Frequently asked questions

Frequently asked questions

Router

What technical specification is needed when purchasing routers?

According to own actual situation, need to know the router's performance index, the standard and protocol support situation, the port density and the type information, external dimensions target, power source request and environment parameter and so on.

How do I know whether my router moves normally?

First, through the front panel power of the router indicating light check whether the router can normally power on. Second, if power on normally, so according to the different handling ability of the router, in the router's front panels system or activity should be light in several dozens seconds. This time routers is at the normal operation condition.

How I configure routers?

To the first time used router, the user must use PC or the notebook computer with COM interface, and configure the router through the configured electric cable. Before the operation, please read in detail the system foundation chapter in the router configuration manual.

How to distribute the default VLAN of each interface of switch?

Maipu switch default state: each interface is completely connected, all belong to VLAN1.

What network testing tools are on Maipu routers?

Can be used network testing tools: 

  • PingTest network connectivity and goal reach ability. 
  • TracerouteTest routing information of data packet. 
  • NetstatExamine each network interface state and the detailed statistic information. 
  • ShowExamine system statistic information and statistic state.

When doing ping testing on routers, what the different meaning the different feedback expresses?

! : Successfully receipt echo reply grouping. 
. : Not receipt echo reply grouping before overtime.
U : Receipt a mistake grouping which the host computer can not reach.
M: Receipt an unable lamination grouping
C: Receipt an experience jam grouping
I: The ping test is severed
?: Receipt unknown type grouping
&: Receipt TTL overtime grouping

Router Ethernet interface failure judgment mentality

Basic mentality of failure analysis: from the first layer to the top First analyze the physical reason, including whether the equipment works normally and the segment connection is correct. 
Examination method: test of ping packet and the work state indicating light of the Ethernet interface.
Examination method: through the known IP address in the Ethernet interface ping network, examine whether arp list have this ip address arp list item and ping package is successful.

How to solve the problem when the Ethernet interface of the router doesn't up?

  1. Connecting with different equipment needs different Ethernet interface connecting line, often use the straight link and intersection link. Users can through examining hardware installation manual select the normal connection.
  2. Whether the two equipments support the same protocol, our company router supports the following protocols: 802.3 protocol, ETHERNETII protocol and SNAP protocol.

How to solve the problem when the Ethernet interface of the router non-stop up-down?

  1. Examine Ethernet interface working status.
  2. Examine Ethernet interface connected equipment working status. Check whether both sides can work under the same way. If the automatically consultation configuration can not be successful, can change into the designated way.

Serial failure elimination mentality

  1. Analyze this port physic reason, examination method: use show interface command examine whether the physic signal is completely up, check whether the port link, interface type (V24/V35) and equipment is normal.
  2. Analyze far-port physic reason, examination method: test whether each segment is normal working.
  3. The examination method of interface parameters configuration: examine whether the configuration is normal, and use debug command of WAN protocol to confirm where the problem is.

How to solve the problem when the serial physic signal is not completely up?

Check whether the router and DCE equipment interface type is consistent. After insuring the consistent of the interface type, the link is normal, and then the show interface will examine the physic signal condition; if some signals condition is down in DCE, DSR, CTS, TXC, it means the DCE equipment has some problem. If TDR, RTS signal condition is down, it means the router have some problems, check whether the interface configuration has done the shut down operation, if not, the problem may be in the module or router slot. So first displace serial module, and then the slot to solve the problem.

Why the physic signal is completely up but the WAN protocol is not up?

  1. The router and DCE equipment interface type (V24/V35) is inconsistent or the equipment compatibility has some problem.
  2. The both sides interface protocol of WAN or the correlative protocol configuration is inconsistent.
  3. The both sides circuitry of WAN or the equipment has some problems.

How to analyze IRMP routing question?

Step one: collect detailed network routing information. Dynamic routing protocol operates between routers, if appears failure, first must locate where the failure is.
Step two: check whether the link between the router is interlinked. Dynamic routing protocol operates above the ip layer, each router's interacting routing protocol message should first ensure the interlinked of the link routing layer.
Step three: locate the failure router, and use show command to examine the information, e.g. interface list of IRMP, neighbor table, routing table.
Step four: probably analyze where the failure is through the collecting information, and then can analyze the packet interaction through debug, find out the reason.

How to analyze OSPF routing problem?

Step one: collect detailed network routing information. Dynamic routing protocol operates between routers, if appears failure, first must locate where the failure is.
Step two: check whether the link between the router is interlinked. Dynamic routing protocol operates above the ip layer, each router's interacting routing protocol message should first ensure the interlinked of the link routing layer.
Step three: locate the failure router, and use show command to examine the information, e.g. interface list of IRMP, neighbor table, routing table.
Step four: probably analyze where the failure is through the collecting information, and then can analyze the packet interaction through debug, find out the reason.

