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New Member

3550 and 3560 - Unable to bring fiber interfaces up

Guys,

Not sure what I'm missing, however, I'm unable to bring a fiber interface up on two switches to trun. Below is the information from running conifig and show int. One swtich is at int gi0/1 and the other at int gi0/3. The link will be configured as a trunk eventually, but for now I just need it up.

Thanks for any and all assistance.

--------------------------

First Switch - Show run int gi0/1

!

interface GigabitEthernet0/1

switchport trunk encapsulation dot1q

switchport trunk native vlan 10

switchport mode trunk

logging event trunk-status

end

!

-- Second switch - Show run int gi0/3

!

interface GigabitEthernet0/3

switchport trunk encapsulation dot1q

switchport trunk native vlan 10

switchport mode trunk

end

--------------------------

First Switch - Show int gi0/1

GigabitEthernet0/1 is down, line protocol is down (notconnect)

  Hardware is Gigabit Ethernet, address is 000f.f791.7cb1 (bia 000f.f791.7cb1)

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

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

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Auto-duplex, Auto-speed, link type is auto, media type is 1000BaseLX

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

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

  Last input 00:31:32, output 00:31:36, 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

     14989 packets input, 17579854 bytes, 0 no buffer

     Received 290 broadcasts (0 multicast)

     0 runts, 0 giants, 0 throttles

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

     0 watchdog, 95 multicast, 0 pause input

     0 input packets with dribble condition detected

     109 packets output, 10360 bytes, 0 underruns

0 output errors, 0 collisions, 19 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

Switch 2 - Show int gi0/3

GigabitEthernet0/3 is down, line protocol is down (notconnect)

  Hardware is Gigabit Ethernet, address is 0019.e877.f21b (bia 0019.e877.f21b)

  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

  Auto-duplex, Auto-speed, link type is auto, media type is unknown

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

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

  Last input never, output never, 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 multicasts)

     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

     0 packets output, 0 bytes, 0 underruns

     0 output errors, 0 collisions, 7 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

-------------------------------

Switch1 - show int gi0/1 switchport

Name: Gi0/1

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: down

Administrative Trunking Encapsulation: dot1q

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 10 (VLAN0010)

Administrative Native VLAN tagging: enabled

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Administrative private-vlan trunk native VLAN: none

Administrative private-vlan trunk Native VLAN tagging: enabled

Administrative private-vlan trunk encapsulation: dot1q

Administrative private-vlan trunk normal VLANs: none

Administrative private-vlan trunk private VLANs: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

Protected: false

Unknown unicast blocked: disabled

Unknown multicast blocked: disabled

Appliance trust: none

Switch2 - Show int gi0/3 switchport

Name: Gi0/3

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: down

Administrative Trunking Encapsulation: dot1q

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 10 (DATA-WORKSTATION)

Administrative Native VLAN tagging: enabled

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Administrative private-vlan trunk native VLAN: none

Administrative private-vlan trunk Native VLAN tagging: enabled

Administrative private-vlan trunk encapsulation: dot1q

Administrative private-vlan trunk normal VLANs: none

Administrative private-vlan trunk associations: none

Administrative private-vlan trunk mappings: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

Protected: false

Unknown unicast blocked: disabled

Unknown multicast blocked: disabled

Appliance trust: none

------ Added info ---- Show version ---

Switch1

!

Cisco IOS Software, C3550 Software (C3550-IPBASEK9-M), Version 12.2(25)SEE2, REL

EASE SOFTWARE (fc1)

!

Switch2

Cisco IOS Software, C3560 Software (C3560-IPBASEK9-M), Version 12.2(55)SE3, RELEASE SOFTWARE (fc1)

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

!

Everyone's tags (3)
12 REPLIES
Hall of Fame Super Blue

3550 and 3560 - Unable to bring fiber interfaces up

What have you used to connect the switches ie. straight thru, crossover, fibre ?

Jon

New Member

3550 and 3560 - Unable to bring fiber interfaces up

It's a GBIC connector. When they are plugged into Dell Switches they light up without any issues

New Member

3550 and 3560 - Unable to bring fiber interfaces up

Hi,

take a look on gbic on interface gi0/3.

The media type is "unknown".

New Member

3550 and 3560 - Unable to bring fiber interfaces up

Yeah I noticed that. Not sure why it is taking into consideration it lights up when plugged into the Dell Switches. This is why I'm confused

New Member

3550 and 3560 - Unable to bring fiber interfaces up

both gbic´s are Cisco or are from other vendors?

New Member

3550 and 3560 - Unable to bring fiber interfaces up

How old are the Dell switches? Try "speed nonegotiate" on your interface.

New Member

3550 and 3560 - Unable to bring fiber interfaces up

Dell Switches are about 2 - 3 years old

I had already tried  the speed nonegotiate - retry again but it does not work still.

!

interface GigabitEthernet0/3

switchport trunk encapsulation dot1q

switchport trunk native vlan 10

switchport mode trunk

speed nonegotiate

end

001104: Jul 20 12:39:52.098: %LINK-3-UPDOWN: Interface GigabitEthernet0/3, changed state to down

!

interface GigabitEthernet0/1

switchport trunk encapsulation dot1q

switchport trunk native vlan 10

switchport mode trunk

logging event trunk-status

speed nonegotiate

end

!

000026: *Feb 28 18:51:11.249: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, chan

ged state to down

Purple

Re: 3550 and 3560 - Unable to bring fiber interfaces up

   Being fiber I assume you swapped transmit and recieve around to check .  Also verify it is a cisco gbic in the side that says unknown.

New Member

3550 and 3560 - Unable to bring fiber interfaces up

fiber

New Member

3550 and 3560 - Unable to bring fiber interfaces up

Guys,

Thanks for the assistance. We changed it to a genuine cisco and it's all good now.

Thanks for all the help. It's very much appreciated the prompt response which I received to my question.

New Member

3550 and 3560 - Unable to bring fiber interfaces up

If you didn't have cisco SFP's and you didn't have the hidden command to allow non-cisco sfp's to work, these ports should've been err-disabled?

New Member

3550 and 3560 - Unable to bring fiber interfaces up

Actually the port did go into err-disable state at times. Would you mind saying what is the hidden command to allow non-cisco sfp's to work.

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