每valn生成树负载均衡

2007-05-20 10:31:15

　标签：交换　　　[推送到技术圈]

每valn生成树负载均衡

实验目标：

在本实验中，使用Cisco IOS命令调整生成树默认行为进行vlan负载均衡。

实验拓扑：

场景

已经安装了两个分布层和两个接入层交换机。网络管理员希望确保接入层交换机不会成为生成树的根网桥。分布层交换机来承担这一功能。网络管理员还希望提供每vlan负载均衡。sw1 需要成为vlan10的根，sw2需要成为vlan20的根。

网络设计表如下：

网络设计表

Catalyst类型	交换机	VTP域	VTP模式
3550	SW1	CISCO	服务器
3550	SW2	CISCO	客户端
2950	SW3	CISCO	客户端
2950	SW4	CISCO	客户端

Vlan配置信息如下表：

VLAN ID	VLAN名	Vlan子网	SW1	SW2	SW3	SW4
1	本地	172.16.1.0/24	Fa0/1-10	Fa0/1-10	Fa0/1-4 Fa0/13-24	Fa0/1-4 Fa0/13-24
10	V10	172.16.10.0/24	Fa0/11-20	Fa0/11-20	Fa0/5-8	Fa0/5-8
20	V20	172.16.20.0/24	Fa0/21-24	Fa0/21-24	Fa0/9-12	Fa0/9-12
Trunk		802.1Q	802.1Q	802.1Q	802.1Q	802.1Q

步骤1

删除交换机配置和vlan.dat文件并重启设备，按照实验拓扑图连接实验的线缆。

在所有交换机上使用show spsnning-tree观察默认行为

SW1：

sw1#show spanning-tree

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 32769

Address 0009.43bf.4f00

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 0009.43bf.4f00

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Port ID Designated Port ID

Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr

---------------- -------- --------- --- --------- -------------------- --------

Fa0/1 128.1 19 FWD 0 32769 0009.43bf.4f00 128.1

Fa0/3 128.3 19 FWD 0 32769 0009.43bf.4f00 128.3

SW2：

sw2#show spanning-tree

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 32769

Address 0009.43bf.4f00

Cost 38

Port 3 (FastEthernet0/3)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 0009.43f6.b780

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Port ID Designated Port ID

Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr

---------------- -------- --------- --- --------- -------------------- --------

Fa0/1 128.1 19 BLK 19 32769 000c.857e.a880 128.3

Fa0/3 128.3 19 FWD 19 32769 0009.b7de.26c0 128.3

SW3：

sw3#show spanning-tree

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 32769

Address 0009.43bf.4f00

Cost 19

Port 1 (FastEthernet0/1)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 000c.857e.a880

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Port ID Designated Port ID

Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr

---------------- -------- --------- --- --------- -------------------- --------

Fa0/1 128.1 19 FWD 0 32769 0009.43bf.4f00 128.1

Fa0/3 128.3 19 FWD 19 32769 000c.857e.a880 128.3

SW4：

sw4#show spanning-tree

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 32769

Address 0009.43bf.4f00

Cost 19

Port 1 (FastEthernet0/1)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 0009.b7de.26c0

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Port ID Designated Port ID

Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr

---------------- -------- --------- --- --------- -------------------- --------

Fa0/1 128.1 19 FWD 0 32769 0009.43bf.4f00 128.3

Fa0/3 128.3 19 FWD 19 32769 0009.b7de.26c0 128.3

步骤2：

配置中继接口在交换机间创建一个中继链路。在SW1和SW2上设置中继。

2950交换机不需要配置封装。这些交换机默认使用802.1Q。有些IOS版本没有其它选项。控制台连接到每个接入交换机，并配置中继：

SW1：

Sw1(config)#interface range fastethernet0/1 , fastethernet0/3

Sw1(config-if-range)#switchport mode trunk

Sw1(config-if-range)#

SW2：

Sw2(config)#interface range fastethernet0/1 , fastethernet0/3

Sw2(config-if-range)#switchport mode trunk

Sw2(config-if-range)#

SW3：

Sw3(config)#interface range fastethernet0/1 , fastethernet0/3

Sw3(config-if-range)#switchport mode trunk

Sw3(config-if-range)#

SW4：

Sw4(config)#interface range fastethernet0/1 , fastethernet0/3

Sw4(config-if-range)#switchport mode trunk

Sw4(config-if-range)#

步骤3

控制台连接到SW1并配置VTP域CISCO、服务器模式和适当的VLAN及名字：

sw1(config)#vtp domain cisco

Changing VTP domain name from test to cisco

sw1(config)#vtp mode server

Device mode already VTP SERVER.

