01-23-2018 12:31 PM - edited 03-08-2019 01:32 PM
I am working with 4 C385048U boxes.
version: 16.03.05b
Stolz#sh sw stack-ports summary
Sw#/Port# Port Status Neighbor Cable Length Link OK Link Active Sync OK #Changes to LinkOK In Loopback
-------------------------------------------------------------------------------------------------------------------
1/1 OK 4 50cm Yes Yes Yes 1 No
1/2 OK 3 100cm Yes Yes Yes 1 No
2/1 OK 3 50cm Yes Yes Yes 1 No
2/2 OK 4 50cm Yes Yes Yes 1 No
3/1 OK 1 100cm Yes Yes Yes 1 No
3/2 OK 2 50cm Yes Yes Yes 1 No
4/1 OK 2 50cm Yes Yes Yes 1 No
4/2 OK 1 50cm Yes Yes Yes 1 No
Stolz#sh sw
Switch/Stack Mac Address : 706b.b920.0480 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
1 Standby c444.a0e8.8f00 1 V06 Ready
2 Member cc5a.53e8.5d80 1 V06 Ready
3 Member cc5a.5365.7a80 1 V06 Ready
*4 Active 706b.b920.0480 1 V06 Ready
After each reboot logical sw number is different from fisical sw location.
Can someone help to show sw law construction?
Solved! Go to Solution.
01-23-2018 03:58 PM - edited 01-23-2018 04:02 PM
Hello
If all hardware,software versions and switch numbers/ priorities are the same then stack election can be dependent on the longest uptime between the members participating in the election and if these are the same then the switch member with the lowest base MAC address will become the master.
Note:
1) switch renumbering depicts the interface numbering of the in the switch stack
2) switch priorities define the preferred role a switch can take within the stack - hugest most preferred
Review here:
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/71925-cat3750-create-switch-stks.html
Res
Paul
01-23-2018 02:07 PM - edited 01-23-2018 02:10 PM
Hello
Switch x priority 15 < preferred for master switch
Switch x priority 13 < preferred for standby switch but will become master is master fails
Switch x priority 11 < preferred for a member switch will become standby if standby fails or become master is both current master and standby fails
Switch x priority 9 < etc,.....
res
Paul.
01-23-2018 03:08 PM
What is the relation between logical switch number and phisical switch position in the stack?
which law regulates the members choice?
01-23-2018 03:58 PM - edited 01-23-2018 04:02 PM
Hello
If all hardware,software versions and switch numbers/ priorities are the same then stack election can be dependent on the longest uptime between the members participating in the election and if these are the same then the switch member with the lowest base MAC address will become the master.
Note:
1) switch renumbering depicts the interface numbering of the in the switch stack
2) switch priorities define the preferred role a switch can take within the stack - hugest most preferred
Review here:
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/71925-cat3750-create-switch-stks.html
Res
Paul
01-24-2018 11:47 AM
Thanks.
Now I understand.
I have made tests and worked fine.
Finally a have found out that mode button helps to identify the physical position of each switch in the stack.
01-24-2018 12:56 PM
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