IOScollection
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-relaymapip<ip-addr><dlci>broadcast這條命令中的broadcast的作用。
CiscoIOSCommandReference中對broadcast參數的解釋是：
(Optional)Forwardsbroadcaststothisaddresswhenmulticastisnot
enabled(seetheframe-relaymulticast-dlcicommandformore
informationaboutmulticasts).Thiskeywordalsosimplifiesthe
configurationofOpenShortestPathFirst(OSPF)(seethe“Usage
Guidelines”sectionformoredetail).
我的理解是，這將使frame-relay鏈路在該映射上支持broadcast，換句話說就是在該條PVC上支持broadcast。
那麼通過OSPF測試是比較好的一個選擇，OSPF通過組播地址224.0.0.5進行neighbor的發現和鄰接關係的建立，實驗結果就是上面的內容了，答案是肯定的，在效果上，這
條命令實現了broadcast的傳遞。
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
imageactuallinkswouldbelike"SW1-R5-SW3(R2)-SW2".SW1isnotpossibletogotoBB2viaSW2directly,insteadithastotraverseFRlinkbetweenR5and
R2.soweconfiureR5&R2tomakethembridges