Hi,
On an ethernet the router will say it is admin up and connection down when
nothing is seen at the end. This is common on most devices Cisco and non
Cisco. Most SNMP managed devices show this. It is a way of knowing the
service is avalable for use. In the Hub (repeater) days it was possible to
turn ports on and off even as a security arrangement (run different configs
for different times) This saves a lot of errors on SNMP as you can tell the
difference in the states easily.
Just some thoughts. (I think the up down is always the case if the link is
not there)
Teunis,
Hobart, Tasmania
Australia
On Thursday, April 26, 2001 at 05:47:34 PM, Priscilla Oppenheimer wrote:
> I tried to do some more research on this and couldn't get a good answer.
>
> Does anyone know exactly in which cases the router reports the interface
> up, down even if there is no cable attached? Looking at show interface
> ethernet,
>
> Router reports up, down with no cable for AUI.
>
> How about RJ45?
>
> How about MII?
>
> GMII?
>
> Others?
>
> Thanks
>
> Priscilla
>
>
>
> > > Priscilla
> > >
> > > At 08:21 PM 4/25/01, md. nazri wrote:
> > > >thanks for the answer...
> > > >i understand that LP will down if no connection attach, but why FE
still
> >up,
> > > >does it up forever until we shut it down? Does it apply the same to
> > > >Ethernet..?
> > > >----- Original Message -----
> > > >From: "Vincent Chong"
> > > >To:
> > > >Sent: Wednesday, April 25, 2001 3:48 PM
> > > >Subject: Re: FastEthernet is up, Line protocol down [7:1828]
> > > >
> > > >
> > > > > 1) I guess you enable the fastethernet port in the running
> > > > > configuration. You have to
> > > > > shutdown the port, so the port will administrative shut down
and
> >line
> > > > > protocol down.
> > > > >
> > > > > 2) Line protocol will up if there is any phyiscal connection
> >attached
> > > >to
> > > > > Fastethernet.
> > > > > Becasue the port in your router will detect keepalive signal,
> when
> >it
> > > > > detected, it will
> > > > > up. You can type no keepalive under interface configuration,
> >the
> > > > > ethernet interface
> > > > > will keep up even no physical connection. You have to enable
the
> > > > > interface, of courese.
> > > > >
> > > > > Hope this help
> > > > > Vincent Chong
> > > > >
> > > > >
> > > > >
> > > > > ""md. nazri"" hi all,
> > > > > > got one question regarding FastEthernet on Cisco 2620..
> > > > > > why the status showed FastEthernet is up, Line protocol down
> >although
> > > >the
> > > > > > cable was pulled out from the port...in what cases the port will
> > > >down..any
> > > > > > help appreciated
> > > > > >
> > > > > > tq
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> > >
> > > ________________________
> > >
> > > Priscilla Oppenheimer
> > > http://www.priscilla.com
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>
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
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