LAB14 PVST每VLAN生成树.docx
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LAB14PVST每VLAN生成树
LAB.14PVST―每VLAN生成树
实验目的：
了解pvst是什么意思；
区分PVST与STP；
了解如何通过修改stp得相关参数来影响根和端口状态。
实验拓扑：
PVST配置
实验过程：
1.在两交换机上创建VLAN2，并且将两交换机的fa0/9、fa0/11、fa0/21设置为trunk。
SW1
SW1（config）#intf0/21
SW1（config-if）#switchportmodetrunk
SW2与SW3同SW1配置相同
查看端口状态
SW1#showspanning-tree
VLAN0001
Spanningtreeenabledprotocolieee
RootIDPriority4097
Address0012.7f7a.1080
Cost19
Port9（FastEthernet0/9）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority32769（priority32768sys-id-ext1）
Address000c.8590.2100
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9RootFWD19128.9P2p
Fa0/21DesgFWD19128.21P2p
VLAN0002
Spanningtreeenabledprotocolieee
RootIDPriority32770
Address000c.8590.2100
Thisbridgeistheroot
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority32770（priority32768sys-id-ext2）
Address000c.8590.2100
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9DesgFWD19128.9P2p
Fa0/21DesgFWD19128.21P2p
SW2#showspanning-tree
VLAN0001
Spanningtreeenabledprotocolieee
RootIDPriority4097
Address0012.7f7a.1080
Cost19
Port11（FastEthernet0/11）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority32769（priority32768sys-id-ext1）
Address0013.8ba5.b3c0
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/11RootFWD19128.11P2p
Fa0/21AltnBLK19128.21P2p
VLAN0002
Spanningtreeenabledprotocolieee
RootIDPriority32770
Address000c.8590.2100
Cost19
Port21（FastEthernet0/21）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority32770（priority32768sys-id-ext2）
Address0013.8ba5.b3c0
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/11AltnBLK19128.11P2p
Fa0/21RootFWD19128.21P2p
SW3#showspanning-tree
VLAN0001
Spanningtreeenabledprotocolieee
RootIDPriority4097
Address0012.7f7a.1080
Thisbridgeistheroot
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority4097（priority4096sys-id-ext1）
Address0012.7f7a.1080
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9DesgFWD19128.9P2p
Fa0/11DesgFWD19128.11P2p
VLAN0002
Spanningtreeenabledprotocolieee
RootIDPriority32770
Address000c.8590.2100
Cost19
Port9（FastEthernet0/9）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority32770（priority32768sys-id-ext2）
Address0012.7f7a.1080
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9RootFWD19128.9P2p
Fa0/11DesgFWD19128.11P2p
通过以上输出，我们可以将目前网络的拓扑总结如下：
VLAN1
Root
阻塞
VLAN2
Root
阻塞
这里，我们希望通过对生成树参数的修改，使网络达到以下状态：
VALN1
阻塞
Root
VLAN2
Root
阻塞
阻塞
阻塞
通过以上输可知，VLAN1与VLAN2的根不在同一交换机上。
首先我们把VLAN1与VLAN2桥选到SW1上，把SW1与SW2的优先级改大或者把SW1的优先级改小。
配置如下：
SW2（config）#spanning-treevlan1priority12288
SW2（config）#spanning-treevlan2priority12288
SW3同SW2配置相同
查看showspanning-tree
SW1#showspanning-tree
VLAN0001
Spanningtreeenabledprotocolieee
RootIDPriority4097
Address000c.8590.2100
Thisbridgeistheroot
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority4097（priority4096sys-id-ext1）
Address000c.8590.2100
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9DesgFWD19128.9P2p
Fa0/21DesgFWD19128.21P2p
VLAN0002
Spanningtreeenabledprotocolieee
RootIDPriority4098
Address000c.8590.2100
Thisbridgeistheroot
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority4098（priority4096sys-id-ext2）
Address000c.8590.2100
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9DesgFWD19128.9P2p
Fa0/21DesgFWD19128.21P2p
SW2#showspanning-tree
VLAN0001
Spanningtreeenabledprotocolieee
RootIDPriority4097
Address000c.8590.2100
Cost19
Port21（FastEthernet0/21）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority12289（priority12288sys-id-ext1）
Address0013.8ba5.b3c0
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/11AltnBLK19128.11P2p
Fa0/21RootFWD19128.21P2p
VLAN0002
Spanningtreeenabledprotocolieee
RootIDPriority4098
Address000c.8590.2100
Cost19
Port21（FastEthernet0/21）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority12290（priority12288sys-id-ext2）
Address0013.8ba5.b3c0
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/11AltnBLK19128.11P2p
Fa0/21RootFWD19128.21P2p
SW3#showspanning-tree
VLAN0001
Spanningtreeenabledprotocolieee
RootIDPriority4097
Address000c.8590.2100
Cost19
Port9（FastEthernet0/9）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority12289（priority12288sys-id-ext1）
Address0012.7f7a.1080
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9RootFWD19128.9P2p
Fa0/11DesgFWD19128.11P2p
VLAN0002
Spanningtreeenabledprotocolieee
RootIDPriority4098
Address000c.8590.2100
Cost19
Port9（FastEthernet0/9）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority12290（priority12288sys-id-ext2）
Address0012.7f7a.1080
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9RootFWD19128.9P2p
Fa0/11DesgFWD19128.11P2p
通过以上输可知，阻塞端口在同一台设备上，还未达到我预期效果，在SW2或者SW3上把优先级加大。
配置如下：
SW3（config）#spanning-treevlan1priority32768
查看SW2与SW3
SW2#showspanning-tree
VLAN0001
Spanningtreeenabledprotocolieee
RootIDPriority4097
Address000c.8590.2100
Cost19
Port21（FastEthernet0/21）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority12289（priority12288sys-id-ext1）
Address0013.8ba5.b3c0
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/11DesgFWD19128.11P2p
Fa0/21RootFWD19128.21P2p
VLAN0002
Spanningtreeenabledprotocolieee
RootIDPriority4098
Address000c.8590.2100
Cost19
Port21（FastEthernet0/21）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority12290（priority12288sys-id-ext2）
Address0013.8ba5.b3c0
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/11AltnBLK19128.11P2p
Fa0/21RootFWD19128.21P2p
SW3#showspanning-tree
VLAN0001
Spanningtreeenabledprotocolieee
RootIDPriority4097
Address000c.8590.2100
Cost19
Port9（FastEthernet0/9）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority32769（priority32768sys-id-ext1）
Address0012.7f7a.1080
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9RootFWD19128.9P2p
Fa0/11AltnBLK19128.11P2p
VLAN0002
Spanningtreeenabledprotocolieee
RootIDPriority4098
Address000c.8590.2100
Cost19
Port9（FastEthernet0/9）
HelloTime2secMaxAge20secForwardDelay15sec
BridgeIDPriority12290（priority12288sys-id-ext2）
Address0012.7f7a.1080
HelloTime2secMaxAge20secForwardDelay15sec
AgingTime300
InterfaceRoleStsCostPrio.NbrType
------------------------------------------------------------------------
Fa0/9RootFWD19128.9P2p
Fa0/11DesgFWD19128.11P2p
通过以输出可知已经达到预期效果。
升级会员 