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New Member

100BASE-BX10 SFP

Hi All,

I have several Cisco 3560C setup at multiple stations. The Cisco 3560C are connected in a daisy chain between each other using 100BASE-BX10-D and 100BASE-BX10-U SFP. So, on the first Cisco 3560C (station 1), I have a U-type connecting to the second Cisco 3560C (station 2.). The second Cisco 3560C (station 2) will have a D-type and U-type SFP where the D-type connects to the previous station 1 on its U-type SFP. This setup repeats for station 3 onwards.

It seems that these connections between the stations, I noticed that the Cisco switch registers the link at 100Mb half-duplex and I see incrementing CRCs and collisions. I am not able to hard-code the interface to 100Mb FULL as it seems that the interface configuration does not give me the option to do a 'speed 100' or 'duplex full'.

Is this normal for these kinds of SFP?

Below are some outputs:


Cisco IOS Software, C3560C Software (C3560c405-UNIVERSALK9-M), Version 12.2(55)EX3, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2011 by Cisco Systems, Inc.

Compiled Wed 10-Aug-11 07:37 by prod_rel_team

Image text-base: 0x00003000, data-base: 0x02100000

Switch(config)#do sh int status

Port      Name               Status       Vlan       Duplex  Speed Type

Fa0/1                        notconnect   15           auto   auto 10/100BaseTX

Fa0/2                        notconnect   15           auto   auto 10/100BaseTX

Fa0/3                        notconnect   15           auto   auto 10/100BaseTX

Fa0/4                        notconnect   15           auto   auto 10/100BaseTX

Fa0/5                        connected    15         a-full  a-100 10/100BaseTX

Fa0/6                        notconnect   15           auto   auto 10/100BaseTX

Fa0/7                        notconnect   15           auto   auto 10/100BaseTX

Fa0/8                        notconnect   15           auto   auto 10/100BaseTX

Fa0/9                        notconnect   15           auto   auto 10/100BaseTX

Fa0/10                       notconnect   15           auto   auto 10/100BaseTX

Fa0/11                       connected    trunk      a-full  a-100 10/100BaseTX

Fa0/12                       connected    trunk      a-full  a-100 10/100BaseTX

Gi0/1                        connected    trunk      a-half  a-100 100BaseBX-10U SFP

Gi0/2                        connected    trunk      a-half  a-100 100BaseBX-10D SFP


Switch#sh interfaces gigabitEthernet 0/2

GigabitEthernet0/1 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is c025.5c11.928d (bia c025.5c11.928d)

  Description:

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 254/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Half-duplex, 100Mb/s, link type is auto, media type is 100BaseBX-10D SFP

  input flow-control is off, output flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, 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 80000 bits/sec, 22 packets/sec

  5 minute output rate 16000 bits/sec, 16 packets/sec

     74931 packets input, 21611558 bytes, 0 no buffer

     Received 48734 broadcasts (39982 multicasts)

     0 runts, 0 giants, 0 throttles

     667 input errors, 667 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 39982 multicast, 0 pause input

     0 input packets with dribble condition detected

     23385 packets output, 3857612 bytes, 0 underruns

     0 output errors, 564 collisions, 1 interface resets

     0 babbles, 29 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 PAUSE output

     0 output buffer failures, 0 output buffers swapped out



5 REPLIES
Hall of Fame Super Gold

Re: 100BASE-BX10 SFP

reliability 254/255, txload 1/255, rxload 1/255

Possible fault with your fibre.  The value should be "255/255" and nothing else. 

This will explain your high CRC.

As to your duplex, I have no experience using the BX SFP so I don't know why your link has negotiated to "half duplex". 

Can you change the settings of the interface to full duplex?

New Member

100BASE-BX10 SFP

It is not just one fibre. All adjoining stations on the 100BASE-BX10 SFP are showing me 100 half-duplex.

Hall of Fame Super Gold

100BASE-BX10 SFP

In my opinion, you have two issues:

1.  You could have a faulty fibre optic link; and

2.  Half-Duplex. 

New Member

100BASE-BX10 SFP

Yes scope all connections with a 900 micron 200x scope, and clean anything you can.

GLC-FE-100BX-U

100BASE-BX10-U

-8

-14

-3

-28.2

GLC-FE-100BX-D

100BASE-BX10-D

-8

-14

-3

-28.2

If its clean, check the TX/RX power levels with a power meters.  End-to-end; bidirectional test, on both lamdas.

Because of the CWDM going on, I'm not sure I'd trust the internal "show hard" or

"show interfaces interface-id transceiver detail" internaly.

Obviously this is something common/systemic since it happens betwen multiple locations.

Is the fiber the common denominator?

100BASE-BX10 SFP

You might try the following commands, to see if you can get the interface to be release the a-half duplex mode.  

media-type gbic

no negotiation auto

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