Vlan的划分；配置trunk中继链路；以太通道配置；DHCP服务配置

其他 2018-07-27 21:49:32 阅读次数: 0

1：Vlan的划分

1.1 问题

VLAN（虚拟局域网）是对连接到的第二层交换机端口的网络用户的逻辑分段，不受网络用户的物理位置限制而根据用户需求进行网络分段。一个VLAN可以在一个交换机或者跨交换机实现。VLAN可以根据网络用户的位置、作用、部门或者根据网络用户所使用的应用程序和协议来进行分组。基于交换机的虚拟局域网能够为局域网解决冲突域、广播域、带宽问题。

  • 按企业部门规划vlan

1.2 方案

在交换机上创建vlan2、vlan3，参照如下网络拓扑如图－1所示：

图－1

1.3 步骤

实现此案例需要按照如下步骤进行。

步骤一：客户端与交换机相连

1）为了使同vlan在交换机上可以通信，需要给同vlan客户端配置同网段IP地址，如图-2、图-3所示

图-2

图-3

分别配置为192.168.1.1、192.169.1.2;192.168.2.1、192.168.2.2;192.168.3.1、192.168.3.2;

2）在交换机上创建vlan2 和vlan3并将指定的接口划分到相对应的vlan下

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  1. Switch >enable
  2. Switch#configure terminal
  3. Switch(config)#vlan 2
  4. Switch(config-vlan)#exit
  5. Switch(config)#vlan 3
  6. Switch(config-vlan)#exit
  7. Switch(config)#interface fastEthernet 0/3
  8. Switch(config-if)#switchport access vlan 2
  9. Switch(config-if)#exit
  10. Switch(config)#interface fastEthernet 0/4
  11. Switch(config-if)#switchport access vlan 2
  12. Switch(config-if)#exit
  13. Switch(config)#interface fastEthernet 0/5
  14. Switch(config-if)#switchport access vlan 3
  15. Switch(config-if)#exit
  16. Switch(config)#interface fastEthernet 0/6
  17. Switch(config-if)#switchport access vlan 3

Switch >enable

Switch#configure terminal

Switch(config)#vlan 2

Switch(config-vlan)#exit

Switch(config)#vlan 3

Switch(config-vlan)#exit

Switch(config)#interface fastEthernet 0/3

Switch(config-if)#switchport access vlan 2

Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/4

Switch(config-if)#switchport access vlan 2

Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/5

Switch(config-if)#switchport access vlan 3

Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/6

Switch(config-if)#switchport access vlan 3

3）在交换机上查看vlan信息，可以看到创建的vlan以及vlan下的接口

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  1. Switch>enable
  2. Switch#show vlan
  3.  
  4. VLAN Name Status Ports
  5. ----------------------------------------------------------------------------
  6. 1defaultactive Fa0/1, Fa0/2, Fa0/7, Fa0/8
  7. Fa0/9,Fa0/10,Fa0/11,Fa0/12
  8. Fa0/13,Fa0/14,Fa0/15,Fa0/16
  9. Fa0/17,Fa0/18,Fa0/19,Fa0/20
  10. Fa0/21,Fa0/22,Fa0/23,Fa0/24
  11. 2VLAN0002 active Fa0/3, Fa0/4
  12. 3VLAN0003 active Fa0/5, Fa0/6
  13. 1002fddi-default act/unsup
  14. 1003token-ring-default act/unsup
  15. 1004fddinet-default act/unsup
  16. 1005trnet-default act/unsup
  17.  
  18. VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
  19. --------------------------------------------------------------------
  20. 1enet 100001 1500 - - - - - 0 0
  21. 2enet 100002 1500 - - - - - 0 0
  22. 3enet 100003 1500 - - - - - 0 0
  23. 1002fddi 101002 1500 - - - - - 0 0
  24. 1003tr 101003 1500 - - - - - 0 0
  25. 1004fdnet 101004 1500 - - - ieee - 0 0
  26. 1005trnet 101005 1500 - - - ibm - 0 0
  27.  
  28. Remote SPAN VLANs
  29. ------------------------------------------------------------------------------
  30. Primary Secondary Type Ports
  31. ---------------------------------------------------------------------------

