[c-nsp] GLC-T sfp problem

[Daniel Suchy]

Sorry for misinformation, one of my colleagues already noticed me that 
in some (new) hardware is possible 10/100/1000 operation. As I found, 
best place to found operational mode of GLC-T in certain hardware is 
"Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix" at
http://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_table09186a0080446625.html

There can be found where is supported 10/100/1000 operation. I have only 
hardware allowing 1000Base-T only (WS-X67xx, Sup720..) and also GLC-T 
has full name "1000BASE-T SFP transceiver", which supported my mistake.

Regards,
Daniel

On 05/11/2007 02:54 PM, saso pirnat wrote:
> Daniel Suchy wrote:
>> Hi,
>> GLC-T interface is 1000BaseT-only. You cannot connect 100BaseT devices
>> here. On 3560 you have 10/100/1000 ports.
>>
> 
> this is port which is conected with same GLC-T sfp to C3560, so sfp is
> 10/100/1000, but on c7600 is only suported mode 1000
> 
>>> sh int on 3560
>>> GigabitEthernet0/2 is up, line protocol is up (connected)
>>>   Hardware is Gigabit Ethernet, address is 0016.9d34.5482 (bia
>>> 0016.9d34.5482)
>>>   MTU 1500 bytes, BW 100000 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, link type is auto, media type is
>>> 10/100/1000BaseTX SFP
>>>   input flow-control is off, output flow-control is unsupported
>>>   ARP type: ARPA, ARP Timeout 04:00:00
>>>   Last input never, output 00:00:00, output hang never
>>>   Last clearing of "show interface" counters never
>>>   Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
>>>   Queueing strategy: fifo
>>>   Output queue: 0/40 (size/max)
>>>   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, 0 no buffer
>>>      Received 0 broadcasts (0 multicast)
>>>      0 runts, 0 giants, 0 throttles
>>>      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
>>>      0 watchdog, 0 multicast, 0 pause input
>>>      0 input packets with dribble condition detected
>>>      4501 packets output, 595675 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 PAUSE output
>>>      0 output buffer failures, 0 output buffers swapped out
> 
> The 1000BASE-T SFP can support 10/100/1000 speeds only on the Cisco
> Catalyst 2970, 3560, and 3750 Series Switches.
> 
> It is also possible to have the port auto-negotiate at a lower speed, or
> force a slower speed. Issue the show interface capabilities command in
> order to confirm whether a given GLC-T supports 10/100 speed on a switch.
> 
> Output from the show interface capabilities command can confirm whether
> a GLC-T can be run at a lower speed. The output also displays the
> capabilities of the specified interface, which includes the configurable
> features and options.
> 
> 
> br saso
> 

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