Manuale d’uso / di manutenzione del prodotto 10014302 del fabbricante 3Com
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3Com R outer Command R eference Guide Addendum for V1.20 http://www.3com.com/ Part No. 100143 02 Published Janu ary 2004.
1.1. Intr oduction 1.1.1. Scope This manual provides command ref erence information f or new software features foun d in V1.20 of the 3Com Router op erating system. Use this addend um to supplem ent command reference information found i n the 3Com Rout er Comm and Reference Gui de .
Chapter 1 CBQ Configuration Commands 1.1 af Syn tax af bandwid th { bandwidth | pct percent age } undo af View Policy-class v iew Parameter bandwid th : Bandwidt h in kbit/s in the range of 8 to 1000000. percentag e : Percentage o f available bandwid th in the range of 1 to 100.
1.2 car Syn tax car cir rate [ cbs size ebs size ] [ conform action [ exceed action ] ] undo car View Policy-class v iew Parameter cir rate : Committed information rate in the ra nge of 8 000 to 155000000 bit/s. cbs size : Committed burst size, that is, the number of bit s that can be sent in each interval in the range of 15000 to 155000 000 bit s.
For the related command, see qos policy , qos-clas s . Example Configure traf fic monitoring for a class. The normal traf fic of packet s is 38400bit/s. Burst traffic twice of the normal traf fic can pass initially and later the traffic is transmitted normally when the rate does not exceed 38 400bit/s.
Description Using the debugging qos command, you can enable the debu gging of QoS. Using the undo debugging qos command, you ca n disable the debugging of Qos. By default, the debugging of QoS is disabled. Example Enable the debugging of the CBQ class in formation on the interfa c e Serial0.
1.5 display qos class Syn tax display qos class [ class-name ] View All views Parameter class- name : Name of the class. By default, the information of all classes are displayed. Description Using the display qos class command, you can browse the class info rmation concerning router configu ra tion.
Parameter policy-name : Name of policy . By default, the configuration information of all policies are displayed. class- name : Class name in the policy . Description Using the display qos policy command, you can b rowse the configuration information of the specified or all classe s of the specifi ed or all policies.
Committed Access Rate: CIR 8000 (Bps), CBS15000 (Bit), EBS 0 (Bit) Conform Action: remark mpls exp 3 and pass Exceed Action: discard Class: SH APE Behavior(s): Traffic Shape: CIR 8000 (Bps), CBS 15000 (Bit), EBS 0 (Bit) Queue Length 1024 (Packet) 1.
Behavior(s): Default Queue: Flow Based Fair Queueing Max number of hashed queues 256 Matched: 0/0 (Packets/Bytes) Enqueued: 0/0 (Packets/Bytes) Discarded: 0/0 (Packets/Bytes) Discard Method: Tail Clas.
General Traffic Shaping: CIR 8000 (Bps), CBS 15000 (Bit), EBS 0 (Bit) Queue Length: 1024 (Packets) Queue Size: 0 (Packets) Pass : 0/0 (Pa ckets/Bytes) Discard : 0/0 (Packets/Bytes) Delay : 0/0 (Packet.
View Policy-class v iew Parameter bandwid th : Bandwidt h in kbit/s in the range of 8 to 1000000. size : S pecify the allowed burst size in byte in the range of 32 to 2000000.
Parameter cir rate : Committed information rate. cbs size : Burst size in the range of 15000 to 155000000 bits. By default, it is equal to half of cir rate . ebs size : Excessive burst size in the range of 0 to 155 0000 00 bits. By default, it is 0. queue-length length : Queue length in t he range of 1 to 1024.
View Class view Parameter access-list-number : ACL number . logic-not : Do not match the class. Description Using the if-match acl command, you can d efine an ACL match rule. Using the undo if-match acl command, you can delete an ACL match rule. For the related command, see qos clas s .
Example Define match rule for all packet s . [3Com] qos class class1 [3Com-qosclass-class1] if-match any 1.12 if-match class Syn tax if-match [ logic-not ] class class-name undo if-match [ logic-not ] class class-name View Class view Parameter class- name : Class name.
Example Define class2 by invoking class1. Define match rule for class2. As class1 w ill be invoked, you shou ld configure cl ass1 first.The match rule for class1 is: IP precedence is 5.
