That was correct. I changed the speed to 10 full duplex and got the link a
both sides.
I just thought it was odd that one side(router) had the link light on but
the switch didn't.
Cisco3500-3#sh int fa0/17
FastEthernet0/17 is up, line protocol is up
Hardware is Fast Ethernet, address is 0002.fd45.4b91 (bia 0002.fd45.4b91)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 10Mb/s, 100BaseTX/FX
""Priscilla Oppenheimer"" wrote in message
news:200211142203.WAA18335@;groupstudy.com...
> sam sneed wrote:
> >
> > 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.
>
> That's probably because of the speed mismatch not the duplex mismatch?
>
> In some cases you can get a link light and think everything is fine, when
> actually there are problems due to a duplex mismtach.
>
> I don't have the equipment to show you an example, but I know I've seen
it.
> Needless to say, it makes troubleshooting difficult.
>
> Priscilla
>
> > 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=57474&t=57431
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