两台汇聚层的框式交换机通过VRRP和STP实现网关备份。为了简化配置，要将两台框式交换机合并为逻辑上的一个集群系统。
如图1-1所示，汇聚层的S1和S2是两台单框设备，现将S1和S2合并为集群系统，从而简化配置，方便维护和管理。
图1-1 单框设备合并为集群系统组网图
两台单框设备合并为集群系统时，主要配置变更点有：
- 汇聚层部署的VRRP网关备份协议不再需要，配置删除。
- 接入层部署的STP破环协议不再需要，配置删除。
- 接入层、汇聚层和核心层的链路变更为Eth-Trunk，相关接口配置需要变更，包括基本的VLAN配置、QoS和ACL配置等。
在原组网中，接入层的流量通过STP和VRRP负载分担在多条链路上，如图1所示，一部分流量通过S1转发，一部分流量通过S2转发。
图1-2 原流量转发示意图
【1】通过命令shutdown汇聚层交换机S2的上行和下行端口来切换STP和VRRP状态，使S2从网络中隔离，所有流量通过S1转发，如图1-3所示。
图1-3 切换后流量转发示意图
【2】备份S2的配置文件。因为单框设备使能集群功能重启后，接口编号会从三维格式变为四维格式，接口下的配置会丢失。
【3】配置S2为集群状态。
A、业务口集群的操作步骤
①把S2下电，安装业务板，然后将S2上电启动。
②配置集群连接方式及集群优先级。
<S2> system-view [S2] set css mode lpu [S2] set css priority 200 //配置集群优先级为200，保证在两台交换机同时启动后S2仍然被选举为主交换机 [S2] display css status saved //查看保存的集群配置信息是否正确 Current Id Saved Id CSS Enable CSS Mode Priority Master Force ------------------------------------------------------------------------------ 1 1 Off LPU 200 On
③将业务口配置为集群口。假设业务口XGE1/0/1、XGE1/0/2、XGE2/0/1、XGE2/0/2为集群口。
[S2] interface css-port 1
[S2-css-port1] port interface xgigabitethernet 1/0/1 to xgigabitethernet 1/0/2 enable
[S2-css-port1] quit
[S2] interface css-port 2
[S2-css-port2] port interface xgigabitethernet 2/0/1 to xgigabitethernet 2/0/2 enable
[S2-css-port2] quit
④使能集群功能。
[S2] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is LPU. Reboot now? [Y/N]:y
⑤设备启动后，查看S2的集群状态。如下显示表示S2已切换为集群状态。
<S2> display device
Chassis 1 (Master Switch)
S7712's Device status:
Slot Sub Type Online Power Register Status Role
-------------------------------------------------------------------------------
1 - ES0D0X12SA00 Present PowerOn Registered Normal NA
2 - ES0D0X12SA00 Present PowerOn Registered Normal NA
13 - ES1D2SRUE000 Present PowerOn Registered Normal Master
14 - ES1D2SRUE000 Present PowerOn Registered Normal Slave
PWR1 - - Present PowerOn Registered Normal NA
PWR2 - - Present PowerOn Registered Normal NA
CMU1 - EH1D200CMU00 Present PowerOn Registered Normal Master
FAN1 - - Present PowerOn Registered Normal NA
FAN2 - - Present PowerOn Registered Normal NA
FAN3 - - Present PowerOn Registered Normal NA
FAN4 - - Present PowerOn Registered Normal NA
B、集群卡集群的操作步骤
①把S2下电，安装集群卡，将S2上电启动。
②配置集群优先级。
<S2> system-view [S2] set css priority 200 //配置集群优先级为200，保证在两台交换机同时启动后S2仍然被选举为主交换机 [S2] display css status saved //查看配置是否正确 Current Id Saved Id CSS Enable CSS Mode Priority Master Force ------------------------------------------------------------------------------ 1 1 Off CSS card 200 On
③使能集群功能。
[S2] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is CSS card. Reboot now? [Y/N]:y
④设备启动后，查看S2的集群状态。如下显示表示S2已切换为集群状态。
<S2> display device
Chassis 1 (Master Switch)
S7712's Device status:
Slot Sub Type Online Power Register Status Role
-------------------------------------------------------------------------------
1 - ES0D0X12SA00 Present PowerOn Registered Normal NA
9 - ES1D2S08SX1E Present PowerOn Registered Normal NA
12 - ES0D0X12SA00 Present PowerOn Registered Normal NA
13 - ES1D2SRUE000 Present PowerOn Registered Normal Master
1 ES1D2VS04000 Present PowerOn Registered Normal NA
14 - ES1D2SRUE000 Present PowerOn Registered Normal Slave
1 ES1D2VS04000 Present PowerOn Registered Normal NA
PWR1 - - Present PowerOn Registered Normal NA
PWR2 - - Present PowerOn Registered Normal NA
CMU1 - EH1D200CMU00 Present PowerOn Registered Normal Master
FAN1 - - Present PowerOn Registered Normal NA