Switch>enable

Switch#show vlan

 

VLAN Name Status Ports

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

1 default active Fa0/1, Fa0/2, Fa0/7, Fa0/8

Fa0/9, Fa0/10, Fa0/11, Fa0/12

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/20

Fa0/21, Fa0/22, Fa0/23, Fa0/24

2 VLAN0002 active Fa0/3, Fa0/4

3 VLAN0003 active Fa0/5, Fa0/6

1002 fddi-default act/unsup

1003 token-ring-default act/unsup

1004 fddinet-default act/unsup

1005 trnet-default act/unsup

 

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2

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

1 enet 100001 1500 - - - - - 0 0

2 enet 100002 1500 - - - - - 0 0

3 enet 100003 1500 - - - - - 0 0

1002 fddi 101002 1500 - - - - - 0 0

1003 tr 101003 1500 - - - - - 0 0

1004 fdnet 101004 1500 - - - ieee - 0 0

1005 trnet 101005 1500 - - - ibm - 0 0

 

Remote SPAN VLANs

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

Primary Secondary Type Ports

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

4）在客户端测试网络的连通性

在192.168.1.0/24的客户机上测试1.0网段的连通性

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  1. PC1>ping 192.168.1.2
  2. Pinging 192.168.1.2 with 32 bytes of data:
  3.  
  4. Reply from 192.168.1.2: bytes=32 time=11ms TTL=128
  5. Reply from 192.168.1.2: bytes=32 time=1ms TTL=128
  6. Reply from 192.168.1.2: bytes=32 time=1ms TTL=128
  7. Reply from 192.168.1.2: bytes=32 time=4ms TTL=128
  8. Ping statistics for 192.168.1.2:
  9. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  10. Approximate round trip times in milli-seconds:
  11. Minimum = 1ms, Maximum = 11ms, Average = 4ms

PC1>ping 192.168.1.2

Pinging 192.168.1.2 with 32 bytes of data:

 

Reply from 192.168.1.2: bytes=32 time=11ms TTL=128

Reply from 192.168.1.2: bytes=32 time=1ms TTL=128

Reply from 192.168.1.2: bytes=32 time=1ms TTL=128

Reply from 192.168.1.2: bytes=32 time=4ms TTL=128

Ping statistics for 192.168.1.2:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 1ms, Maximum = 11ms, Average = 4ms

5）在192.168.2.0/24的客户机上测试2.0网段的连通性

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  1. PC>ping 192.168.2.2
  2. Pinging 192.168.2.2 with 32 bytes of data:
  3. Reply from 192.168.2.2: bytes=32 time=1ms TTL=128
  4. Reply from 192.168.2.2: bytes=32 time=0ms TTL=128
  5. Reply from 192.168.2.2: bytes=32 time=0ms TTL=128
  6. Reply from 192.168.2.2: bytes=32 time=0ms TTL=128
  7.  
  8. Ping statistics for 192.168.2.2:
  9. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  10. Approximate round trip times in milli-seconds:
  11. Minimum = 0ms, Maximum = 1ms, Average = 0ms

PC>ping 192.168.2.2

Pinging 192.168.2.2 with 32 bytes of data:

Reply from 192.168.2.2: bytes=32 time=1ms TTL=128

Reply from 192.168.2.2: bytes=32 time=0ms TTL=128

Reply from 192.168.2.2: bytes=32 time=0ms TTL=128

Reply from 192.168.2.2: bytes=32 time=0ms TTL=128

 

Ping statistics for 192.168.2.2:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 1ms, Average = 0ms

