IOScollection

http://certs4u.info/ciscoios/

Stoptracertwhileyou'reonaCiscodeviceviaaCiscoterminalserver(C2500)

Ctrl+Shift+6+6

iftelnettoaCiscodevice,justdoCtrl+Shift+6+x

1.xrouter-in-a-stick
switchmdoetrunk
switchtrunkcncapdot1q
switchtrunkallowedvlan

1.8
SW1(C3560)notchannellingwithSW3(C3550)
memeberportsonSW1arestuckin"errordisable"

SW3(C3550)notchannellingwithSW4(C3550)
C3550notcapableofauto-mid,it'srequiredtouseacrossovercable

SW3notgettingudpatesfromVTPserver
1.makeSW1therootbridgeforvlan1
2.deletevlan.datonSW3
3.reloadSW3
4.configureSW3tobevtpserver,thenfallbacktovtpclient

1.9misSW4notgettingudpatesfromVTPserver)
http://ieoc.com/forums/t/7732.aspx?PageIndex=2

1.14misbehavior(mis-channelconfigdetectedevenifconfigslookfine)
bouncetrunkinterfaceorremovetrunkbeforemodifyittoanothertrunkingprotocol

http://jingyan.baidu.com/article/ab0b5630da5fffc15afa7d2f.html

1.17
it'saend-to-endchannel,LACPnotsupportedonSW1&SW4


debuspannevents
servicetimelog
loggconsole7


1.20
howwouldportpriorityimpactpathselection?
Alltie-breakingSTPdecisionsarebasedonthefollowingsequenceoffourconditions?
1.lowestrootbridgID
2.lowestrootpathcosttorootbridge
3.lowestsenderbridgeID
4.lowestsenderportID
herepathcost(19)equals,senderbridgeID(32778)equalstoo,theonlytie-breakingissenderportID.obviously0.21<16.20<128.19,soport21wins
hints:
portid=portpriority+portnumber
portpriorityissetto128bydefault

Prio.Nbristhepriorityadvertisedtoitsneighbor

1.21
forwardtime=listeningperiod+learningperiod,soforwardtimerissetto10

1.24
notethatUplinFastfeatureappliestothedirectfailureofthelocalrootport,whileBackBonefeatureworksonindirectfailureoccursupstream

1.25
removeuplinkrelatedconfigspriortourconfigs
notewebringdowninterfacesonupstreamswitch(sw4),insteadofSW2,totriggerdebuglogging

1.26
SW1_3560#sherrdisableflap-values


ICL
1.who'sistheISPtoprovisionICL?
2.howcanwebenefitfromICLintermsofcost?
3.willDMLonL3MPLS***phaseout,replacedbyICLsteadily?

1.34
notefa0/13'scostissetto500,000,not50,000

1.37
R2_Fa0/0:192.10.1.2
SW2_VLAN2:192.10.1.8
BB2_Fa0/0:192.10.1.254

abittricky
uall
ctrl+shit+6tostoptracert

2.1FRswitching

frame-relayroutein-dlciinterfaceout-interface-typeout-interface-numberout-dlci

ConfiguretheFrameRelayswitchingontheinterfaceusingtheframe-relayroutecommand,specifyingtheincomingDLCI,theoutgoinginterface,andthe

outgoingDLCI.NotethatFrameRelayswitchingcanbeconfiguredonlyonphysicalinterfaces.

http://www.edify100.com/Techfiles/Techfiles_Show_32.html

interfaceSerial0/2/0
ipaddress155.1.0.5255.255.255.0
encapsulationframe-relay
frame-relaymapip155.1.0.1501broadcast

notethatIP(.3.254&.2.254)ofFR'ssub-interfaceareallpingable,butnotIPoflocalinterface(s0/2/0)


2.4
R3config
!
ints1/2
encafram
!
ints1/2.100multi
ipadd155.1.100.3255.255.255.0
frameint304
frameint305
!


2.6
我要理解的概念是frame-relaymapipbroadcast这条命令中的broadcast的作用。

CiscoIOSCommandReference中对broadcast参数的解释是:
(Optional)Forwardsbroadcaststothisaddresswhenmulticastisnot
enabled(seetheframe-relaymulticast-dlcicommandformore
informationaboutmulticasts).Thiskeywordalsosimplifiesthe
configurationofOpenShortestPathFirst(OSPF)(seethe“Usage
Guidelines”sectionformoredetail).

我的理解是,这将使frame-relay链路在该映射上支持broadcast,换句话说就是在该条PVC上支持broadcast。

那么通过OSPF测试是比较好的一个选择,OSPF通过组播地址224.0.0.5进行neighbor的发现和邻接关系的建立,实验结果就是上面的内容了,答案是肯定的,在效果上,这

条命令实现了broadcast的传递。


interfaceSerial1/2
ipaddress100.1.1.3255.255.255.0
encapsulationframe-relay
frammapip100.1.1.1305


2.9
onFR
shframroute

configureR3toadd2ndserialinterface(s1/3)totheFRcloud
!
ints1/3
encafram
ipadd155.1.113.3255.255.255.0
!

loadbasicFRconfigsintoR1~R5,do"shframmap"toviewdynamicmapping

beforeloadfinalFRconfigs,do"clearframe-relayinarp"

R3:
ints1/3.999multi
frainter311
frainter312

interfaceSerial0/1/0
ipaddress155.1.45.5255.255.255.0
encapsulationframe-relay
nokeepalive
nofair-queue
frame-relaymapip155.1.45.4514broadcast

isFRdead?No,farfromit!!!
https://learningnetwork.cisco.com/thread/41529


2.15
p_w_picpathactuallinkswouldbelike"SW1-R5-SW3(R2)-SW2".SW1isnotpossibletogotoBB2viaSW2directly,insteadithastotraverseFRlinkbetweenR5and

R2.soweconfiureR5&R2tomakethembridges