1.14 if-match inbound-interface Syn tax if-match [ logic-not ] inbound-inter fa ce { type number } undo if-match [ logic-not ] inbound-interface { type number } View Class view Parameter interface - type : Interface type.
Parameter ip-dscp value : DSCP value in the range of 0 to 63. Description Using the if-match dscp command, you can defin e DSCP match rule. Usin g the undo if-match dscp command, you can delete DS CP match rule. Y ou can configure this command for a cla ss for several times.
Description Using the if-match ip-pr ecedence command, you can define IP precedence match rule. Using the undo if-match ip-precedence command, you can delete IP precedence match rule. When the command is configured, the ip-precedence-valu e will be sorted automatically in ascending order .
The match rule for source MAC address is ef fective only for input p olicies and Ethernet interfaces. For the related command, see qos clas s . Example Define the match rule of class1 as follows: match the p ackets with the destination MAC address as 0050-ba27-b ed3.
1.19 if-match rtp Syn tax if-match [ logic-not ] rtp st art-port starting-po rt-number end-po rt end-por t-number undo if-match [ logic-not ] rtp st art-port st arting-port-num ber end-port end-port-number View Class view Parameter starting-port-num ber : S tarting R TP port number in the range of 200 0 to 65535.
View Interface view Parameter token- number : The number of sending toke ns, in the range from 1 to 50. Description Using the qmtoke n command, you can configure the number of Q oS sending tokens. Using the undo qmtok en command, you can di sable the sendin g token function of QoS.
View Interface view Parameter inbound : Inbound direction. outbound : Outbound direction. policy-name : Policy name. Description Using the qos apply policy command, you can att ach an associated QoS policy to an interface. Using the undo qos a pply policy command, you can delete associated QoS policy from an interface.
View System view . Parameter logic-and : S pecify the relation between the rules in the class as logic AND. That is, the packet that matches al l t he rules belongs to this cl ass. logic-or : S pecify the relation between the rules in the cla ss as logic OR.
Description Using qos max-bandwid t h command, you can set the maximum band width of an interface. Using undo qos max-band wid th command, you can remove the setting of the maximum bandwidt h. By default, the maximum bandwidth i s not configured for all interfaces.
Description Using qos policy command, you can define a poli cy and enter map vi e w . U s ing undo qos policy command, you can delete a policy . The policy cannot be deleted if it is applied on an interface. It is nece ssary to remove application of the policy on the current interface b efore deleting it via the undo qos policy command.
Example Set the percentage of the maximum re served bandwid th allocated to the R TP queue application to 70% of the available bandwid th. [3Com-Serial0] qos reserved-bandwidth pct 70 1.26 qos-class Syn tax qos-class class-name undo qos-class class-name View Class view Parameter class- name : Name of class.
View Policy-class v iew Parameter queue-length : Maximum threshol d value of the queue in the range of 1 to 1024. The default drop mode is tail d rop. Description Using queue-length command, you can configure maximum queue length. Usin g undo queue-length command, you can delete configuratio n.
Parameter value : DSCP value in the range of 0 to 63, whi ch can be any of the followi ng keys: ef , af1 1 , af12 , af13 , af21 , af22 , af23 , af31 , af32 , af33 , af41 , af42 , af43 , cs1 , cs2 , cs3 , cs4 , cs5 or cs7 . Description Using remark ip - dscp command, you can configure t he DSCP value for a cla ss to identify the matched p ackets.
Example Configure precedence value to 6 to identify p a ckets. [3Com] qos policy 3Com [3Com-qospolicy-3Com] qos-class database [3Com-qospolicy-c-3Com database] remark ip-precedence 6 1.
undo w red [ ip-dscp | ip-precedence ] View Policy-class v iew Parameter ip - dscp : Indicate that DSCP value is used when calculating dro p proportion for a pack et. ip-precedence : Indicate that IP prece dence value is used when cal culating drop proportion for a packet.
View Policy-class v iew Parameter value : DSCP value in the range of 0 to 63, which ca n be any of the following keys: ef , af1 1 , af12 , af13 , af21 , af22 , af23 , af31 , af32 , af33 , af41 , af42 , af43 , cs1 , cs2 , cs3 , cs4 , cs5 or cs7 . low-limit : Lower threshold value in the range of 1 to 10 24.