6）在192.168.3.0/24的客户机上测试3.0网段的连通性

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  1. PC>ping 192.168.3.2
  2. Pinging 192.168.3.2 with 32 bytes of data:
  3. Reply from 192.168.3.2: bytes=32 time=1ms TTL=128
  4. Reply from 192.168.3.2: bytes=32 time=0ms TTL=128
  5. Reply from 192.168.3.2: bytes=32 time=0ms TTL=128
  6. Reply from 192.168.3.2: bytes=32 time=1ms TTL=128
  7.  
  8. Ping statistics for 192.168.3.2:
  9. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  10. Approximate round trip times in milli-seconds:
  11. Minimum = 0ms, Maximum = 1ms, Average = 0ms

PC>ping 192.168.3.2

Pinging 192.168.3.2 with 32 bytes of data:

Reply from 192.168.3.2: bytes=32 time=1ms TTL=128

Reply from 192.168.3.2: bytes=32 time=0ms TTL=128

Reply from 192.168.3.2: bytes=32 time=0ms TTL=128

Reply from 192.168.3.2: bytes=32 time=1ms TTL=128

 

Ping statistics for 192.168.3.2:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 1ms, Average = 0ms

2 案例2：配置trunk中继链路

2.1 问题

在两台交换机上分别创建vlan2、vlan3，参照如下网络拓扑图-4将端口加入到指定的vlan并配置IP址，实现跨交换机的同vlan主机的通信。

图-4

2.2 方案

分别在sw1和sw2上创建vlan2和vlan3并把相应的接口划分到对应的vlan并为客户端配置IP地址，IP地址具有唯一性所以同一局域网络中不能存在相同的IP，另所有的接口默认为vlan1，所以不配置trunk中继链路vlan1也是可以跨交换机通信的。

2.3 步骤

实现此案例需要按照如下步骤进行

步骤一：为客户端配置IP，分别为交换机sw1和sw2创建vlan并把相应的接口划到相对应的vlan下

1)参照图-4为客户端分别配置相对应网段的IP

2）为交换机创建vlan2、vlan3 并把相应的接口划到vlan下

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  1. Switch >enable
  2. Switch#configure terminal
  3. Switch(config)#hostname SW1
  4. SW1(config)#Switch(config-vlan)#exit
  5. SW1(config)#vlan 3
  6. SW1(config-vlan)#exit
  7. SW1(config)#interface fastEthernet 0/3
  8. SW1(config-if)#switchport access vlan 2
  9. SW1(config-if)#exit
  10. SW1(config)#interface fastEthernet 0/4
  11. SW1(config-if)#switchport access vlan 2
  12. SW1(config-if)#exit
  13. SW1(config)#interface fastEthernet 0/5
  14. SW1(config-if)#switchport access vlan 3
  15. SW1(config-if)#exit
  16. SW1(config)#interface fastEthernet 0/6
  17. SW1(config-if)#switchport access vlan 3
  18. Switch >enable
  19. Switch#configure terminal
  20. Enter configuration commands, one per line. End with CNTL/Z.
  21. Switch(config)#hostname SW2
  22. SW2(config)#Switch(config-vlan)#exit
  23. SW2(config)#vlan 3
  24. SW2(config-vlan)#exit
  25. SW2(config)#interface fastEthernet 0/3
  26. SW2(config-if)#switchport access vlan 2
  27. SW2(config-if)#exit
  28. SW2(config)#interface fastEthernet 0/4
  29. SW2(config-if)#switchport access vlan 2
  30. SW2(config-if)#exit
  31. SW2(config)#interface fastEthernet 0/5
  32. SW2(config-if)#switchport access vlan 3
  33. SW2(config-if)#exit
  34. SW2(config)#interface fastEthernet 0/6
  35. SW2(config-if)#switchport access vlan 3

