We have seven 3750 TS48 Ethernet switches and two 3750 TS16 Ethernet uplinks in a stack configuration:
3750 TS16 Ethernet Uplink #1 (priority 15)
3750 TS48 Ethernet Switch #1 (priority 1)
3750 TS48 Ethernet Switch #2 (priority 1)
3750 TS48 Ethernet Switch #3 (priority 1)
3750 TS48 Ethernet Switch #4 (priority 1)
3750 TS48 Ethernet Switch #5 (priority 1)
3750 TS48 Ethernet Switch #6 (priority 1)
3750 TS48 Ethernet Switch #7 (priority 1)
3750 TS16 Ethernet Uplink #2 (priority 9)
This stack configuration works fine; however, if all switches & uplinks in the stack are powered off and then powered on together, we have seen the two 3750 TS16 Ethernet Uplinks on the ends become stack masters at the same time. We thought the top 3750 TS16 Ethernet Uplink should be the stack master because it has this highest stack priority (15).
Any idea why we are sometimes getting two stack masters during a POR?
Your problem is with the statement "if all switches & uplinks in the stack are powered off and then powered on together".
Always power the unit you want to be master up first, let it completely initialize, then power the rest up. One thing that is odd is that one TS16 should reboot after seeing another master in the stack unless there is a cable problem with your stack cable. I have seen our 3750's fail to recognize their stack ports (and become masters) until we fiddle with the cables a bit, and then they will reboot and come up as member switches.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
Im studying the 100-105 book by Odom and am currently on the topic of Port security. I purchased a used 2960 and I'm trying to follow a...
While deploying a number of 18xx/2802/3802 model access points (APs), which run AP-COS as their operating platform. It can be observed on some occasions that while many of their access points were able to join the fabric WLC withou...
I am going to design and build an LAN network under a tunnel underground with long distance between the switches.
I will have 2 Catalyst switches and 8 Industrial IE3000, and they will be connected with fiber.
For now I am planning on use Layer-2 s...