabitEthernet0/0/2] quit
[AC_1] interface vlanif 100
[AC_1-vlanif100] ip address 192.168.100.1 255.255.255.0
[AC_1-vlanif100] dhcp select interface
[AC_1-vlanif100] dhcp server excluded-ip-address 192.168.100.2
[AC_1-vlanif100] quit
[AC_1] interface vlanif 101
[AC_1-vlanif101] ip address 192.168.101.1 255.255.255.0
[AC_1-vlanif101] dhcp select interface
[AC_1-vlanif101] quit
[AC_1] interface wlan-ess 1
[AC_1-Wlan-Ess1] port hybrid pvid vlan 101
[AC_1-Wlan-Ess1] port hybrid untagged vlan 101
[AC_1] wlan
[AC_1-wlan-view] wlan ac source interface vlanif 100
[AC_1-wlan-view] ap id 1 type-id 19 mac 60de-4476-e360
[AC_1-wlan-view] wmm-profile name wmm id 1
[AC_1-wlan-wmm-prof-wmm] quit
[AC_1-wlan-view] radio-profile name radio id 1
[AC_1-wlan-radio-prof-radio] wmm-profile name wmm
[AC_1-wlan-radio-prof-radio] quit
[AC_1-wlan-view] security-profile name security id 1
[AC_1-wlan-sec-prof-security] quit
[AC_1-wlan-view] traffic-profile name traffic id 1
[AC_1-wlan-traffic-prof-traffic] quit
[AC_1-wlan-view] service-set name huawei1 id 1
[AC_1-wlan-service-set-huawei1] ssid huawei1
[AC_1-wlan-service-set-huawei1] wlan-ess 1
[AC_1-wlan-service-set-huawei1] security-profile name security
[AC_1-wlan-service-set-huawei1] traffic-profile name traffic
[AC_1-wlan-service-set-huawei1] service-vlan 101
[AC_1-wlan-service-set-huawei1] vlan-mobility-group 101 （必须）
[AC_1-wlan-service-set-huawei1] forward-mode tunnel
[AC_1-wlan-service-set-huawei1] quit
AC-2的配置（只包含AP上线以及WLAN业务配置）
[AC_2] dhcp enable
[AC_2] vlan batch 100 101
[AC_2] interface gigabitethernet 0/0/1
[AC_2-GigabitEthernet0/0/1] port link-type trunk
[AC_2-GigabitEthernet0/0/1] port trunk allow-pass vlan 100 101
[AC_2-GigabitEthernet0/0/1] quit
[AC_2] interface gigabitethernet 0/0/2
[AC_2-GigabitEthernet0/0/2] port link-type trunk
[AC_2-GigabitEthernet0/0/2] port trunk allow-pass vlan 100 101
[AC_2-GigabitEthernet0/0/2] quit
[AC_2] interface vlanif 100
[AC_2-vlanif100] ip address 192.168.100.2 255.255.255.0
[AC_2] interface vlanif 101
[AC_2-vlanif101] ip address 192.168.102.1 255.255.255.0
[AC_2-vlanif101] dhcp select interface
[AC_2] interface wlan-ess 1
[AC_2-Wlan-Ess1] port hybrid pvid vlan 101
[AC_2-Wlan-Ess1] port hybrid untagged vlan 101
[AC_2] wlan
[AC_2-wlan-view] wlan ac source interface vlanif 100
[AC_2-wlan-view] ap id 1 type-id 19 mac 60de-4476-e360
[AC_2-wlan-view] wmm-profile name wmm id 1
[AC_2-wlan-wmm-prof-wmm] quit
[AC_2-wlan-view] radio-profile name radio id 1
[AC_2-wlan-radio-prof-radio] wmm-profile name wmm
[AC_2-wlan-radio-prof-radio] quit
[AC_2-wlan-view] security-profile name security id 1
[AC_2-wlan-sec-prof-security] quit
[AC_2-wlan-view] traffic-profile name traffic id 1
[AC_2-wlan-traffic-prof-traffic] quit
[AC_2-wlan-view] service-set name huawei1 id 1
[AC_2-wlan-service-set-huawei1] ssid huawei1
[AC_2-wlan-service-set-huawei1] wlan-ess 1
[AC_2-wlan-service-set-huawei1] security-profile name security
[AC_2-wlan-service-set-huawei1] traffic-profile name traffic
[AC_2-wlan-service-set-huawei1] service-vlan 101
[AC_2-wlan-service-set-huawei1]forward-mode tunnel
[AC_2-wlan-service-set-huawei1] vlan-mobility-group 102 （必须，而且区分与AC_1）
[AC_2-wlan-service-set-huawei1] quit
漫游功能相关配置
[AC_1] master-controller enable
[AC_1] master controller
[AC_1-master-controller] ac id 1 ip 192.168.100.1
[AC_1-master-controller] ac id 2 ip 192.168.100.2
[AC_1-master-controller] mobility-group name mobility
[AC_1-mc-mg-mobility] member ac id 1
[AC_1-mc-mg-mobility] member ac id 2
说明：AC_1的配置，它作为master controller，然后在controller里面定义了漫游组，属于同一个漫游组的AC之间是可以漫游的。
[AC_2-wlan-view] master-controller ip 192.168.100.1
而AC_2的配置比较简单，只需要指定controller在哪即可，漫游组信息由master告诉其他AC成员。
下发业务给AP
[AC_1] wlan
[AC_1-wlan-view] ap 1 radio 0
[AC_1-wlan-radio-1/0] radio-profile name radio
[AC_1-wlan-radio-1/0] service-set name huawei1
[AC_1-wlan-radio-1/0] quit
[AC_1-wlan-view] commit ap 1
Warning: Committing configuration may cause service interruption,continue?[Y/N]y
[AC_2] wlan
[AC_2-wlan-view] ap 1 radio 0
[AC_2-wlan-radio-1/0] radio-profile name radio
[AC_2-wlan-radio-1/0] service-set name huawei1
[AC_2-wlan-radio-1/0] quit
[AC_2-wlan-view] commit ap 1
Warning: Committing configuration may cause service interruption,continue?[Y/N]y
测试
这里把一个客户端连接到AP_1上后，可以通过命令查看
[AC_1-wlan-view] display station assoc-info all
——————————————————————————
STA MAC AP ID RADIO ID SS ID SSID
——————————————————————————
0025-86aa-0d1c 1 0 1 huawei1
——————————————————————————
Total stations: 1
目前该客户端关联上来了，当把客户端从AP_1移动到AP_2的范围内
[AC_2-wlan-view] display station assoc-info all
——————————————————————————
STA MAC AP ID RADIO ID SS ID SSID
——————————————————————————
0025-86aa-0d1c 1 0 1 huawei1
——————————————————————————
Total stations: 1
这时候AP_2上面已经有关于客户端的信息了。
[AC_2-wlan-view] display station roam-track sta 0025-86aa-0d1c
Access SSID:huawei1 Rx/Tx:Rx-Rate/Tx-Rate Mbps
——————————————————————————
L2/L3 AC IP
AP/Radio BSSID TIME In Rx/Tx RSSI Out Rx/Tx RSSI
——————————————————————————
— 192.168.100.1
1/0 60de-4476-e360 2014/01/03 11:46:12 61/61 -51 46/13 -48
L3 192.168.100.2
1/0 dcd2-fc04-b500 2014/01/03 11:48:17 61/61 -58 -/- –
——————————————————————————
Number of roam track: 1
说明：
ENSP目前无法支持AC间漫游，所以这里无法演示。