Switch >enable

Switch#configure terminal

Switch(config)#hostname SW1

SW1 (config)#Switch(config-vlan)#exit

SW1 (config)#vlan 3

SW1 (config-vlan)#exit

SW1 (config)#interface fastEthernet 0/3

SW1 (config-if)#switchport access vlan 2

SW1 (config-if)#exit

SW1 (config)#interface fastEthernet 0/4

SW1 (config-if)#switchport access vlan 2

SW1 (config-if)#exit

SW1 (config)#interface fastEthernet 0/5

SW1 (config-if)#switchport access vlan 3

SW1 (config-if)#exit

SW1 (config)#interface fastEthernet 0/6

SW1 (config-if)#switchport access vlan 3

Switch >enable

Switch#configure terminal

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

Switch(config)#hostname SW2

SW2 (config)#Switch(config-vlan)#exit

SW2 (config)#vlan 3

SW2 (config-vlan)#exit

SW2 (config)#interface fastEthernet 0/3

SW2(config-if)#switchport access vlan 2

SW2 (config-if)#exit

SW2 (config)#interface fastEthernet 0/4

SW2 (config-if)#switchport access vlan 2

SW2 (config-if)#exit

SW2 (config)#interface fastEthernet 0/5

SW2 (config-if)#switchport access vlan 3

SW2 (config-if)#exit

SW2 (config)#interface fastEthernet 0/6

SW2 (config-if)#switchport access vlan 3

3）分别查看SW1和SW2交换机上的vlan信息

copytextpop-up

  1. SW1#show vlan
  2.  
  3. VLAN Name Status Ports
  4. ----------------------------------------------------------------------------
  5. 1defaultactive Fa0/1, Fa0/2, Fa0/8, Fa0/9
  6. Fa0/10,Fa0/11,Fa0/12,Fa0/13
  7. Fa0/14,Fa0/15,Fa0/16,Fa0/17
  8. Fa0/18,Fa0/19,Fa0/20,Fa0/21
  9. Fa0/22,Fa0/23,Fa0/24
  10. 2VLAN0002 active Fa0/3, Fa0/4
  11. 3VLAN0003 active Fa0/5, Fa0/6
  12. 1002fddi-default act/unsup
  13. 1003token-ring-default act/unsup
  14. 1004fddinet-default act/unsup
  15. 1005trnet-default act/unsup
  16.  
  17. VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
  18. --------------------------------------------------------------------
  19. 1enet 100001 1500 - - - - - 0 0
  20. 2enet 100002 1500 - - - - - 0 0
  21. 3enet 100003 1500 - - - - - 0 0
  22. 1002fddi 101002 1500 - - - - - 0 0
  23. 1003tr 101003 1500 - - - - - 0 0
  24. 1004fdnet 101004 1500 - - - ieee - 0 0
  25. 1005trnet 101005 1500 - - - ibm - 0 0
  26.  
  27. Remote SPAN VLANs
  28. ------------------------------------------------------------------------------
  29.  
  30.  
  31. Primary Secondary Type Ports
  32. ---------------------------------------------------------------------------
  33. SW1#
  34.  
  35. SW2#show vlan
  36.  
  37. VLAN Name Status Ports
  38. ----------------------------------------------------------------------------
  39. 1defaultactive Fa0/1, Fa0/2, Fa0/8, Fa0/9
  40. Fa0/10,Fa0/11,Fa0/12,Fa0/13
  41. Fa0/14,Fa0/15,Fa0/16,Fa0/17
  42. Fa0/18,Fa0/19,Fa0/20,Fa0/21
  43. Fa0/22,Fa0/23,Fa0/24
  44. 2VLAN0002 active Fa0/3, Fa0/4
  45. 3VLAN0003 active Fa0/5, Fa0/6
  46. 1002fddi-default act/unsup
  47. 1003token-ring-default act/unsup
  48. 1004fddinet-default act/unsup
  49. 1005trnet-default act/unsup
  50.  
  51. VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
  52. --------------------------------------------------------------------
  53. 1enet 100001 1500 - - - - - 0 0
  54. 2enet 100002 1500 - - - - - 0 0
  55. 3enet 100003 1500 - - - - - 0 0
  56. 1002fddi 101002 1500 - - - - - 0 0
  57. 1003tr 101003 1500 - - - - - 0 0
  58. 1004fdnet 101004 1500 - - - ieee - 0 0
  59. 1005trnet 101005 1500 - - - ibm - 0 0
  60.  
  61. Remote SPAN VLANs
  62. ------------------------------------------------------------------------------
  63.  
  64.  
  65. Primary Secondary Type Ports
  66. ---------------------------------------------------------------------------
  67. SW2#

