300-115 STP Case 问题

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答案是A，解释的原因是SW1和SW2都是Server模式，但是SW1是Primary Server for VLAN Database. 在SW2上是无法新增VLAN的. 我觉得正确答案应该是B.

Question3

You are adding new VLANs: VLAN500 and VLAN600 to the topology in suchway that you need to configure SW1 as primary root for VLAN 500 and secondaryfor VLAN 600 and SW2 as primary root for VLAN 600 and secondary for VLAN 500.Which configuration step is valid?

A. Configure VLAN 500 & VLAN600 on both SW1 & SW2

B. Configure VLAN 500 and VLAN 600 on SW1 only

C. Configure VLAN 500 and VLAN 600 on SW2 only

D. Configure VLAN 500 and VLAN 600 on SW1, SW2 and SW4

E. On SW2; configure vtp mode as off and configure VLAN 500 and VLAN600; configure back to vtp server mode.

SW2#show vtp status

VTP Version capable             : 1 to 3

VTP version running             : 3

VTP Domain Name                 : CCNP

VTP Pruning Mode                : Disabled

VTP Traps Generation            : Disabled

Device ID                       : aabb.cc80.2000

Feature VLAN:

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

VTP Operating Mode                : Server

Number of existing VLANs          : 5

Number of existing extended VLANs : 0

Maximum VLANs supported locally   : 4096

Configuration Revision            : 1

Primary ID                        : aabb.cc80.1000

Primary Description               : SW1

MD5 digest                        : 0x99 0x0F 0x78 0x48 0xDF 0x4A 0xDD 0xBE

                                    0x2C 0xA9 0x09 0xF8 0xE6 0xFE 0x01 0xEE

Feature MST:

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

VTP Operating Mode                : Transparent

         

Feature UNKNOWN:

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

VTP Operating Mode                : Transparent

SW2#conf

Configuring from terminal, memory, or network [terminal]?

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

SW2(config)#vlan 500,600

VTP VLAN configuration not allowed when device is not the primary server for vlan database.

SW2(config)#

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