a very wired thing !!!!!!

CCIE_2011CCIE_2011 Member Posts: 134
in CCNP
Morning all ... just a couple of days take the BCMSN :)

today will doing some labs. I hard code two ports on different switches with different speed

[SW] (speed 100, full duplex)
( speed 10, full duplex) [SW]

now shouldn't i get speed mismatch ... atleast the link should come up .... But unfortunatly the link is totally down at both end... i never thought the link won't come up totally?!!
I'm using 3560 switchs. Also tried it on 2900XL, I have only one, Just connected back to back to try this .
PS: also tried half duplex ... same thing.
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  • ReardenRearden Member Posts: 222
    Speed matches are a deal breaker. The link simply won't come up.
    More systems have been wiped out by admins than any cracker could do in a lifetime.
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  • CCIE_2011CCIE_2011 Member Posts: 134
    Rearden wrote:
    Speed matches are a deal breaker. The link simply won't come up.

    So we don't get any indicator about this ..... ?
    I was struggling for an hour .... think that the port is malfuntioning. then found that speed is not the same !
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  • ReardenRearden Member Posts: 222
    I don't know what type of error messages you get on a speed mismatch, although the link won't come up as far as I know.
    More systems have been wiped out by admins than any cracker could do in a lifetime.
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  • tech-airmantech-airman Member Posts: 953
    CCIE_2011 wrote:
    Morning all ... just a couple of days take the BCMSN :)

    today will doing some labs. I hard code two ports on different switches with different speed

    [SW] (speed 100, full duplex)
    ( speed 10, full duplex) [SW]

    now shouldn't i get speed mismatch ... atleast the link should come up .... But unfortunatly the link is totally down at both end... i never thought the link won't come up totally?!!
    I'm using 3560 switchs. Also tried it on 2900XL, I have only one, Just connected back to back to try this .
    PS: also tried half duplex ... same thing.

    CCIE_2011,

    What kind of patch cable are you using between the two switches?
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  • CCIE_2011CCIE_2011 Member Posts: 134
    tech-airman wrote:
    CCIE_2011 wrote:
    Morning all ... just a couple of days take the BCMSN :)

    today will doing some labs. I hard code two ports on different switches with different speed

    [SW] (speed 100, full duplex)
    ( speed 10, full duplex) [SW]

    now shouldn't i get speed mismatch ... atleast the link should come up .... But unfortunatly the link is totally down at both end... i never thought the link won't come up totally?!!
    I'm using 3560 switchs. Also tried it on 2900XL, I have only one, Just connected back to back to try this .
    PS: also tried half duplex ... same thing.

    CCIE_2011,

    What kind of patch cable are you using between the two switches?

    Cross
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  • CucumberCucumber Member Posts: 192
    CDP should inform you about the mismatch
    Try
    duplex auto

    And the link should come up

    Edit: Oh if that doesnt work I would check into a BPDU/port blocking thing
    I hate pandas
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  • dtlokeedtlokee Member Posts: 2,378 ■■■■□□□□□□
    Cucumber wrote:
    CDP should inform you about the mismatch
    Try
    duplex auto

    And the link should come up

    Edit: Oh if that doesnt work I would check into a BPDU/port blocking thing

    CDP can't help with a speed mismatch which is what he had. When there is a speed mismatch the keepalives don't work correctly so the line protocol can't come up, so no CDP.
    The only easy day was yesterday!
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  • CucumberCucumber Member Posts: 192
    I stand corrected.
    CDP informs when there is a duplex mismatch not when there is an speed mismatch.
    icon_redface.gif
    I hate pandas
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  • NetwurkNetwurk Member Posts: 1,155 ■■■■■□□□□□
    Looks like he's purposely making the speeds and/or duplex mismatch

    I'm assuming he knows how to fix things, I think he's just asking why it behaves the way it does with the various settings.

    Here's a link with all kinds of mismatch scenarios for ya

    http://www.cisco.com/warp/public/473/46.html

    Connecting a 2900 to a 3560, you would of course use

    duplex auto
    speed auto

    or

    duplex full
    speed 100

    or

    duplex auto
    speed 100

    or

    duplex full
    speed auto


    anything else just ain't gonna work
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  • CCIE_2011CCIE_2011 Member Posts: 134
    Netwurk wrote:
    http://www.cisco.com/warp/public/473/46.html

    thanks for the link dude :)
    . : | : . : | : .
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