SW1#show vlan

 

VLAN Name Status Ports

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

1 default active Fa0/1, Fa0/2, Fa0/8, Fa0/9

Fa0/10, Fa0/11, Fa0/12, Fa0/13

Fa0/14, Fa0/15, Fa0/16, Fa0/17

Fa0/18, Fa0/19, Fa0/20, Fa0/21

Fa0/22, Fa0/23, Fa0/24

2 VLAN0002 active Fa0/3, Fa0/4

3 VLAN0003 active Fa0/5, Fa0/6

1002 fddi-default act/unsup

1003 token-ring-default act/unsup

1004 fddinet-default act/unsup

1005 trnet-default act/unsup

 

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2

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

1 enet 100001 1500 - - - - - 0 0

2 enet 100002 1500 - - - - - 0 0

3 enet 100003 1500 - - - - - 0 0

1002 fddi 101002 1500 - - - - - 0 0

1003 tr 101003 1500 - - - - - 0 0

1004 fdnet 101004 1500 - - - ieee - 0 0

1005 trnet 101005 1500 - - - ibm - 0 0

 

Remote SPAN VLANs

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

 

 

Primary Secondary Type Ports

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

SW1#

 

SW2#show vlan

 

VLAN Name Status Ports

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

1 default active Fa0/1, Fa0/2, Fa0/8, Fa0/9

Fa0/10, Fa0/11, Fa0/12, Fa0/13

Fa0/14, Fa0/15, Fa0/16, Fa0/17

Fa0/18, Fa0/19, Fa0/20, Fa0/21

Fa0/22, Fa0/23, Fa0/24

2 VLAN0002 active Fa0/3, Fa0/4

3 VLAN0003 active Fa0/5, Fa0/6

1002 fddi-default act/unsup

1003 token-ring-default act/unsup

1004 fddinet-default act/unsup

1005 trnet-default act/unsup

 

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2

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

1 enet 100001 1500 - - - - - 0 0

2 enet 100002 1500 - - - - - 0 0

3 enet 100003 1500 - - - - - 0 0

1002 fddi 101002 1500 - - - - - 0 0

1003 tr 101003 1500 - - - - - 0 0

1004 fdnet 101004 1500 - - - ieee - 0 0

1005 trnet 101005 1500 - - - ibm - 0 0

 

Remote SPAN VLANs

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

 

 

Primary Secondary Type Ports

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

SW2#

步骤二：为交换机配置trunk中继链接路

1）分别进入两台交换机相连接的f0/7接口配置trunk中继链路

copytextpop-up

  1. SW1>enable
  2. SW1#configure terminal
  3. SW1(config)#interface fastEthernet 0/7
  4. SW1(config-if)#switchport mode trunk
  5.  
  6. SW2#enable
  7. SW2#configure terminal
  8. SW2(config)#interface fastEthernet 0/7
  9. SW2(config-if)#switchport mode trunk
  10. SW2(config-if)#

SW1>enable

SW1#configure terminal

SW1(config)#interface fastEthernet 0/7

SW1(config-if)#switchport mode trunk

 

