07生成树实验讲解Word下载.docx
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07生成树实验讲解Word下载.docx
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^uitchA<
conf±
$f>
Uulan10
<
con£
±
Qf-vlan^ttnamesalesswitchA<
config-vlanJttexitsrwitcliA<
conf±
9>
liint910/3switcliA<
config-if^Gig(ahitEthei'
net0/3>
ttsi?
itcliportaccessulan10switchA<
config-if-GigahitEthernet0/3>
ttexit
switchA<
config->
ltintrangreg(i0/l-2
config-if-ran^ecliportnodetpixnk
config-if-range>
#
步骤2:
配置交换机B:
22-S5750-2>
22S5750-2>
enable14
Passuord:
22-S5750-2ilconfi»
Entei*confioncommands«
oneperline_EnduithCNTL/Z.
22-S5750-2<
confis(>
#}»
ostnaneSuitchB
SuitchB<
config>
ttvlan10
SuitcliB<
config-ulan>
ttnamesales
SuitchB<
conf-ulan
SwitchB<
configrMtintgi0/3
config-if-GigabitEthEi'
n^t0/3>
#switcliportaccessmlan10SwitchB<
config-if-GigabitEthernetfi/3>
#exit
confrangfesfiO/l—2
Sk?
itcliB<
configf-if-I'
an^e>
ttswitchportmodetrunk
步骤3:
配置两交换机的快速生成树协议:
|SuitchB<
config-if-r^nge>
ISwitchB^confi^>
ttspannin^-tree
Enablespannin^tree-
SwltchEteonf1H11:
53:
49:
kSPnNTHEE-6-RCUDTCBPDU:
RectiuedtcbpduonpoIrtGigabitEthernetOzlonMST0.
et0/1onMSIM.9:
xSPANTREE-6-ECUPTCBFDU:
ReceivedtcbpduonportGigabitEthern|'
*fipr1811:
53:
5Q:
z£
PANTREE-5-TOPOTRAP:
Topalogi/ChangeTrapforinstance0.
et0/1onMSTO.l:
2SPANTREE-6-ECUDTCBPDU:
ReceiuedtcbpduanportGigahitEthern
SwicchB<
config)ttspanning-treenod#rstp
SwltchBCconfIB11:
54:
11:
>
*SPnNTREE-5-TOFOTRfiPiTapologyChangeTrap,
i—事■
SUitclkACconfi$f>
#spanning-tree
En^hlespftnningr-tree,
ShitehA(config>
tfsp^nnin^^tveemoderstp
xSPANTREE-5-ROOTCHANGE:
RootChanged:
NeuRootPortiwGigabitRcqtMacAddressis5869.6cl5*5730.
zSPANTREE-6-RCUDTCBPDU:
Receiuedtchpduanpci*tGigabitEthemzSPANTREE-6-RCUDTCBPDU:
RaceivedtcbpduonportGigabitEthern
U/lportFaststatecliangedfromedgetonon-edsfe.TFASTCHG:
PortGigabitEthe】*net*fipr1811:
58:
36:
Ethernet0/1.Neu
let0/1onMST0.8:
Lt0"
onMST0.9:
再按照拓扑图连接实验设备,此时包增长情况如下:
re
t:
\User8\B402>
pin({192.168.1,20-t
此时两PC间可以相互ping通,且无广播风暴。
由此可见生成树协议的作用为避免网络中存在交换环路的时候产生广播风暴,确保在网络中有环路时自动切断环路。
步骤4:
验证测试
SwitchA的生成树信息:
幻Telnet172,16.22.5
suitchAttshouspannin^一七ree
StpUersion:
RSTP
Sv^StpStatus:
ENABLED
MaxA^e:
20
Hello!
ine:
2
For-WArdDelav:
15
BridgeMaxA^e:
Bpid^eHello!
BridsrcForwardDelav•15
MaxHops:
TxHoIdCount:
3
PathCostMethod:
Lan甘
BPDUGuard:
Disabled
BPDUFilter:
Disaljled
LoopGuardDef:
Bridgeftddr:
5S69.6cl5.5736
Prioritp:
32768
TimeSincelDpolosryChange:
0d:
0h:
4m:
55s
IopologvChanges:
1
DesignatedBoot:
32768.5869.6cl5.5730
・RootCost:
20000
RootPort:
GigrabitEthernet0/1switchAtl
SwitchB的生成树信息:
SMltchBttshouspanning-tree
Styllei*sion:
RSTPSjjsStpStatus:
ENABLEDMaxAge:
HelloTime:
ForwardDelay:
15BpldgeMaxA^e:
20BridgeHelloTine:
2BridgeForwardDelay:
15MaxHops:
TxHoldCount:
PathCastMetliod:
LongBPDUGuard:
DisabledBPDUFilter:
DisabledLoopGuardDef:
DisabledBrld^eAddp:
S869-5730Priority:
TimeSinceTopolo^Chan^e:
0h:
3mTopo:
DesignatedRoot:
32768・Ecl.5・5?