1.33 wred ip-precedence Syn tax wred ip-precedence value low-limit low-limit high-limit high-limit [ discard-probability discard-prob ] undo wred ip-precedence valu e View Policy-class v iew Parameter value : Precedence of IP packet s in the range of 0 to 7.
1.34 wred weighting-constant Syn tax wred weighting-const ant exponent undo w red weighting-const ant View Policy-class v iew Parameter exponent : Exponential in the ra nge of 1 to 16. It is 6 by default. Description Using wred w eighting-const ant command, you can set exponential for the calculation of average queue length by WRE D.
Chapter 2 TACACS+ Configuration Commands 2.1 debugging hwtacacs Syn tax debugging hwt acacs { authentication | authoriza tion | accounting } [ packet ] [ user user-nam e ][ interface inter face-name ].
Using debugging hwt acacs authentication command, you can display the authentication information and th e authorizatio n st ate of the current users. If the command is not configured with any argume nt, the information of all the users will be displayed.
Example # Display the accounting information of AAA users. [3Com] display hwtacacs accounting Hwtacacs Accounting Statistics Accounting Packet Wait-Queue Length: 0 Username don Accounting time=00:01:1.
Table 2-1 Field description of the display hwtacacs accounting command Item Description interface Interface used by a user, which can be any type of i nterfaces listed as follows: Physical interfac es.
AUTHENTICA TION TERMINA TE packets sent by the router , the received and transmitted packet s, and the number of connection failures. Using the display h wtacacs serv e r verbose command, you can disp.
View Hwtacacs vie w Parameter None Description Using domain command, you can configure a spec ifi ed T ACACS+ server to permit a user to directly specify the domain na me when entering the user name.
Parameter ip ip-address : IP address o f the T ACACS+ server to be added. name host-name : Name of the T ACACS+ server to be added, which h as been configured by the IP host comman d. It is a string of 1 to 20 print able characters except for the space.
Each T ACACS+ server group allo ws only one primary authe ntication server , one primary authorization serv er , and one primary accounting server . When you configure a second primary server , there .
2.6 hwtacacs-server template Syn tax hwtacacs-server template template-name undo hwta ca cs-server template template-name View System view Parameter template-name : The string naming a server g roup, which cont ains 1 to 20 printable characters except for the sp ace.
2.7 reset hwtacacs accounting statistics Syn tax reset hwt acacs accounting st atistics View All views Parameter None Description Using reset h w tac acs accounting st atistics command, you can clear all acco unting statist i cs for AAA users. For a related command, see display h wtaca cs ac counting .
Example # Clear all the st atisti cs of T ACACS+ servers. [Router] reset hwtacacs server statistics 2.9 shared-key Syn tax shared-key key- str in g undo shared-key View Hwtacacs vie w Parameter key-strin g : The encrypted key used for t he AAA negotiation between the router and a T ACACS+ server .
2.10 source-ip Syn tax source-ip { ip-address | interface interface -type inte rface-n umber } undo source-ip View Hwtacacs vie w Parameter ip-address : T he source IP address of all the T ACACS+ pa ckets. interface-type : Interface type, such as serial.
2.11 timer quiet Syn tax timer quiet minute s undo timer quiet View Hwtacacs vie w Parameter minutes : Switchover interval, which must be in the range of 1 to 255 minutes and defaults to 5 minutes.
Chapter 3 SSH Configuration Commands 3.1 debugging rsa Syn tax debugging rsa undo debugging rsa View All views Parameter None Description Using the debugging rsa comma nd, you can enable RSA debugging and send the details of all the processes and the p acket structu re of the RSA algorithm to the info-center in the form of debu gging information.
View User view Parameter VTY index : The SSH ch annel being de bugged. Its v alue is a VTY number an d is in the range of 0 to 4 by default. all : All the SSH channels. Description Using the debugging ssh serv er command, you can send the information such as the negotiation procedure provisione d in SSH 1.
View All views Parameter None Description Using the display rsa local-k ey-p air public command, you can display the publi c key portion of the server-end host key-p air and server key-pair . If no key has ever been created, the system will inform you that it has not found any keys by displaying “RSA keys not found” for example.
CF8EBE33 42C71357 FC241E4F DEB64C09 DA06995C 99859934 25F6800A AB8859BE 0F83FC63 15A3115C BD3A15E7 D52DCE19 324DBBF9 58DB936B 0203 010001 3.4 display rsa peer-public-key Syn tax display rsa peer-public-key [ brief | name keyname ] View All views Parameter brief : Displays the brief information of all the remote p ublic keys.