SW2#enable

SW2#configure terminal

SW2(config)#interface fastEthernet 0/7

SW2(config-if)#switchport mode trunk

SW2(config-if)#

2）测试2.0网段和3.0网段跨交换机通信

copytextpop-up

  1. PC>ping 192.168.2.3
  2.  
  3. Pinging 192.168.2.3 with 32 bytes of data:
  4.  
  5. Reply from 192.168.2.3: bytes=32 time=1ms TTL=128
  6. Reply from 192.168.2.3: bytes=32 time=0ms TTL=128
  7. Reply from 192.168.2.3: bytes=32 time=0ms TTL=128
  8. Reply from 192.168.2.3: bytes=32 time=0ms TTL=128
  9.  
  10. Ping statistics for 192.168.2.3:
  11. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  12. Approximate round trip times in milli-seconds:
  13. Minimum = 0ms, Maximum = 1ms, Average = 0ms
  14.  
  15. PC>ping 192.168.3.3
  16.  
  17. Pinging 192.168.3.3 with 32 bytes of data:
  18.  
  19. Reply from 192.168.3.3: bytes=32 time=1ms TTL=128
  20. Reply from 192.168.3.3: bytes=32 time=0ms TTL=128
  21. Reply from 192.168.3.3: bytes=32 time=0ms TTL=128
  22. Reply from 192.168.3.3: bytes=32 time=0ms TTL=128
  23.  
  24. Ping statistics for 192.168.3.3:
  25. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  26. Approximate round trip times in milli-seconds:
  27. Minimum = 0ms, Maximum = 1ms, Average = 0ms

PC>ping 192.168.2.3

 

Pinging 192.168.2.3 with 32 bytes of data:

 

Reply from 192.168.2.3: bytes=32 time=1ms TTL=128

Reply from 192.168.2.3: bytes=32 time=0ms TTL=128

Reply from 192.168.2.3: bytes=32 time=0ms TTL=128

Reply from 192.168.2.3: bytes=32 time=0ms TTL=128

 

Ping statistics for 192.168.2.3:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 1ms, Average = 0ms

 

PC>ping 192.168.3.3

 

Pinging 192.168.3.3 with 32 bytes of data:

 

Reply from 192.168.3.3: bytes=32 time=1ms TTL=128

Reply from 192.168.3.3: bytes=32 time=0ms TTL=128

Reply from 192.168.3.3: bytes=32 time=0ms TTL=128

Reply from 192.168.3.3: bytes=32 time=0ms TTL=128

 

Ping statistics for 192.168.3.3:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 1ms, Average = 0ms

3 案例3：以太通道配置

3.1 问题

企业需要增加带宽和网络可用性，以太通道可以同时满足这两个条件，而又无需购买新设备。

3.2 方案

在某些环境下，为了在现有条件下增加带宽而不增加额外的设备，以太通道是可用技术之一。以太通道为交换机提供了端口捆绑的技术，允许两个交换机之间通过两个或多个端口并行连接，同时传输数据，以提供更高的带宽。

企业网络模拟拓扑环境如图－5所示：

图－5

3.3 步骤

实现此案例需要按照如下步骤进行。

步骤一：在交换机A上分别配置以太通道

太通道的配置模式与Trunk类似，也有开启、企望等。同样的，在生产环境下都是强制设置以太通道处于on的状态，而不是让它们自动协商。

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  1. sw1(config)# interface range fastEthernet 0/7 – 9
  2. Switch(config-if-range)#switchport mode trunk
  3. sw1(config-if-range)#channel-group 1 mode on
  4. sw1(config-if-range)#

sw1(config)# interface range fastEthernet 0/7 – 9

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

sw1(config-if-range)#channel-group 1 mode on

sw1(config-if-range)#

步骤二：在交换机B上分别配置以太通道

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  1. sw2(config)# interface range fastEthernet 0/7 – 9
  2. Switch(config-if-range)#switchport mode trunk
  3. sw2(config-if-range)#channel-group 1 mode on
  4. sw2(config-if-range)#

sw2(config)# interface range fastEthernet 0/7 – 9

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

sw2(config-if-range)#channel-group 1 mode on

sw2(config-if-range)#

步骤三：在交换机A上查看以太通通道配置

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  1. sw1# show etherchannel 1 summary
  2. Flags: D - down P - in port-channel
  3. I - stand-alone s - suspended
  4. H - Hot-standby (LACP only)
  5. R - Layer3 S - Layer2
  6. U - in use f - failed to allocate aggregator
  7. u - unsuitable for bundling
  8. w - waiting to be aggregated
  9. d - default port
  10. Numberof channel-groups in use: 1
  11. Numberof aggregators: 1
  12. Group Port-channel Protocol Ports
  13. ------+-------------+-----------+---------------------------------
  14. 1Po1(SU) - Fa0/7(P) Fa0/8(P) Fa0/9(P)

sw1# show etherchannel 1 summary

Flags:  D - down        P - in port-channel

        I - stand-alone s - suspended

        H - Hot-standby (LACP only)