30
RootCast:
0
RootFart:
0SwitchEtt
SwitchB中RootCost和RootPort值都为0,因此SwitchB为根交换机。
根端口为G0/1。
计算机网络实验报告
步骤5:
设置交换机的优先级
将SwitchA的优先级设置为4096
switchA4t
IswitchAtt
swltchAttspanning^tFeepr^iorlt<
j4096kUnltnovnconnand■
sviitchAttcanfijf
Enterconfi<
/uracionconmandsoneperline.EndwithCNTL/Z.
sultchA(conf5/4096
zSPfiNTBEE-6-RX」HH8PD(J:
ReceiuedinferiorDFDUonportGigabitzSPfiNTPEE-5—TOPOTPAP:
Topolog;
/ChangeTrap.
MSPANTKEE-5-TOPOTKAP:
Topolog*ChangeTrap.
dastheRootBridge-1812=05=42:
:
SPAMTREE-5-EUENT=ThedeuicehasbeenselecteEthBHiet0/1.:
42:
k*App1812:
05:
42=*ftpr1812:
44:
switchA(config
let0L/1onMST0.
步骤6:
验证SwitchA的优先级
switcliAttsliovspannins|—treeStpUersion:
HSTP
Sj/sStpStatu&
:
ENABLED
MaxAge:
20HelloTime:
2Foi*wardBelay=15BridgeMaxAge:
20Brid^eHelloTime:
2BridgeForuardDelav:
3PathCostMethod=LangBPDUGua^d:
DisabledBrid^eAddr:
S869.6cl5.5736Priority:
4M96
TineSinceTopologvCli^nge:
Ad:
01i:
ln:
llsTopolo^^Clian^es:
Desi^natedRoot:
4096_5869.6cl5_5736FlootCost:
0s^ltchAit
当两个端口都连在一个共享介质上,交换机会选择一个高优先级的端口进入forwarding状态,低优先级的端口进入discarding状态。
4896.5869.6cl5.5736
PortAdminPortFast:
DisabledPortOperPortFast:
DisabledPortAdninAntaEd^e:
EnahledPortOpeeAutoEdge:
DisabledPortAdmInLinJcType:
autoPortOperLink!
i/pe:
point-to-pointPortBPDUGuard:
DisabledPortBPDUFilter:
DisabledPortGuardmode:
NonePortState:
forwardingPortPriority:
12SPortDesignatedKoot:
PortDesIgnatedCo^t:
PortDesicfnatedBi*id^e.5969_6ci5_5736
PortBesign^tedPoi'
tPrio^itp:
12RPortDesijpiatedP'
ort:
PortForwarrdTi*ansitions:
2PortAd(ninP^athCost:
201000PortOperPatliCost:
20000Inconsistentstates:
nornalPortRole:
rootPort
品中山丸辱、丄店
步骤7:
验证交换机SwitchB的G0/1,G0/2,端口的状态
S^itchBtt
SwitchBitshow^panning-treeintgi0/l
et0/1onMST0.