Key Code: 308186 028180 E75E3D7C 11923D33 143FB829 470EA018 889147F6 6F27A98A D6C54A36 C7DB17E1 647DC2BE F1C54116 641CD690 E5F7B492 A059BD6A B86A7D18 1040765C 978AF7C9 12807EAE 819B4A65 787CDE9C 940F74C8 BC4EFD81 6CC3EBDA 51E75D1B D073AA69 1F646A81 035496AC 6F98A730 D8C44931 598682EF EA40DF88 5DD98D45 2670231D 0201 2 5 3.
VTY0 1.5 DES Session started 3Com VTY3 1.5 DES Session started router 3.6 display ssh user-information Syn tax display ssh user-information [ usernam e ] View All views Parameter userna me : A valid SSH user name defined by AAA.
View Public key edit view Parameter hex-data : Public key dat a, which is a hexadecimal character string cod ed in the public key format. Description Using the hex command, you can in put the public ke y dat a. The public key that you input must be th e one randomly generate d by the SSH client program.
[3Com-rsa-key-code] hex C7DB17E1 647DC2BE F1C54116 641CD690 E5F7B492 A 059BD6A B86A7D18 [3Com-rsa-key-code] hex 1040765C 978AF7C9 12807EAE 819B4A65 787CDE9C 9 40F74C8 BC4EFD81 [3Com-rsa-key-code] hex .
Close the SSH process of task 36 on the route r . [3Com] kill ssh userid 36 3.9 protocol inbound Syn tax protocol inbound { ssh | telnet } numbers [ acl acl-number ] View System view Parameter ssh : Support s SSH. telnet : Supports T elnet.. numbers : S pecifies the maximum number of connec tion s that the protocol is allowed to set up.
3.10 public-key-code begin Syn tax public-key-code begin View Public key view Parameter None Description Using the public-key-code begin command, you can access the public key edi t view to input the public key data gene rated by the client program.
3.11 public-key-code end Syn tax public-key-code end View Public key view Parameter None Description Using the public-key -code end command, you can end the pub lic key editing and save the configure d public key . Besides, you can also u se this command to return from the public key view to the system view .
[3Com-rsa-public-key] public-key-code begin [3Com-rsa-key-code] hex 308186 [3Com-rsa-key-code] hex 028180 [3Com-rsa-key-code] hex E75E3D7C 11923D33 143FB829 470EA018 889147F6 6 F27A98A D6C54A36 [3Com-.
An essential operation underlying a succes sful SSH login is generating local RSA key-pairs by configuring rsa local-key -p air create . It is only necessary for you to execute this command on ce and you do not ha ve to execute it again af ter rebooting the router .
Description Using the rsa local-key-p air destroy command, yo u can des troy all the se rver-end RSA keys (including host key-p airs and server key-pairs). After inputting this command, you are req uired to confirm whet her to destroy all the server-end RSA keys.
When executing the undo rsa peer-pu blic-key command to delet e a specified public key , the system will prompt the following in formation in case the specified key does not exist. % Public key not found. For related commands, see public-key -code begin , and public-key-code end .
3.16 ssh server rekey-interval Syn tax ssh server rekey-interv al hours undo ssh server rekey -interval View System view Parameter hours : Updating interval which i s in the range of 1 to 24 hou rs. Description Using the ssh serv er rekey-interv al command, you can set the interval for up dating the SSH server key .
Parameter seconds : Login timeout time, which is in the rang e of 1 to 120 seconds and default s t o 60 seconds. Description Using the ssh server timeout command, you can set the login authentication timeout time at the SSH server end.
The public key that you assign to a user by using this command will replace t he one that you have assigned last time. The AAA module is responsible for the creati on and deletion of lo cal usernames in the system.
authentication-ty pe command, you can disable the login authentication mode for the user , in which case the user will be unable to log into the syste m. By default, no login authentication mode is spec ified, that is, the user is unable to log into the system.
Chapter 4 NTP Configuration Commands 4.1 debugging ntp-service Syn tax debugging ntp-service { acce ss | adjustment | authentication | ev ent | filter | p acket | p arameter | refclock | selection | s.
