About sysad43

sysad43 · 12-06-2025

I need some help understanding my spanning tree results.I have 2 routers connected to each other, and 3 switches in a loop. So R3-SWA-SWB-SWC-R2 and back to R3.I have set R3 as the root with the lowest priority 8192 , R2 next lowest 12284, and switch...

sysad43 · 11-25-2025

I have a 9300x-12Y (R3) with 12 25g fiber ports and it has a C9300X-NM-8M network module with 8 multigig ports.I have a switch (SWITCHA) plugged into TE1/1/1 via copper which is trunked and working as normal.I plugged in another switch (SWITCHB) to f...

sysad43 · 12-12-2024

The basic oddity is that when I run show ntp status or show clock the time is 10 hours off, but some switches that sync with it are correct. Is this a display bug of some sort where it shows the wrong time, but is actually right?I have a 3850 and a 3...

sysad43 · 08-27-2024

I am seeing what appears to be a botnet (mainly Brazil IPs) trying to brute force connect to my ASA on port 443. Hundreds of thousands of attempts per day, but slow enough not to trip threat detection. Ive created a acl group to block control plane ...

sysad43 · 08-13-2024

I am attempting to change our service policy to allow us to bypass firepower inspection for certain traffic like VOIP. However, Im a bit confused as to the effect running certain commands would have. Someone else set this up a long time ago with the ...

sysad43 · 12-08-2025

Fun follow up. Came in this morning with fixed spanning tree paths and users were complaining about slow speed. I traced it a bad 10g fiber connection which was not being used because of the path cost was wrong. But now its right, but the cable is ba...

sysad43 · 12-06-2025

Thanks, that did fix it. Its now pathing as expected.

sysad43 · 12-06-2025

I think the issue may be R2 is using long path cost method instead of short. I dont have anything faster than 10g so is there any danger in changing it from long to short? Or better to change everything to long?

sysad43 · 12-06-2025

They are all layer 3 switches, yes. The two routers are layer 3 switches. Thats why the confusion. I did just move everything from PVST to rapid-pvst, Do I need to somehow force a recalc of the cost?I have several switches choosing the higher cost as...

sysad43 · 11-30-2025

Fixing the native vlan and trunk mode seems to have fixed it. Im guessing the spanning tree wasnt converging fast enough.

Member Since	‎10-25-2016 12:34 PM
Date Last Visited	‎12-08-2025 02:30 PM
Posts	55
Total Helpful Votes Received	10

User Statistics

User Activity

spanning tree confusion

9300x-12Y Network Module Ports Shared?

3850 and 9200 switches showing odd NTP behavior

Disabling ASA SSL but Keep Ipsec

Bypass Firepower Inspection in Service Policy

Re: spanning tree confusion

Re: spanning tree confusion

Re: spanning tree confusion

Re: spanning tree confusion

Re: 9300x-12Y Network Module Ports Shared?