[c-nsp] full duplex mismatch speed - dynamips

[John Neiberger]

Do you have two Cisco devices separated by a non-Cisco device? Imagine this:


A ---- B --- C

A and C are Cisco devices, B is not. If B is a switch or a hub, it
will pass CDP frames from A to C, which can cause these weird
mismatches. It's not really a mismatch because A and C are not
actually directly connected. CDP just thinks they are because B is
letting them pass through transparently.

Is that what's happening in your situation?

On Tue, Aug 17, 2010 at 8:03 PM, Jeferson Guardia <jefersonf at gmail.com> wrote:
>  Guys,
>
> Anyone knows how to solve this on dynamips? (router with lan switch
> connection) - I thought that setting
> speed auto would solve it.
>
> R3#
> *Mar  1 00:12:08.323: %SYS-5-CONFIG_I: Configured from console by console
> *Mar  1 00:12:10.027: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed
> state t
> o up
> *Mar  1 00:12:11.027: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> FastEthern
> et0/0, changed state to up
> *Mar  1 00:12:23.527: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on
> Fast
> Ethernet0/0 (not full duplex), with Router FastEthernet1/3 (full duplex).
> *Mar  1 00:12:24.079: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on
> Fast
> Ethernet0/0 (not full duplex), with Router FastEthernet1/3 (full duplex).
> *Mar  1 00:12:26.295: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on
> Fast
> Ethernet0/0 (not full duplex), with Router FastEthernet1/3 (full duplex).
> *Mar  1 00:13:10.571: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on
> Fast
> Ethernet0/0 (not full duplex), with Router FastEthernet1/3 (full duplex).
> R3#
> R3#
> *Mar  1 00:13:59.455: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on
> Fast
> Ethernet0/0 (not full duplex), with Router FastEthernet1/3 (full duplex).
>
>
> Rgs,
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