SuiteliBttshouspannin^-tr*eeStpVersion:
RSTP{SysStpStatus:
ENABLEDflaxAge:
HelloTine:
ForwardDelay:
15BridgeMaxAge:
28
Bridsf^Hellolime:
Bridg'
eFoi'
wai'
dDeLay:
15MaxHaps=20
3^PathCostMethod:
Lon日BPDIIGuard:
DisablediBFDUFilter:
DisabledLoopGuai*dDef:
DisablediridgeAddr:
5869
Priority:
TImeSinceTopologvCh^n^e:
0h:
6sTopolosryChang总希:
3
Desi^natedRodt:
4096_58&
9_6cl5.E736RaotCost:
HootPort:
GigabitEthernet0/1SuitchBtt
SwitchBtt
SvfitchBttshouspanning-treeintqi0/2
PortOperPortFast:
PortAdminAutoEd^e:
Enabled
PortOperAutoEdge:
PoptAdminLinl^Tvpe:
auto
PortOperLin]cTs/peipoint-to-point
PortBPDUGuapd-Disabled
PoptBPDUFilter:
PortGuardmodeiNone
PovtState:
discarding
PortPriority:
128
PortDesignatedRoot=4096_5869_6c15.5736
PortDesignatedCost:
PortDesignatedBridfife:
4096・5969.6cl5.573S
PortDesignatedPortPriority:
Poi*tDesignatedPort=2
PortForwardTransitions:
FortAdminFatliCost:
200陌0
PoptOperPathCost:
2000A
InconsistEntstates:
nonnal
PortRole:
alternatePort
SuitchBtt
由上图可知,SwitchB的GO/1端口处于转发状态,G0/2端口处于组阻塞状态
步骤8:
步骤7后每个交换机的信息如下:
两交换机G0/1端口链路down之后SwitchB的端口2信息如下:
S^itchBltshouspanning-treeintgi0/2
PortBesignatucWFiUge:
40?
6.5869>
6cl5・5736
PortDssisfnatedPortPriority:
12S
PortDesignatedPort:
PortFopw^pdTransitions:
PortAdminFathCos七:
20000
LPortOperFathCost:
2006tl
Inconsistentstates:
normal
rootPortSuitchBtt
此时每个交换机的信息:
IsvitcliAtts:
hou1spanning-tree
IstpUersion:
RSTPklsv^StpStatus:
VlaxAgs:
20IPHelloTime:
2ilForwardDelay:
BridgeMaxAge:
20BridgeHelloTine:
PathCostMetliod:
DisahledBPDUFiltep:
DisabledLoopGuai^dDef:
DisabledBridgeAddt:
5869Priority:
4096
TineSinceTopolosrj/Change:
0d:
0h=7n)=36sTopologes:
Desi^rnatedJloot:
4096_5869-6cl5_5736RootCost:
0switcliAlt
SuitchBttsliowspanning-treeStpUersion:
BSTPSysStpStatus:
ENABLEDHaxAc/e:
HelloTine:
2ForwardDelay:
15firidQfeHaxAcf&
20EridgeHelloTime:
2BpidgfeForwardDelay:
TxHaldCount:
FatFCostMethod:
Lon^BPDUGuard:
DisabledBridgeAddr:
5869・Eci吕.5730Pi*±
op±
ty:
1imeEinccIopo丄:
Wd:
Wh:
lm:
17sTopologvChanges:
4
4096-S869AootCost:
200H0
BootPort:
GiyabitEthernet0/2SwitchBtt
down
与之前相比,SwitchB的RootPort变为G0/2,其他均未变化。
说明一条链路之后,生成树协议启用了备用端口使得整个链路恢复数据传输。
SwitchA和SwitchB之间的一条链路down掉时,PC1和PC2仍然能相互ping通,但会丢包:
C:
xUsers\B402>
ping192.168.1.28-t
说明生成树在链路断掉后重新构筑,原先阻塞的链路已经变为转发状态,一个端口断开时会将流量切换到另一个端口上,中间有短暂的联路中段,丢包数为一个
此时每个交换机的生成树信息如下:
suitchAttshowspanning-t^eeStpUersion:
RSTPS^sStpStatus:
ENABLEDMaxAye:
HellaTine:
Forwai*dDe:
BridgeMaxfige:
20BridgeHelloTime:
BridgeFoi'
wardDelay:
Lon^fBPDUGuard:
BridgeAddr:
586?
.6cl5.5736Priority:
TImeSlnceTopolog-^Chang-e:
6d.:
6h:
lm:
4sTopologt/CVianges:
DesigrnatedRoot:
4096.5869.5738
RootCost:
0sultchAtt
StjitchBttsIidvj15panning-tr-eeStpUersion:
RSTPSv^StpStatus:
M^ixA^e:
HelloTime:
ForwardDelav:
BridgeMaxAg(e:
2Bi'
id$(eForuai'
dDelav:
TxHoldCo«
nt:
3PatliCostMetFod:
DisaJb丄Ed
Brid^eAddr:
5869_6cl5-5730Priority-32768
TimeSinceTopolog^Chan^e:
Oh:
0rn:
46sTopologpChan^es:
6
4096«
586?
.6c15.5736AootCost:
RootPor
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