SG-500 DAC link status

janpieter.sollie1 · ‎03-09-2020

I want to connect a Cisco SG-500 switch to a Unifi 16XG switch.

I bought 2 SFP+ DAC cables.

When I create a loop from 16XG (port 3<->4), the connection lights blink

When I create a loop on SG-500 (port 25<->26), the connection lights blink as well.

When I connect the Unifi to the Cisco switch, the connection fails: no LEDs blink.

Both switches seem to recognise a passive transceiver is connected, but no connection is established.

How do I debug the negotiation process?

marce1000 · ‎03-09-2020

- Check the logs of the SG-500 when the connection is attempted.

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

janpieter.sollie1 · ‎03-09-2020

Unfortunately, that doesn't help too much:

2147478559 	2020-Mar-09 15:30:02	Informational 	%LINK-I-CHNGCOMBOMEDIA: Media changed from copper media to fiber media on port gi1/26.   
2147478560 	2020-Mar-09 15:30:01	Informational 	%NSFP-I-SFPGibicDetected: gi1/26 SFP port is present

These are the logs when unplugging / reinserting the DAC cable. That's it :(

I also checked the remote syslog server, but that one did not help either:

2020-03-09T15:59:45+01:00 fp-sw2 LINK %LINK-I-CHNGCOMBOMEDIA: Media changed from fiber media to copper media on port gi1/26.
2020-03-09T15:59:45+01:00 fp-sw2 LINK %LINK-I-CHNGCOMBOMEDIA: Media changed from fiber media to copper media on port gi1/26.
2020-03-09T15:59:48+01:00 fp-sw2 LINK %LINK-I-CHNGCOMBOMEDIA: Media changed from copper media to fiber media on port gi1/26.
2020-03-09T15:59:48+01:00 fp-sw2 LINK %LINK-I-CHNGCOMBOMEDIA: Media changed from copper media to fiber media on port gi1/26.
2020-03-09T16:00:12+01:00 fp-sw2 LINK %LINK-I-Up:  gi1/25
2020-03-09T16:00:12+01:00 fp-sw2 LINK %LINK-I-Up:  gi1/25
2020-03-09T16:00:12+01:00 fp-sw2 LINK %LINK-I-Up:  gi1/26
2020-03-09T16:00:12+01:00 fp-sw2 LINK %LINK-I-Up:  gi1/26
2020-03-09T16:00:13+01:00 fp-sw2 LINK %LINK-I-CHNGCOMBOMEDIA: Media changed from copper media to fiber media on port gi1/25.
2020-03-09T16:00:13+01:00 fp-sw2 LINK %LINK-I-CHNGCOMBOMEDIA: Media changed from copper media to fiber media on port gi1/25.
2020-03-09T16:00:13+01:00 fp-sw2 LINK %LINK-W-Down:  gi1/25
2020-03-09T16:00:13+01:00 fp-sw2 LINK %LINK-W-Down:  gi1/25
2020-03-09T16:00:14+01:00 fp-sw2 LINK %LINK-W-Down:  gi1/26
2020-03-09T16:00:14+01:00 fp-sw2 LINK %LINK-W-Down:  gi1/26
2020-03-09T16:00:15+01:00 fp-sw2 LINK %LINK-I-Up:  gi1/25, aggregated (1)
2020-03-09T16:00:15+01:00 fp-sw2 LINK %LINK-I-Up:  gi1/25, aggregated (1)
2020-03-09T16:00:15+01:00 fp-sw2 LINK %LINK-I-Up:  gi1/26, aggregated (1)
2020-03-09T16:00:15+01:00 fp-sw2 LINK %LINK-I-Up:  gi1/26, aggregated (1)
2020-03-09T16:00:15+01:00 fp-sw2 LINK %LINK-W-Down:  gi1/25, aggregated (1)
2020-03-09T16:00:15+01:00 fp-sw2 LINK %LINK-W-Down:  gi1/25, aggregated (1)
2020-03-09T16:00:15+01:00 fp-sw2 LINK %LINK-W-Down:  gi1/26, aggregated (1)
2020-03-09T16:00:15+01:00 fp-sw2 LINK %LINK-W-Down:  gi1/26, aggregated (1)
2020-03-09T16:00:16+01:00 fp-sw2 LINK %LINK-I-CHNGCOMBOMEDIA: Media changed from fiber media to copper media on port gi1/25.
2020-03-09T16:00:16+01:00 fp-sw2 LINK %LINK-I-CHNGCOMBOMEDIA: Media changed from fiber media to copper media on port gi1/25.

