Switch command questions

xanderuk2xanderuk2 Member Posts: 21 ■□□□□□□□□□
in CCNA & CCENT
Good morning all :) (From Scotland time at least)

I have a couple of questions on some grey areas I have come across during studying this week so far. All Switch related…

First, in order to determine what ports on a switch (2900 series onwards) are configured as trunk ports, the following command will work:

Switch#show interfaces trunk
Or
Switch#show interfaces switchport

Also, when locating the root-bridge in a switch network, will the following command suffice:

Switch#show spanning-tree
Or do we have to specify a VLAN, such as VLAN1 to determine the root bridge? -
Switch#show spanning-tree VLAN1

As fas as I am aware, CCNA does not cover the whole "Spanning-tree instance per VLAN" which leads me to believe the 1st command will tell me what switch is the root bridge
I have been unable to find an answer to the above, and can't access the switches at work until Friday (after I have my exam)
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  • arayaray Member Posts: 15 ■□□□□□□□□□
    Switch#sh int ?
    ....
    trunk Show interface trunk information
    switchport Show interface switchport information

    (looks like that should do it)

    And
    Switch#sh int switchport
    Name: Fa0/1
    Switchport: Enabled
    Administrative Mode: dynamic desirable
    Operational Mode: static access
    Administrative Trunking Encapsulation: dot1q
    Operational Trunking Encapsulation: native
    Negotiation of Trunking: On
    Access Mode VLAN: 1 (default)
    Trunking Native Mode VLAN: 1 (default)
    Trunking VLANs Enabled: ALL
    Pruning VLANs Enabled: 2-1001

    and

    (I have no trunks)
    Switch#sh int trunk

    Switch#

    Not sure on the rest, but I hope this helps:

    Switch#sh spanning-tree

    VLAN0001
    Spanning tree enabled protocol ieee
    Root ID Priority 32769
    Address 000a.4143.9400
    This bridge is the root
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

    Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
    Address 000a.4143.9400
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
    Aging Time 300

    Interface Port ID Designated Port ID
    Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr
    ---
    Fa0/1 128.1 100 FWD 0 32769 000a.4143.9400 128.1
    Fa0/3 128.3 19 FWD 0 32769 000a.4143.9400 128.3
    Fa0/4 128.4 19 FWD 0 32769 000a.4143.9400 128.4
    Fa0/5 128.5 19 FWD 0 32769 000a.4143.9400 128.5
    Fa0/6 128.6 19 FWD 0 32769 000a.4143.9400 128.6
    Fa0/7 128.7 19 FWD 0 32769 000a.4143.9400 128.7
    Fa0/8 128.8 19 FWD 0 32769 000a.4143.9400 128.8

    Interface Port ID Designated Port ID
    Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr
    ---
    Fa0/10 128.10 19 FWD 0 32769 000a.4143.9400 128.10
    Fa0/11 128.11 19 FWD 0 32769 000a.4143.9400 128.11
    Fa0/12 128.12 19 FWD 0 32769 000a.4143.9400 128.12
    Fa0/13 128.13 19 FWD 0 32769 000a.4143.9400 128.13
    Fa0/14 128.14 19 FWD 0 32769 000a.4143.9400 128.14
    Fa0/15 128.15 19 FWD 0 32769 000a.4143.9400 128.15
    Fa0/16 128.16 100 FWD 0 32769 000a.4143.9400 128.16
    Fa0/17 128.17 19 FWD 0 32769 000a.4143.9400 128.17
    Fa0/18 128.18 100 FWD 0 32769 000a.4143.9400 128.18
    Fa0/19 128.19 19 FWD 0 32769 000a.4143.9400 128.19

    Switch#sh spanning-tree ?
    active Report on active interfaces only
    backbonefast Show spanning tree backbonefast status
    blockedports Show blocked ports
    bridge Status and configuration of this bridge
    detail Detailed information
    inconsistentports Show inconsistent ports
    interface Spanning Tree interface status and configuration
    pathcost Show Spanning pathcost options
    root Status and configuration of the root bridge
    summary Summary of port states
    uplinkfast Show spanning tree uplinkfast status
    vlan VLAN Switch Spanning Trees
    | Output modifiers
    <cr>
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  • xanderuk2xanderuk2 Member Posts: 21 ■□□□□□□□□□
    Thanks very much for your helpful reply :)

    Tell me what model of switch are you using?

    Is it a 2900 series?

    ~Rob
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  • arayaray Member Posts: 15 ■□□□□□□□□□
    Hi Rob,

    Yes, a 2948 -


    Cheers,
    Andrew
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  • wizarddeathwizarddeath Member Posts: 115
    The, show spanning-tree shows ALL vlans configured on the switch, so by issueing that command you can scroll through all the vlan setups. Also it is the show int trunk command.

    When are you going back for round 2? I was thinking this monday the 3rd.
    70-291 Next....
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  • xanderuk2xanderuk2 Member Posts: 21 ■□□□□□□□□□
    Round 2 with the CCNA exam is tomorrow for me :)
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  • mikej412mikej412 Member Posts: 10,086 ■■■■■■■■■■
    Round 2
    Good luck with those 2nd Rounds! icon_thumright.gif

    I'm glad I got my CCNA before they changed it to the tournament format! icon_lol.gif
    :mike: Cisco Certifications -- Collect the Entire Set!
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  • xanderuk2xanderuk2 Member Posts: 21 ■□□□□□□□□□
    *slow clap*

    icon_lol.gif
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  • wizarddeathwizarddeath Member Posts: 115
    Let us know how you do. My 5 day wait isnt over untill the 3rd. Even knowing now, what I know, I feel like I could pass. I went in with the attitude last time saying most people fail the first time so dont be mad with yourself. Now its ass kicking time!
    70-291 Next....
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  • xanderuk2xanderuk2 Member Posts: 21 ■□□□□□□□□□
    Passed!!

    96 percent this time. Finnished with half an hour to spare. Delighted :D

    Good luck wizard, you'll pass icon_cool.gif
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