[c-nsp] 6509 / 3750 link problem

[Brad Henshaw]

Glenn,

In addition to the other suggestions, I noticed the following in your
output:

Your side:
Full-duplex, 1000Mb/s, media type is LH

Their side:
Full-duplex, 1000Mb/s, link type is force-up, media type is 1000BaseLX
SFP

It's possible they've set 'speed nonegotiate' on their gig port. If so,
get them to remove this config on their end to allow autonegotiation
(which I always prefer for fibre links) or disable autonegotiation on
your end to match. Some Cisco gear won't bring a fibre link up by
default if autonegotiation isn't playing.

Regards,
Brad

 

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Glenn Tan
> Sent: Monday, 9 April 2007 8:56 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] 6509 / 3750 link problem
> 
> Hi
> 
> I am having a strange problem here...
> We're trying to connect to an uplink's Catalyst 3750 from one of our
> 6509 SUP720s via 1000base-LX over single-mode fiber and we 
> are having this weird problem where our router shows the 
> interface as down/down, whereas their router shows the 
> interface as up/up.
> 
> We have tested every portion of the fiber pair linking both 
> switches and have found nothing wrong. The wavelengths are 
> both the same, signal strengths are well within normal 
> ranges, and all cable loopback tests are successful and 
> indicate no problems.
> 
> GBIC on our side is:
>  Vendor Name       : CISCO-JDSU
>  Vendor OUI        : 0x0 0x1 0x9C 
>  Vendor PN         : JGBR12LY02332
> 
> GigabitEthernet3/9 is down, line protocol is down (notconnect)
>   Hardware is C6k 1000Mb 802.3, address is 0007.ec6d.4400 
> (bia 0007.ec6d.4400)
>   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)
>   Full-duplex, 1000Mb/s, media type is LH
>   input flow-control is off, output flow-control is desired
>   Clock mode is auto
>   
> 
> SFP on their side is:
> Vendor Name           :   CISCO-AVAGO
> Vendor Part Number    :   QFCT-5798LP
> 
> GigabitEthernet1/0/2 is up, line protocol is up (connected)
>   Hardware is Gigabit Ethernet, address is 0019.3014.a282 (bia
> 0019.3014.a282)
>   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)
>   Full-duplex, 1000Mb/s, link type is force-up, media type is 
> 1000BaseLX
> SFP
>   input flow-control is off, output flow-control is unsupported
> 
> Has anyone experienced this before?
> Any help from anyone is appreciated.
> 
> Thanks and cheers.
> 
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