And the NSFP log:

syslogserver:/var/log/fp-sw2# cat NSFP.log
2020-03-09T15:59:44+01:00 fp-sw2 NSFP %NSFP-I-SFPGibicRemoved: gi1/26 SFP port is not present
2020-03-09T15:59:44+01:00 fp-sw2 NSFP %NSFP-I-SFPGibicRemoved: gi1/26 SFP port is not present
2020-03-09T15:59:47+01:00 fp-sw2 NSFP %NSFP-I-SFPGibicDetected: gi1/26 SFP port is present
2020-03-09T15:59:47+01:00 fp-sw2 NSFP %NSFP-I-SFPGibicDetected: gi1/26 SFP port is present
2020-03-09T16:00:12+01:00 fp-sw2 NSFP %NSFP-I-SFPGibicDetected: gi1/25 SFP port is present
2020-03-09T16:00:12+01:00 fp-sw2 NSFP %NSFP-I-SFPGibicDetected: gi1/25 SFP port is present
2020-03-09T16:00:15+01:00 fp-sw2 NSFP %NSFP-I-SFPGibicRemoved: gi1/25 SFP port is not present
2020-03-09T16:00:15+01:00 fp-sw2 NSFP %NSFP-I-SFPGibicRemoved: gi1/25 SFP port is not present

These logs are taken by first unplugging / plugging port 26 (while attached to Unifi switch), pause 20sec, and next plugging DAC cable into port 25 (thus creating a link between port 26 and 25 instead of 26<-> Unifi. The results do not show anything (imo)

janpieter.sollie1 · ‎03-09-2020

*EDIT: at 16h04, the link came up (miraculously), I did not modify anything after 16h00:
2020-03-09T16:04:55+01:00 fp-sw2 LINK %LINK-I-Up: gi1/26, aggregated (1)
2020-03-09T16:04:55+01:00 fp-sw2 LINK %LINK-I-Up: gi1/26, aggregated (1)
2020-03-09T16:04:55+01:00 fp-sw2 LINK %LINK-W-Down: Po4
2020-03-09T16:04:55+01:00 fp-sw2 LINK %LINK-W-Down: Po4
2020-03-09T16:04:57+01:00 fp-sw2 LINK %LINK-I-Up: Po4
2020-03-09T16:04:57+01:00 fp-sw2 LINK %LINK-I-Up: Po4
2020-03-09T16:04:55+01:00 fp-sw2 TRUNK %TRUNK-W-PORTREMOVED: Port gi1/27 removed from Po4
2020-03-09T16:04:55+01:00 fp-sw2 TRUNK %TRUNK-W-PORTREMOVED: Port gi1/27 removed from Po4
2020-03-09T16:04:55+01:00 fp-sw2 TRUNK %TRUNK-W-PORTREMOVED: Port gi1/28 removed from Po4
2020-03-09T16:04:55+01:00 fp-sw2 TRUNK %TRUNK-W-PORTREMOVED: Port gi1/28 removed from Po4
2020-03-09T16:04:57+01:00 fp-sw2 TRUNK %TRUNK-I-PORTADDED: Port gi1/27 added to Po4
2020-03-09T16:04:57+01:00 fp-sw2 TRUNK %TRUNK-I-PORTADDED: Port gi1/27 added to Po4
2020-03-09T16:04:57+01:00 fp-sw2 TRUNK %TRUNK-I-PORTADDED: Port gi1/28 added to Po4
2020-03-09T16:04:57+01:00 fp-sw2 TRUNK %TRUNK-I-PORTADDED: Port gi1/28 added to Po4
2020-03-09T16:04:57+01:00 fp-sw2 TRUNK %TRUNK-I-PORTADDED: Port gi1/26 added to Po4
2020-03-09T16:04:57+01:00 fp-sw2 TRUNK %TRUNK-I-PORTADDED: Port gi1/26 added to Po4
Anyone who knows what might have happened?

Thank you!

marce1000 · ‎03-10-2020

- Is there anything in the logs of the unifi (too) ?

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '