sat12 trobule shootting
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Failure descriptionCheck port by SHOW port command, and physicalport always keeps DOWN.
Check port by show port command, and physicalport always keeps UP, but losing package seriously
while pinging opposite end
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I haven't received
yet!Data package loses
seriously while pinging
opposite end
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Question 2:Finding that the physical port isD O W N w h ile checking router serial portstate,and notice the following signal states are:
DCD=UP DTR=DOWN DSR=UP RTS=DOWNCTS=UP Why?.
Answer:We know that DTR RTS signals are bothsent from DTE(data terminal),so maybe the DTEequipments did not connect well,Checking
whether the DTE equipments connect correctlyand whether cable or line has questions.
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Question 4:What's the difference betweenconfiguration port and backup port cable ofQUIDWAY router.
Solutions:Configuration port cable DB9(25) end isDCE head, while backup port cable DB9(25) endis DTE head, In fact it also can be understoodeasily: the router is regarded as DCE while
configuring router, while which is regarded asDTE when the router connects MODEM by AUXport.
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Failure descriptionFailure description1.Checking port with show port command,physical port is UP and protocol is DOW N .
2. Checking port with show port command,physical port is UP and protocol is DOWN, butcan't ping other ends.
3. Checking port with show port command,physical port is UP and protocol is UP. But losingpackage seriously while data is excessive, and thisproblem often happens in the Ethernet port.
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Whether the protocol is right
PPP X25 FR
Whether the working method is right
DCE DTE X25 FR
Whether the frame format of link layer is right
X25 FR Ethernet
Whether the address mapping of link layer is right?Whether IP address is right?
DDR X25 FR
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Hello! Our
equipment may
have questions?
QUIDWAY 2501 router and CISCO routerperform PPP interconnection failure?
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Two routers in terconnec t by DDN, and two endsencapsulate PPP protocol separate ly . Afterc he c king the por t s ta te w ith SHOW c o mm a nd,you'' l l f ind the physical layer and protocal layerare both UP, but pinging opposite end fai lure ,
w h y ?1Refresh port state with SHUT DOWNNO SHUT DOWN command,
then pinging opposite end;
2Observe debugging information with DEBUG PPP PACKET front, to
find both sides are in REQUEST state while routers of two sides
perform LCP negotiation.There maybe problems in middle link, at this
time you should check the state of middle transmission line.
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Question1 :Two connecting sides encapsulate X.25(or encapsulate LAPB directly),but
protocol is always in disconnection state.Open debugging front DEBUG X25 PACKET
and to find that one end sends SABM frame,while the other sends FRMR frame.This
repeats continuously.
Solut ions:This pheonomenon is becauseboth s ide are encapsulated in the samewo r k ing mo de (DTE o r DCE) , a nd c ha ng ingworking mode of one end wi l l make i t .
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Question 2: X25 can build virtual circuit, but
which will reset or clear continually during data
transmission.
Solution: This result may be caused by incorrectparameter setting of flow controling. If it is direct
connection of back to back, please check local
sending window receiving window is matching or
not; If it accesses to public grouping network, it is
necessary to consult right flow control parameterfrom network management section.
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Question 3:W hen configuring x.25 addressmapping, the system prompts that the addressoverlap.
Analysis:In the X.25 address mapping,one IPaddress can only be corresponded to one x121address. When an IP address is configured to twodiffent x121 address,conflicts will occur.
Solution:Use the command no x25 map ip to delete
olde address mappings and configure the addressmappings again.
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Question 1: Frame relay of Quidway2501 and Cisccan not connect.
Anlaysis: The encapsulation format ofQuidway2501 frame relay defaults IEIF, while
Cisco defaults Cisco; LMI of Quidway2501 defaultQ.933A, while Cisco defaults Cisco.
Solution: Change settings of two sides into identicalvalues, i.e. port setting of Quidway:
encapsulation fr ciscofr lmi-type cisco
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Failure description:Ping host computer of other netwo
unsuccessfully
Malfunction locating
1. IP address setting problem
2. routing problem
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Question: When configure firewall,configuring the followingcommand:Access-list normal 102 permit udp any202.38.160.1 0.0.0.0 neq rip, to find
interface with IP being 202.38.160.1(maskis three 255) still can receive RIP package.
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Failure description:Dial port configured by router can't dial
Malfunction locating
1.Modem can't work properly2.Configuration of dial port has error
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Not conf igure USER-NAME, which resu l t s in PPP
negotiat ion pass ing fa i lure;
N o t c o n f i g u r e P P P A U T H E N T I C A T I O N w h i c h r e sthat PPP don' t a sk for NAME from oppos i te end to
DDR appl ica t ion;
C o n f i g u r e d P P P A U T H E N T I C A T I O N P A P , b u t
c o n f i g u r a t i o n o f P P P P A P S E N T - U S E R N A M E h a s
error ,which results in PPP negotiat ion pass ing fa i lu
C o n f i g u r e d P P P A U T H E N T I C A T I O N C H A P , b u tc o nf ig ur a t io n o f PPP CHAP HOST ha s e r r o r , wh ic
in PPP negotiat ion pass ing fa i lure .
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Failure description
1.Check port by show port command, and Ethernealways keeps DOWN.
2.Check port by show port command, and Ethernealways keeps UP, but can't ping host addresssuccessfully.
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Question:After dial user of 2509 dial router from asynchronous port(asy
port),you can ping asynchronous port and Ethernet port of 2509 at
terminal,but can't ping server on Ethernet connecting to 2509seccessfully.
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Analysis and solution for physical layer problem
Analysis and solution for link layer problem
Analysis and solution for network layer problem
Analysis and solution for DDR problem
Analysis and solution for Ethernet problem
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