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Forum Replies

  1. Hi,

    Here’s an example for the console and SSH:

    Configuring Cisco router for the first time

    Here’s an example to enable telnet server on your router or switch:

    R1(config)#line vty 0 4
    R1(config-line)#transport input telnet
    R1(config-line)#password cisco123
    R1(config-line)#transport input 
    R1(config-line)#login
    

    The configuration above will only ask for the password (cisco123). It’s also possible to use usernames/passwords instead:

    R1(config)#username admin password cisco123
    
    R1(config)#line vty 0 4
    R1(config-line)#login local
    

    And you can protect it with an acce

    ... Continue reading in our forum

  2. Hello Syedwaqas.

    When troubleshooting fibre based interfaces, there are some specific items that you should check:

    First of all, all of the issues brought up by Rene in this lesson are applicable to fibre optic connections as well. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces:

    1. Check the SFP or GBIC status by issuing the show inter status command. Here is an example from a production 3750 production switch that I have:
    3750_DC_1#show inter status
    Gi1/0/1   ***VOICE_SERVERS** connected    901        a-full a-
    ... Continue reading in our forum

  3. Hi Laz,
    According to point 3 as I understand …
    If the SFP Module is Single Mode (Like GLC-LH-SM1 SFP-GE-L2) then we have to use Single Mode Fiber or vice versa , right ?? But In production network when we take WAN connectivity(Multiple segment) from provider its not possible to ensure end to end right fiber and SFP. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ??

    br//zaman

  4. Hi Laz,
    Thanks for your explanation …
    So we have to KEEP same type for per active segment , right ??

    R1----------R2------------R3

    Suppose… Segment-1 : R1 to R2 [SFP Single Mode both end and Fiber also Single Mode ]
    And Segment-2 : R2 to R3 [Multimode SFP both end and Multimode Fiber ]

    The above is okk or not ?? Please correct me if I am wrong .Thx

    br//zaman

  5. In the Half-Duplex Interface issue, why the Fast Ethernet interface not supporting half duplex? I believe the Fast Ethernets can support both Full and Half Duplex mode. Please clear my doubt.

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