FAN2 - - Present PowerOn Registered Normal NA
FAN3 - - Present PowerOn Registered Normal NA
FAN4 - - Present PowerOn Registered Normal NA
①将CSS-1的上行接口XGE1/4/0/1和XGE1/4/0/2绑定为Eth-Trunk，并把原接口下的配置移到Eth-Trunk接口下。
例如：原接口下的配置如下（上行连接核心层的接口）。
#
interface XGigabitEthernet4/0/1
undo portswitch
ip address 192.168.4.2 255.255.255.0
#
interface XGigabitEthernet4/0/2
port link-type trunk
port trunk allow-pass vlan 100 200
#
按照如下步骤修改配置。
<S2> system-view
[S2] sysname CSS
[CSS] interface eth-trunk 20
[CSS-Eth-Trunk20] trunkport xgigabitethernet1/4/0/1
[CSS-Eth-Trunk20] ip address 192.168.4.2 255.255.255.0
[CSS-Eth-Trunk20] quit
[CSS] interface eth-trunk 10
[CSS-Eth-Trunk10] trunkport xgigabitethernet1/4/0/2
[CSS-Eth-Trunk10] port link-type trunk
[CSS-Eth-Trunk10] port trunk allow-pass vlan 100 200
[CSS-Eth-Trunk10] quit
②修改核心层和接入层设备的配置，把物理接口绑定为Eth-Trunk。操作步骤和上面类似，这里不再赘述。
③将CSS-1的VLANIF接口的IP地址修改为VRRP备份组的虚拟IP地址（用户网关地址）。
例如：原VLANIF接口下的配置如下。
#
interface Vlanif100
ip address 10.1.10.1 255.255.255.0
vrrp vrid 1 virtual-ip 10.1.10.111
vrrp vrid 1 priority 120
#
interface Vlanif200
ip address 10.1.20.1 255.255.255.0
vrrp vrid 2 virtual-ip 10.1.20.111
#
修改VLANIF接口的IP地址后，流量全部切换到CSS-1。
[CSS] interface vlanif 100
[CSS-Vlanif100] ip address 10.1.10.111 255.255.255.0
[CSS-Vlanif100] quit
[CSS] interface vlanif 200
[CSS-Vlanif200] ip address 10.1.20.111 255.255.255.0
[CSS-Vlanif200] quit
⑤修改QoS和ACL绑定的接口，将原来绑定到物理接口的配置变更为绑定到Eth-Trunk接口。
⑥修改CSS-1设备STP的优先级，使CSS-1成为所有VLAN的根交换机。
【5】通过命令undo shutdown打开CSS-1设备上的接口，验证CSS-1与接入层和核心层的二三层连通性。
【6】CSS-1与接入层、核心层的二三层转发正常后，将S1的端口shutdown，使S1从网络中隔离。
图1-5 流量切换到集群系统示意图
【7】把S1转换为集群状态。S1加入集群系统后，会使用集群系统的配置文件。
A、业务口集群的操作步骤
①把S1下电，安装业务板，连接S1与CSS-1之间的集群线缆，将S1上电启动。
②配置集群连接方式及集群ID，集群优先级使用缺省的1。
<S1> system-view [S1] set css mode lpu [S1] set css id 2 [S1] display css status saved //查看配置是否正确 Current Id Saved Id CSS Enable CSS Mode Priority Master Force ------------------------------------------------------------------------------ 1 2 Off LPU 1 On
③将业务口配置为集群口。假设业务口XGE1/0/1、XGE1/0/2、XGE2/0/1、XGE2/0/2为集群口。
[S1] interface css-port 1
[S1-css-port1] port interface xgigabitethernet 1/0/1 to xgigabitethernet 1/0/2 enable
[S1-css-port1] quit
[S1] interface css-port 2
[S1-css-port2] port interface xgigabitethernet 2/0/1 to xgigabitethernet 2/0/2 enable
[S1-css-port2] quit
④使能集群功能，重启设备。
[S1] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is LPU. Reboot now? [Y/N]:y
⑤设备启动后，查看集群状态，S1已经加入集群系统。
<CSS> display device Chassis 1 (Master Switch) S7712's Device status: Slot Sub Type Online Power Register Status Role ------------------------------------------------------------------------------- 1 - ES0D0X12SA00 Present PowerOn Registered Normal NA 2 - ES0D0X12SA00 Present PowerOn Registered Normal NA 13 - ES1D2SRUE000 Present PowerOn Registered Normal Master 14 - ES1D2SRUE000 Present PowerOn Registered Normal Slave PWR1 - - Present PowerOn Registered Normal NA PWR2 - - Present PowerOn Registered Normal NA CMU1 - EH1D200CMU00 Present PowerOn Registered Normal Master FAN1 - - Present PowerOn Registered Normal NA FAN2 - - Present PowerOn Registered Normal NA FAN3 - - Present PowerOn Registered Normal NA FAN4 - - Present PowerOn Registered Normal NA Chassis 2 (Standby Switch) S7712's Device status: Slot Sub Type Online Power Register Status Role ------------------------------------------------------------------------------- 