[j-nsp] FW: 1000Base-T SFP shows Link Up without cable inserted

Thu Aug 15 21:34:07 EDT 2013

Hi Thong,

We experienced same difficulty on 3rd party 1000base-T SFP.

We are preparing few MX5 (JUNOS 11.4R7.5) new deployment, and figured
out all of our 3rd party 1000base-T SFP became UP even there is no
cable plugged in. Those 3rd party 1000base-T SFP came from different
vendors; they are working very well on M10i (JUNOS 10.4R4.5), and
Cisco 6509. We also have some 3rd party SFP-SX and LX, they work well
on MX5.

On Wed, Aug 14, 2013 at 5:02 AM, Thong Hawk Yen
<hawk.yen.thong at time.com.my> wrote:
> Hi Mathias,
>
> We have experience something quite similar with out MX480 BRAS as well. Can remember what version of Junos we were running but it was the "X" track  specifically for the subscriber management features instead of the "R" track. It was a 3rd party copper SFP as well.
>
> Regards
> thong
>
>
>> Date: Sun, 31 Mar 2013 21:55:36 +0200
>> From: mathias at nilings.se
>> To: juniper-nsp at puck.nether.net
>> Subject: [j-nsp] 1000Base-T SFP shows Link Up without cable inserted
>>
>> I've just upgraded two of my MX5-T boxes to 11.4R7.5 and after that my
>> 3rd party 1000Base-T SFP (Transmode originals based on Finisar) started
>> to show Link Up as soon as the SFP is inserted (no cable inserted).
>>
>> On 11.2R5.4 it worked as it should. 11.4R1.14 that the boxes came with
>> was also broken.
>>
>> Bug or feature? Has anyone used any Juniper original 1000Base-T SFPs on
>> the MX-5/10/40/80-T platform with JunOS 11.4?
>>
>> masun at solir1> show version
>> Hostname: solir1
>> Model: mx5-t
>> JUNOS Base OS boot [11.4R7.5]
>> JUNOS Base OS Software Suite [11.4R7.5]
>> JUNOS Kernel Software Suite [11.4R7.5]
>> JUNOS Crypto Software Suite [11.4R7.5]
>> JUNOS Packet Forwarding Engine Support (MX80) [11.4R7.5]
>> JUNOS Online Documentation [11.4R7.5]
>> JUNOS Routing Software Suite [11.4R7.5]
>>
>> masun at solir1> show chassis pic fpc-slot 1 pic-slot 1
>> FPC slot 1, PIC slot 1 information:
>> Type 10x 1GE(LAN) SFP
>> State Online
>> PIC version 2.26
>> Uptime 2 days, 23 hours, 7 minutes, 20 seconds
>>
>> PIC port information:
>> Fiber Xcvr vendor
>> Port Cable type type Xcvr vendor part number Wavelength
>> 0 GIGE 1000T n/a FINISAR CORP. FCLF8521P2BTL-TR n/a
>>
>> masun at solir1> show interfaces ge-1/1/0
>> Physical interface: ge-1/1/0, Enabled, Physical link is Up
>> Interface index: 158, SNMP ifIndex: 526
>> Description: Link sthir2 for Logical Systems (VPLS Lab)
>> Link-level type: Ethernet, MTU: 2000, Speed: 1000mbps, BPDU Error: None, MAC-REWRITE Error: None,
>> Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled, Auto-negotiation: Enabled,
>> Remote fault: Online
>> Device flags : Present Running
>> Interface flags: SNMP-Traps Internal: 0x0
>> Link flags : None
>> CoS queues : 8 supported, 8 maximum usable queues
>> Current address: 08:81:f4:81:26:68, Hardware address: 08:81:f4:81:26:68
>> Last flapped : 2013-03-31 15:11:42 EDT (00:04:46 ago)
>> Input rate : 0 bps (0 pps)
>> Output rate : 0 bps (0 pps)
>> Active alarms : None
>> Active defects : None
>> Interface transmit statistics: Disabled
>>
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>
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