sw1(config)#exit

sw1#vlan database

sw1(vlan)#vlan 10 name v10

VLAN 10 added:

Name: v10

sw1(vlan)#vlan 20 name v20

VLAN 20 added:

Name: v20

sw1(vlan)#

使用show vtp status和show vtp counters命令检查中继配置：

sw1#show vtp status

VTP Version : 2

Configuration Revision : 1

Maximum VLANs supported locally : 64

Number of existing VLANs : 7

VTP Operating Mode : Server

VTP Domain Name : cisco

VTP Pruning Mode : Disabled

VTP V2 Mode : Enabled

VTP Traps Generation : Disabled

MD5 digest : 0x8D 0xCD 0x2E 0x30 0x24 0x17 0x91 0xDC

Configuration last modified by 0.0.0.0 at 3-1-93 01:52:53

Local updater ID is 0.0.0.0 (no valid interface found)

sw1#show vtp counters

VTP statistics:

Summary advertisements received : 8

Subset advertisements received : 2

Request advertisements received : 2

Summary advertisements transmitted : 17

Subset advertisements transmitted : 8

Request advertisements transmitted : 1

Number of config revision errors : 0

Number of config digest errors : 0

Number of V1 summary errors : 0

VTP pruning statistics:

Trunk Join Transmitted Join Received Summary advts received from

non-pruning-capable device

---------------- ---------------- ---------------- ---------------------------

Fa0/1 1 1 0

Fa0/3 1 0 0

sw1#

按照下面的代码，将SW1上的各端口分配到各自的VLAN。可以使用interface range命令同时配置几个接口：

sw1(config)#interface range fastethernet0/11 - 20

sw1(config-if-range)#switchport mode access

sw1(config-if-range)#switchport access vlan 10

sw1(config-if-range)#exit

sw1(config)#interface range fastethernet0/21 - 24

sw1(config-if-range)#switchport access vlan 20

sw1(config-if-range)#

按照下面的代码，配置SW2作为VTP客户，并将端口划分到各自的VLAN。可以使用interface range命令同时配置几个接口：

sw2#vlan database

sw2(vlan)#vtp client

Setting device to VTP CLIENT mode.

sw2(vlan)#exit

In CLIENT state, no apply attempted.

Exiting....

sw2#config t

Enter configuration commands, one per line. End with CNTL/Z.

sw2(config)#vtp domain cisco

sw2(config)#interface range fastethernet0/11 - 20

sw2(config-if-range)#switchport mode access

sw2(config-if-range)#switchport access vlan 10

sw2(config-if-range)#exit

sw2(config)#interface range fastethernet0/21 - 24

sw2(config-if-range)#switchport access vlan 20

sw2(config-if-range)#^Z

sw2#

步骤4

按照下图，配置SW3和SW4作为VTP客户。并在每个交换机上将端口划分到各自的VLAN。可以使用interface range命令同时配置几个接口：

sw3#config t

Enter configuration commands, one per line. End with CNTL/Z.

sw3(config)#vtp mode client

Device mode already VTP CLIENT.

sw3(config)#vtp domain cisco

Changing VTP domain name from ciaco to cisco

sw3(config)#interface range fastethernet0/5 - 8

sw3(config-if-range)#switchport mode access

sw3(config-if-range)#switchport access vlan 10

sw3(config-if-range)#exit

sw3(config)#interface range fastethernet0/9 - 12

sw3(config-if-range)#switchport access vlan 20

sw3(config-if-range)#^Z

sw3#

sw4#config t

Enter configuration commands, one per line. End with CNTL/Z.

sw4(config)#vtp mode client

Device mode already VTP CLIENT.

sw4(config)#vtp domain cisco

Domain name already set to cisco.

sw4(config)#interface range fastethernet 0/5 - 8

sw4(config-if-range)#switchport mode access

sw4(config-if-range)#switchport access vlan 10

sw4(config-if-range)#exit

sw4(config)#interface range fastethernet 0/9 - 12

sw4(config-if-range)#switchport access vlan 20

sw4(config-if-range)#^Z

sw4#

控制台连接到每个交换机，使用show vtp status和show vlan命令检查VTP和VLAN 配置

SW1

sw1#show vtp status

秋日惜枫

每valn生成树负载均衡