How to analyze RIP routing problem?

Step one: collect detailed network routing information. Dynamic routing protocol operates between routers, if appears failure, first must locate where the failure is.
Step two: check whether the link between the router is interlinked. Dynamic routing protocol operates above the ip layer, each router's interacting routing protocol message should first ensure the interlinked of the link routing layer.
Step three: locate the failure router, and use show command to examine the information, e.g. interface list of RIP, neighbor table, routing table.
Step four: probably analyze where the failure is through the collecting information, and then can analyze the packet interaction through debug, find out the reason.

How to analyze BGP routing problem?

Step one: BGP uses TCP as its transmission protocol (port 179), not same as the IGP routing protocol only can establish neighbor between the neighboring routers, it can establish neighbor when it can reach, therefore, first check whether the routers can reach each other.
Step two: locate the failure router, and use show command to examine the information, e.g. interface list of BGP, neighbor table, routing table.
Step three: probably analyze where the failure is through the collecting information, and then can analyze the packet interaction through debug, find out the reason.

The basic mentality of removing the failure of CE1

To diagnose the failure of channelized E1 line, must first confirm the problem is in some channel group or on the E1 line. If the problem is in a single channel group, there may be a latent interface problem. But if the problem is on E1 line or in all the channel groups, there may be a latent controller error, or can check whether the cable is a complete set. Check whether the configuration is correct. Including whether the divided frame frequency and line code match with the service provider hypothesis. And then check the configuration of channel group, especially must confirm whether the timeslot configuration is consistent with the service provider hypothesis.
Check whether the seals protocol on the logic interface is consistent and the parameters configuration is correct.
Check whether the seals protocol parameter on the logic interface is correct and the protocol operation is normal through some debug commands.

How to remove the failure of ISDN module?

Basic mentality of failure analysis: the ST interface of ISDN needs to connect an NT equipment through a directly connected RJ45 line. But ISDN U interface only needs to insert the ISDN RJ11 plug provided by telecommunication operator directly on U interface. The ISDN misarrangement please follow from the physical layer to network layer process, gradually carries on.

  1. First observe whether the ISDN physics link activates, in order to remove the failure of the cable, interface, and other out connecting equipment.
  2. Observe whether L2 of D channel of ISDN, Q921 works normally, in order to remove the failure of TEI gain and D channel consultation activates. 
  3. Observe whether L3 of D channel of ISDN, Q931 dial up correctly, in order to remove the 3 layers calls failure of ISDN switch and configuration.
  4. Observe whether L2 of B channel of ISDN, PPP consultation process is correct, in order to remove the failure of authentication type, encapsulation and password.
  5. Observe whether the DDR calling is normal and correctly initiate the dialing from Q931 of ISDN D channel, in order to remove the failure of dialing triggering and routing.

What is the analysis mentality of the Ethernet failure of switch?

  1. First judge whether the physical link is established.
  2. Check whether the link layer and IP layer configuration are correct.

Why the link lamp is not on after the Ethernet port of Switch connects the Ethernet cable?

First check whether the Ethernet cable is connected well and then confirm whether the Ethernet cable manufacturing has the problem, so the length of Ethernet cable should not surpass 100 meters( if it's the fifth kind of cable), if it's the third kind of cable, not to surpass 30 meters.

What is the normal starting up process of 30B series switch?

After the switch is power on, it will starts up Monitor from BOOTROM (hardware); at this time format memory, read CPU type and so on. And then remove the bootrom (software) in flash and application to RAM (memory) to compress, after that, then, initialize hardware module, finally starts up successfully. 
To the equipment having the ip, it can ping connecting, telnet, web network management, but can not carry on the cluster network management.
The possible reason judgement method and solution.

What's the reason judgement method and solution for the unsuccessful main control switch configuration on network management DeviceMaster of Switch, or can not renovate interface?

  1. When adding node, the input visiting group name is not consistent with the read-only and read-write group names. On switch use show snmp-server to examine visiting group name, on DeviceMaster, use the right key menu at the node to examine the attribute visiting group name, and compare whether the input group name on network management is consistent with that on the switch.
    If the group name is consistent with read-only, then only can carry on renovating to examine operation, cannot configure. If it's consistent with read-write, then can both renovate and configure.
  2. Solution: make sure that the visiting group name on the DeviceMaster is consistent with that on the switch.

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