03-09-2009 06:03 AM - edited 03-06-2019 04:28 AM
I am replacing a D-link with fiber connection that my predecessor installed. (It's unmanaged and doesn't recognize vlans.)
Current setup is D-link>>>fiber>>>media conv>>>4006 gig port.
However, I have tried 2 different 2950's (fiber port) using the same media conv and gig port on the 4006 and I cannot get a link to come up. I could understand the possibility of one 2950 having bad ports (unlikely as that may be) but not two different switches.
Here's the config for the pertinent ports on the 4006 and the 2950:
THIS IS THE 4006 PORT:
show int fa 5/38 switchport
Name: Fa5/38
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
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
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
Main_Switch#
THIS IS THE 2950 PORT:
show int gi0/2 switchport
Name: Gi0/2
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
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 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
I tried the "no shut" command on both ports and even tried turning off trunking. Neither of which helped.
This is a real "hair puller." Since the D-link operates over the same hardware, I would think the 2950 would, too.
Protected: false
Appliance trust: none
MOB1#quit
03-09-2009 06:21 AM
Hello Paul,
the port is down on the C2950 side
Operational Mode: down
you may need a cross-over cable or a straight cable between the port and the transceiver.
the D-link might be able to autosense the cable type and the gig uplink of the c2950 isn't.
This could explain what you see.
Hope to help
Giuseppe
03-09-2009 07:47 AM
Thanks, but no luck. I tried a Xover cable but that didn't make any difference.
03-09-2009 02:40 PM
On the 2950, can you do a "show post", "show run int Gi0/2", "show int Gi0/2" and "show int Gi0/2 status"?
03-10-2009 07:52 AM
Here is the readout from those commands:
show post
Passed
Mob1#show run int gi0/1
Building configuration...
Current configuration : 36 bytes
!
interface GigabitEthernet0/1
end
Mob1#show int gi01 /1
GigabitEthernet0/1 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is 0017.5a02.aed9 (bia 0017.5a02.aed9)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, media type is SX
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:08:38, 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
0 packets output, 0 bytes, 0 underruns
--More-- 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
Mob1#show int gi0/1 status
Port Name Status Vlan Duplex Speed Type
Gi0/1 notconnect 1 auto auto 1000BaseSX
Mob1#
03-09-2009 04:36 PM
Current setup is D-link>>>fiber>>>media conv>>>4006 gig port.
Are you replacing 2950 instead of D-Link
or your current setup is
2950>>Fiber>>>4006.
Could you please tell which Optical card (SFP/GBIC etc)you are using in 2950 and 4006 or check yourself? Cards in 2950 and 4006 shd be working on same wavelength?
It is possible that there is no problem with your configurationbut the wavelength of the optical card you are using in 2950 is not matching with your media converter/4006.
Have come across few cases on this forum where we are trying to find problem with switch config but problem is with wavlength of optical card.
03-10-2009 07:53 AM
I believe they are the same as we have a couple of 2950's in different closets that work fine with the same med conv and hooked up to the 4006.
We are replacing the D-link with a 2950.
03-10-2009 05:36 PM
As an addendum to my previous message:
I took some machines off-line so I could use the same media conv, fiber d/l as the "live" system (one using the d-link). this time I plugged in the 2950 in place of the d-link. I was able to get a link light showing activity on the media converter.
I next checked the gig port on the 4006. I did a show int on that port. It showed in the "up" state. This is something I hadn't seen before.
However, I got no replies when I pinged the 2950. Now, I'm really confused. I wouldn't think a show int would result in an "up" state (whereas before it was showing "down").
I would think it would only show "up" if the other end is also "up" and transmitting data.
03-10-2009 05:53 PM
Is trunking set up on both sides ? Can you post a show run of both interfaces ?
03-11-2009 08:35 AM
From the 4006:
interface GigabitEthernet2/18
description MMGDR
switchport trunk encapsulation dot1q
switchport mode trunk
speed 1000
duplex full
no snmp trap link-status
spanning-tree portfast
end
From the 2950:
ob1#show int gi0/1 switchport
Name: Gi0/1
Switchport: Enabled
Administrative Mode: dynamic desirable
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
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 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
Appliance trust: none
03-11-2009 11:22 AM
Hello Paul,
>> I would think it would only show "up" if the other end is also "up" and transmitting data.
But there is the media converter in the middle and it is this the endpoint for the C4006.
For this reason you can see up on one side while the other side is down.
Hope to help
Giuseppe
03-12-2009 07:01 AM
Thanks. Unfortunately, that still leaves the issue on why the 2950 is not connecting. Is there any diagnostic test that can be done to verify that the gig port is working?
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