1 - ES0D0X12SA00 Present PowerOn Registered Normal NA 2 - ES0D0X12SA00 Present PowerOn Registered Normal NA 13 - ES1D2SRUE000 Present PowerOn Registered Normal Master 14 - ES1D2SRUE000 Present PowerOn Registered Normal Slave PWR1 - - Present PowerOn Registered Normal NA PWR2 - - Present PowerOn Registered Normal NA CMU1 - EH1D200CMU00 Present PowerOn Registered Normal Master FAN1 - - Present PowerOn Registered Normal NA FAN2 - - Present PowerOn Registered Normal NA FAN3 - - Present PowerOn Registered Normal NA FAN4 - - Present PowerOn Registered Normal NA
B、集群卡集群的操作步骤
①把S1下电，安装集群卡，连接S1与CSS-1之间的集群线缆，将S1上电启动。
②配置集群ID，集群优先级使用缺省的1。
<S1> system-view
[S1] set css id 2
③使能集群功能，重启设备。
[S1] css enable
Warning: The CSS configuration will take effect only after the system is rebooted. The next CSS mode is CSS card. Reboot now? [Y/N]:y
④设备启动后，查看集群状态，S1已经加入集群系统。
<CSS> display device Chassis 1 (Master Switch) S7712's Device status: Slot Sub Type Online Power Register Status Role ------------------------------------------------------------------------------- 1 - ES0D0X12SA00 Present PowerOn Registered Normal NA 9 - ES1D2S08SX1E Present PowerOn Registered Normal NA 12 - ES0D0X12SA00 Present PowerOn Registered Normal NA 13 - ES1D2SRUE000 Present PowerOn Registered Normal Master 1 ES1D2VS04000 Present PowerOn Registered Normal NA 14 - ES1D2SRUE000 Present PowerOn Registered Normal Slave 1 ES1D2VS04000 Present PowerOn Registered Normal NA PWR1 - - Present PowerOn Registered Normal NA PWR2 - - Present PowerOn Registered Normal NA CMU1 - EH1D200CMU00 Present PowerOn Registered Normal Master FAN1 - - Present PowerOn Registered Normal NA FAN2 - - Present PowerOn Registered Normal NA FAN3 - - Present PowerOn Registered Normal NA FAN4 - - Present PowerOn Registered Normal NA Chassis 2 (Standby Switch) S7712's Device status: Slot Sub Type Online Power Register Status Role ------------------------------------------------------------------------------- 1 - ES0D0X12SA00 Present PowerOn Registered Normal NA 9 - ES1D2S08SX1E Present PowerOn Registered Normal NA 12 - ES0D0X12SA00 Present PowerOn Registered Normal NA 13 - ES1D2SRUE000 Present PowerOn Registered Normal Master 1 ES1D2VS04000 Present PowerOn Registered Normal NA 14 - ES1D2SRUE000 Present PowerOn Registered Normal Slave 1 ES1D2VS04000 Present PowerOn Registered Normal NA PWR1 - - Present PowerOn Registered Normal NA PWR2 - - Present PowerOn Registered Normal NA CMU1 - EH1D200CMU00 Present PowerOn Registered Normal Master FAN1 - - Present PowerOn Registered Normal NA FAN2 - - Present PowerOn Registered Normal NA FAN3 - - Present PowerOn Registered Normal NA FAN4 - - Present PowerOn Registered Normal NA
图1-6 集群合并完成示意图
【9】修改集群系统的配置，将CSS-2的接口加入Eth-Trunk。
①将CSS-2的上行接口XGE2/4/0/1和XGE2/4/0/2加入Eth-Trunk。
[CSS] interface eth-trunk 20 [CSS-Eth-Trunk20] trunkport xgigabitethernet2/4/0/1 [CSS-Eth-Trunk20] quit [CSS] interface eth-trunk 10 [CSS-Eth-Trunk10] trunkport xgigabitethernet2/4/0/2 [CSS-Eth-Trunk10] quit
②修改核心层和接入层设备的配置，把物理接口加入Eth-Trunk。操作步骤和上面类似，这里不再赘述。
【10】通过命令undo shutdown放开CSS-2的接口，检查集群系统与核心层、接入层的二三层转发是否正常。此时两台设备合并为集群系统的操作就完成了，合并后的组网图如图1-7所示。
图1-7 切换后流量转发示意图
【11】删除CSS上VRRP的配置。
[CSS] interface vlanif 100 [CSS-Vlanif100] undo vrrp vrid 1 [CSS-Vlanif100] quit [CSS] interface vlanif 200 [CSS-Vlanif200] undo vrrp vrid 2 [CSS-Vlanif200] quit