        R - Layer3      S - Layer2

        U - in use      f - failed to allocate aggregator

        u - unsuitable for bundling

        w - waiting to be aggregated

        d - default port

Number of channel-groups in use: 1

Number of aggregators:           1

Group  Port-channel  Protocol    Ports

------+-------------+-----------+---------------------------------

1      Po1(SU)          -        Fa0/7(P)   Fa0/8(P)    Fa0/9(P)

根据输出最后一行小括号中的提示，可以获知以太通道是二层的（S）、正在被使用的（U），端口Fa0/7、Fa0/8和Fa09在以太通道中（P）。

步骤四：创建以太通道后，系统会增加一个名称为Port-channel 1的端口，可以通过show running-config命令查看到其信息

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  1. sw2#show running-config
  2. Building configuration...
  3. Current configuration : 1308 bytes
  4. !
  5. version 12.2
  6. no service timestamps log datetime msec
  7. no service timestamps debug datetime msec
  8. no service password-encryption
  9. !
  10. hostname tarena-sw2
  11. !
  12. !
  13. ....
  14. interfacePort-channel 1 //以太通道信息
  15. switchport mode trunk
  16. !
  17. ....

sw2#show running-config

Building configuration...

Current configuration : 1308 bytes

!

version 12.2

no service timestamps log datetime msec

no service timestamps debug datetime msec

no service password-encryption

!

hostname tarena-sw2

!

!

.. ..

interface Port-channel 1      //以太通道信息

 switchport mode trunk

!

.. ..

4 案例4：DHCP服务配置

4.1 问题

大型企业网络客户机数量较多，客记机IP地址配置如果都为静态配置存在如下问题：

  • 增加网络管理员工作量
  • 静态手动配置容易输入错误
  • 静态手动配置容易冲突

4.2 方案

在路由器上配置DHCP服务为客户端自动分配IP地址如图-6所示：

图-6

  • VLAN 1：192.168.1.0/24
  • 网关192.168.1.254
  • 首选DNS为202.106.0.20
  • 预留IP地址打印服务器：192.168.1.1
  • 预留IP地址文件服务器：192.168.1.100

4.3 步骤

实现此案例需要按照如下步骤进行。

步骤一：路由器R1配置DHCP服务

1）配置路由器接口IP

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  1. R1(config)#interface fastEthernet 0/0
  2. R1(config-if)#ip address 192.168.1.254 255.255.255.0
  3. R1(config-if)#no shutdown

R1(config)#interface fastEthernet 0/0

R1(config-if)#ip address 192.168.1.254 255.255.255.0

R1(config-if)#no shutdown

2）DHCP服务配置

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  1. R1(config)#ip dhcp pool vlan11）
  2. R1(dhcp-config)#network 192.168.1.0 255.255.255.0
  3. R1(dhcp-config)#default-router 192.168.1.254
  4. R1(dhcp-config)#dns-server 202.106.0.20
  5. R1(config)#ip dhcp excluded-address 192.168.1.1
  6. R1(config)#ip dhcp excluded-address 192.168.1.100

R1(config)#ip dhcp pool vlan11）

R1(dhcp-config)#network 192.168.1.0 255.255.255.0

R1(dhcp-config)#default-router 192.168.1.254

R1(dhcp-config)#dns-server 202.106.0.20

R1(config)#ip dhcp excluded-address 192.168.1.1

R1(config)#ip dhcp excluded-address 192.168.1.100

3）设置主机A的IP配置为自动获取如图-7所示：

图-7

 

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