Active/Standby SUP720 swap after reload

krygiermk · ‎04-02-2009

Hi,

I have two SUP720 supervisors in a 6509 running

s72033_rp-IPSERVICESK9-M 12.2(18)SXF11.

When I am on the console of the active supervisor and I issue a reload command the switch reboots but the module that I am on boots as the standby module.

I then have to swap console cables to the other SUP720. If I restart the switch by power it on and off the active/standby modules stay the same and do not change.

Any ideas?

Thank you in advance,

Michael Krygier

lamav · ‎04-02-2009

Michael:

When you issue the reload command on the active SUP module, it actually doesnt start the reboot process until a split second after the other SUP because it is responsible for issuing the command and placing it on the system bus. So, it doesnt start reloading until a few ms later.

When you power the switch off, its a clean start for both.

The first SUP to come online will be the active one.

Now, quite frankly, I have absolutely no idea if what I have just said is absolute nonsense, but it sounds good...may help you get by in a job interview. :-)

Leo Laohoo · ‎04-02-2009

Hi Michael,

This is a feature. It's very useful, say, you need to upgrade the IOS and you don't want any disruption. So you can, theoretically, reload the HOT module and still continue with traffic.

Giuseppe Larosa · ‎04-02-2009

Hello Michael,

>> When I am on the console of the active supervisor and I issue a reload command the switch reboots but the module that I am on boots as the standby module.

This is the reason for having two supervisors on the same chassis.

It is how sup processors redundancy works

Hope to help

Giuseppe