topic Re: PnP with Switch Stack in Controllers

PnP with Switch Stack

Abhishek Dave — Fri, 01 Mar 2019 12:40:51 GMT

Hi Experts

we have a customer who has switch stack (member varies fro 3 4 ...8)

We have installed APIC EM and going to use PnP to manage those switches. We are not sure how to make a switch as Master in stack using APIC EM. is there a best practice to do that ? plz suggest

thanks

Abhishek

Re: PnP with Switch Stack

aradford — Sun, 17 Sep 2017 09:03:30 GMT

The stack master commands are done in exec mode, not config mode.

The best way to do this is to use an EEM script.

I have published an example in the past.

Adam

Re: PnP with Switch Stack

Abhishek Dave — Sun, 17 Sep 2017 09:06:45 GMT

thanks Adam for replying. can you please re-direct me to that example ?

Re: PnP with Switch Stack

aradford — Sun, 17 Sep 2017 09:17:27 GMT

Sure.

An overview of using EEM scripts in config is here Network Automation with Plug and Play (PnP) – Part 6

The specific script you need is:

line vty 5 15

login local

transport input ssh telnet

!

event manager applet POST_PNP

event timer countdown time 30

action 1.0 cli command "enable"

action 1.1 cli command "switch 1 priority 15" pattern "continue"

action 1.2 cli command "y"

action 1.8 cli command "config t"

action 2.3 cli command "no event manager applet POST_PNP"

action 2.8 cli command "end"

action 2.9 cli command "wr mem"

action 3.0 cli command "end"

end

Re: PnP with Switch Stack

aradford — Sun, 17 Sep 2017 09:20:53 GMT

BTW, what model switches are they?

Re: PnP with Switch Stack

Abhishek Dave — Sun, 17 Sep 2017 09:23:11 GMT

Thanks for sharing the post. These are 3850s.

Re: PnP with Switch Stack

Abhishek Dave — Sun, 17 Sep 2017 10:15:42 GMT

Hi Adam

I will try that out in LAB. Before that can you verify if below flow is correct :

sw-1........................

sw-2.......................... PnP

sw-3........................

sw-4.......................

there is a stack of 4 switches and PnP Server is also in place.

now in order to make sw-1 as master, I should use the eem script that you gave along with other template commands (like interface etc...) that I want on the switch. is that correct ?

Re: PnP with Switch Stack

aradford — Mon, 18 Sep 2017 07:33:36 GMT

That will make switch #1 master (after a re-election).

You also need to take into account the switch member number. Today, the only way to do that is via power-on order (top to bottom).

The reason that is important is your config file will contain interfaces which have the member number as the first number.

e.g. Gig1/0/10 will be stack member number 1, while Gig3/0/10 will be member number 3.

Stacking will support any switch contacting APIC-EM (as the PnP agent provides the serial numbers for all members of the stacks).

Adam