In Cisco switch, what are these physical port groups called?
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01-13-2022 03:58 PM
(see picture included in this post)
In a 48-port switch, four divisions are apparent. Sometimes half the switch goes bad (i.e. ports Gi1/0/25 to Gi1/0/48) while the first 24 ports continue to work just fine. What are these sections called?
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Catalyst 9000
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01-13-2022 04:07 PM
Switch ports.
There is no "division" or segregation involved.
"behind" those ports is an ASIC.
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01-13-2022 04:24 PM
Thanks Leo Laohoo.
In a 48-port switch like the 9300 series... is it one ASIC for all 48 copper ports?
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01-13-2022 06:11 PM
I could be mistaken but the 48-port 9300 may have 2 ASICs.
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01-13-2022 05:02 PM
had a power surge and 8 ports wouldn't come up. I was using sfp
transceivers (10GBASE-T SFP+ Copper RJ-45 30m Industrial Transceiver Module
for FS Switches) in all 8 ports. I had to RMA the switch. After the new
switch came, it too was having an issue with an asic group but a different
group of 8. I believe I have determined its a problem with the sfp and
technically not the switch. You can run into problems using third party
sfps. If I ran a reload command or hard reset the switch with the sfps
plugged in, the devices wouldn't come up no matter what I did. If I ran a
reload or hard reset without the sfps plugged in and waited a couple of
mintues after the reboot cycle and then plugged them in, the devices worked
fine. I'm not sure if this could be the issue for you bur thought I would
advise. Thanks!
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01-13-2022 05:05 PM
By the way, it was happening on a 9300.
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01-13-2022 06:36 PM - edited 01-13-2022 06:48 PM
Yeah, thanks Leo Laohoo, thanks sphillips.
I think we need someone to come in here and really explain this. I cannot find anything specific that shows a relationship specific between a group of ports and a specific ASIC.
All Cisco documentation I see talks about ASIC from the logical perspective, but I cannot find anything that specifically connects that to the specific ports by name/number.
I had the same problem as sphillips, multiple times, "a portion" of a Catalyst switch will stop working, just regular Gi copper ports, the whole section just quits (for example, from Gi0/25 to Gi0/48).... We've seen it in an older WS-C6504-E, a WS-C3850-48P and even in newer C9300-48P.
When this happens we RMA that switch.... Fine.
But I was hoping to gain a better understanding of how those divisions work and what are the specific technical names for it.