Description Using the debugging ntp-serv ice command, you can debug all the information of the NTP servi ce. Using the undo debugging ntp-serv ice command, you can disable the specified debugging. By default, debugging of all the information is di sabl ed.
******************************************************************** [12345]127.127.1.0 LOCAL(0) 7 26 64 1 0.0 0.0 15.6 [5]10.110.101.20 0.0.0.0 16 - 64 0 0.
Item Description root delay Total roundtrip delay to the master r eference source root disper The maximum error (dispersion) rela tive to the master reference source peer disper The dispersion of t he remote NTP serv er 4.4 display ntp-service trace Syn tax display ntp-service trace [ X.
4.5 ntp-service access Syn tax ntp-service access { query | synchronization | server | peer } acl-number undo ntp-service access { query | synchronization | serv er | peer } View System view Parameter query : Assigns the controlled query right. synchronization : Allows only the server to ac cess.
4.6 ntp-service authentication enable Syn tax ntp-service authentic ation enable undo ntp-service authen tication enable View System view Parameter None Description Using the ntp-service authen tication enable command, you can enabl e authentication of NTP services.
Description Using the ntp-servi ce authentication-key id command, you can set an NTP authentication key . Using the undo ntp-service authentica tion-key id command, you can remove the NTP authentication key . By default, there is no authentication key .
client mode to assume the wo rk of detecting the incoming b roadcast message packet s with which it can synch roni ze the local clo ck. Example Receive NTP broa dcast messages on the interface Ethernet 1. [3Com] interface Ethernet 1 [3Com-Ethernet1] ntp-service broadcast-client 4.
[3Com] interface Ethernet 0 [3Com-Ethernet0] ntp-service broadcast-server authentication-key 4 version 3 4.10 ntp-service max-dynamic-sessions Syn tax ntp-service max-dy namic-sessions numb er undo ntp-service max-dy namic-s essions View System view Parameter number : The number of sessions allowed at the local, which is i n the range of 0 to 128.
Parameter X.X.X.X : Multicast IP address, that is, Cl ass D address. Description Using the ntp-servi ce multicast-client command, you can enable the NTP multicast client mode. Using the undo ntp-service multicas t-client command, you can disable the NTP multica st client mode.
keyid : The key ID carried in the messag es transmitted to the multicast client s, which is in the range of 1 to 4294967295. ttl : Defines the Time-T o-Live (TTL) period of multicast packet s. ttl-number : The TTL perio d of multicast packet s, which is in the range of 1 to 255.
stratum : The stratum level at which the local clo ck op erates, which is in the rang e of 1 to 15. Description Using the ntp-serv ice refclock-master command, yo u can set an external reference clock or the l ocal clock to be t he NTP master cloc k.
In the event that authentic ation has been en abled, this com mand can be used fo r specifying one or more keys to be reliabl e. In other words, client s will only synchronize it s clock to the server providing a reliable key . Otherwise, clie nts will refuse synchronization.
destination addresses for receiving the response messages except for the specified one. Example S pecify the interface Ethernet 0 so that its IP address can be u sed as the source IP address carri ed by all the outbou nd NTP message p ackets. [3Com] ntp-service source-interface Ethernet 0 4.
undo ntp-service unicast-peer X.X.X.X View System view Parameter X.X.X.X : IP address of the remote server . vers io n : Defines NTP version numbe r . number : NTP version number in the range of 1 to 3. authentication-k eyid : Defines an auth entication key .
Example Set the peer at 128.108.22.44 to be the synchronization source of the local d evice, allowing the remote peer to synchronize with the local clock. In addition, version 3 is adopted, and IP address of Ethernet 0 is us ed as the IP source address carried by the NTP me ssag es.
Description Using the ntp-serv ice unicast-server command, you can enabl e the NTP server mode. Using the undo ntp-se rvice unicast-serv er command, you can disabl e the NTP se rver mode. By default, version number is 3, authentication i s enabled, and the server is not the preferred choice.
Chapter 5 X2T Configuration Commands 5.1 debugging x25 x2t Syn tax debugging x25 x2t { all | event | p acket } View All views Parameter all : Enables all X2T debug ging. event : Enables the X2T event debugging. p acket : Enables the X2T packet debugging.
Description Using the display x25 x2t route command, you can display the X2T static routing table. Example Display the X2T st atic routing table maint ained by the router . [Router] display x25 x2t route SID X.121 Ip Address ============================================== 1 12 321 10.
undo translate ip ip-address port po rt-number View System view Parameter ip-address : Local IP address. port port-num ber : TCP port number . x25 x.121-a ddress : The destination X.121 address af ter the address translation. Description Using the translate ip command, you can configure an X2T forwardi ng route from an IP network t o an X.
port port-num ber : TCP port number . Description Using the translate x25 comman d, you can configure an X2T forwarding route from the X.25 network to the IP network. Usi n g the undo translate x25 comm and, you can disable the configuration that has been made.
Chapter 6 Additional ISDN Configuration Commands 6.1 isdn ignore callednum Syn tax isdn ignore callednum undo isdn ignore calle dnum View ISDN BRI interface view , CE1/PRI inte rface view , CT1/PRI in.
Example Disable the E1 0 interface on the router to send SET UP ACK messages. [3Com] controller e1 0 [3Com-E1-0] pri-set [3Com-E1-0] interface serial 2:15 [3Com-serial2:15] isdn ignore callednum 6.
6.3 isdn ignore llc Syn tax isdn ignore llc undo isdn ignore llc View ISDN interface view Parameter None Description Using the isdn ignore llc command, the user can configure the SETUP message to ignore the low-level compatib ility information unit when a data call is initiated.
View ISDN BRI interface view , CE1/PRI inte rface view , CT1/PRI interface view Parameter None Description Using isdn waitconnect ack command, the user can configure the route r to wait for CONNECT ACK message replies from the connected exchange until switching to the ACTIVE state.
information of SPI on all the SPID-supported BRI interfa ces. Y ou may view one interface by specifying its type and nu m ber . Example Display the related information of SPID on the NI-supp orted inte rface bri 0/0/0.
View ISDN PRI interface view Parameter None Description Using the isdn ignore dchan comman d, you can configure the ISDN protocol to use consecutive numbering of B channel s during call ini tiation. 1 will be subtracted from all channel numbers after slot 17, to keep the contin uity of the channel serial number .
Parameter dss1 : DSS1 (Digital Subscribe r Signaling No.1) signa ling is u sed. ni: National ISDN signaling is used. Description Using the isdn protocol-type command, you can config ure signaling to be used at the ISDN interface. By default, DSS1 signaling is used.
Parameter timer-nam e : Name of Q931 timer . Refer to the following t able for a description in detail. time-interval : Interval of timer . Refer to the followi ng table for a description in deta il. all : T o be used to restore the default interval values of all the Q931 timers.
Parameter None Description Using the isdn spid auto-trigger command, you can enable S PID auto-negotiation once on the BRI interface running the NI protocol. On a BRI interface compliant with the No rth American ISDN protocol, the router can place a call only af ter SPID negotiation or initiali zation.
By default, NIT mode does not appl y on BRI interfaces. Instead, static SPID or dynamic SPID negotiation is applied. On an NI-compliant BRI interface, calls can be pla ced only after the SPID negotiation or initialization is finished.
This command applies only on NI-compliant BRI interfaces. Example Set the duration of TSPID on the interfa ce bri0 to 50 seconds. [3Com-bri0] isdn spid timer 50 6.12 isdn spid resend Syntax isdn spid resend times undo isdn spid re sen d View ISDN BRI Interface view Parameter times : An integer in the range of 1 to 255 times, which default s to 1.
6.13 isdn spid service Syntax isdn spid service [audi o | dat a | speech] undo isdn spid se rvice View ISDN BRI interface view Parameter audio : Supports a udio service.
6.14 isdn spid1 Syntax isdn spid1 spid undo isdn spid1 View ISDN BRI Interface view Parameter spid : S tring comprising 9 to 20 digit s. Description Using the isdn spid1 command, you can configure SPID information for t he B1 channel on an NI-compliant BRI interface.
View ISDN BRI Interface view Parameter spid : S tring comprising 9 to 20 digit s. Description Using the isdn spid2 command, you can configure SPID information for t he B1 channel on an NI-compliant BRI interface. Using the undo isdn spid2 comm and, you can remove the SPID information from the B1 ch annel on the interface.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il 3Com 10014302 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del 3Com 10014302 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso 3Com 10014302 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul 3Com 10014302 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il 3Com 10014302, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del 3Com 10014302.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il 3Com 10014302. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo 3Com 10014302 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
