sam,
I think the 2500 series uses the AUI port for Ethernet, so I think
this is why the hardware doesn't support 100/full. I guess they had to make
sacrifices for flexibility that, in hindsight, probably weren't necessary.
GM
-----Original Message-----
From: sam sneed [mailto:vristevski@;hotmail.com]
Sent: Thursday, November 14, 2002 3:21 PM
To: [EMAIL PROTECTED]
Subject: Re: full duplex or half duplex, how can you tell [7:57431]
this is about the comment
" You'd get a link but lots of collisions, eh? The half-duplex side would
receive while it was sending, because the full-duplex side would send
whenever it wanted. In other words, the 2500 side would report collisions,
assuming there was enough simultanesous traffic."
I hooked up a 2501 eth0 to a 3548 set to full duplex and speed 100.
Interestingly the link light on the router lights up but no the switch. The
switch sees the total link down and would not even bother sending. I plugged
it into an auto-neg port and it obviously worked. Here is the output from
switch.
Cisco3500-3#sh int fa0/17
FastEthernet0/17 is down, line protocol is down
Hardware is Fast Ethernet, address is 0002.fd45.4b91 (bia 0002.fd45.4b91)
MTU 1500 bytes, BW 0 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters 1y40w
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Cisco3500-3#
""Priscilla Oppenheimer"" wrote in message
news:200211141830.SAA03800@;groupstudy.com...
> The Long and Winding Road wrote:
> >
> > ""John Tafasi"" wrote in message
> > news:200211141056.KAA04663@;groupstudy.com...
> > > Hi,
> > >
> > > I have a cisco 2516 router with an ethernet interface. How
> > can I find out
> > if
> > > this inteface is full duplex or half duplex?
> >
> > plug it into a full duplex 100 mbs switch port and see if link
> > occurs?
>
> You'd get a link but lots of collisions, eh? The half-duplex side would
> receive while it was sending, because the full-duplex side would send
> whenever it wanted. In other words, the 2500 side would report collisions,
> assuming there was enough simultanesous traffic.
>
> I think the best answer is that the 2500 routers pre-date the full-duplex
> standard. I bet they don't do full-duplex.
>
> >
> > seriously, I believe all routers in the 25xx line are 10/half.
> >
> > there is no report on speed and duplex on routers that I can
> > find.
>
> That's annoying. I guess show run would show you a non-default setting,
but
> that's not too helpful.
>
> Priscilla
>
> > show int
> > on a switch gives you a status
> >
> > Encapsulation ARPA, loopback not set
> > Keepalive set (10 sec)
> > Auto-duplex, Auto-speed
> >
> > even on a router with a port that do duplex changes ( 3640
> > NM-4E )there is
> > no status.
> >
> > I don't have access to a router with a port that permits speed
> > and duplex
> > changes.so I can't compare.
> >
> >
> >
> > >
> > >
> > > Thanks
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=57469&t=57431
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