how to configure Dual SUP 7 on 4507 chassis for redundancy?

[m-abooali]

                   Hello,

I need to configure a 4507 chassis with two SUP 7 installed. I havenot done SUP redundancy comnfiguration and i was owndering if you can help me set in the right direction please!?

Thanks,

Masood

[Reza Sharifi]

Hi,

Have a look at the config guide. 

In order for the redundency to work correctly, you would need to configure both sups in SSO mode.

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/01xo/configuration/guide/NSFwSSO.html

HTH

[Ivan Shirshin · Accepted solution]

Hi,

First you need to correctly install HW, following this guide:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/configuration/notes/OL_23144.html#wp21932

Then you have to configure redundancy in IOS:

Switch# configure terminal 

Enter configuration commands, one per line. End with CNTL/Z.

Switch(config)# redundancy 

Switch(config-red)# mode sso 

Switch(config-red)# end

It is explained in more details in this document:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/01xo/configuration/guide/RPR.html#wp1125437

You may need to reset standby supervisor for the change to come into affect with a command "redundancy reload peer". The current configured and operation redundancy modes could be checked using "show redundancy" command.

Kind Regards,
Ivan

**Please grade this post if you find it useful.

[m-abooali]

Thanks so much.

so, after I cofigure using thiese command which I assume I am typing comands on teh primary SUP!?, then use:  command "redundancy reload peer" to complete the configuration?

to Test: can I slide out the Primary to see if the Standby will take on?

Thanks,

Masood

[m-abooali]

I hav eseen two different documnets explaining this configuration. one says:

Configuring SUP Engine Redundancy usinh RPR and SSO

the other one says:

Configuring Cisco NSF with SSO Sup engine redundancy

so, what is teh difference here?

Thanks,

Masood

[Ivan Shirshin]

Hi Masood,

Supervisor redundancy is local to the switch, ensuring minimal downtime on acitve sup failure by syncronizing l2/l3 information between them in SSO mode.

NSF builds on top of that and involves at minimum 2 routers, it allows for NSF router to continue forwarding packets when a supervisor engine switchover happens by preventing route-flapping so that the CEF routing table does  not time out or the  NSF router does not drop routes. An NSF-aware router  helps to send  routing protocol information to the neighboring NSF router.

This document describes it in details:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/31sg/configuration/guide/NSFwSSO.html#wp1131392

Kind Regards,
Ivan

**Please grade this post if you find it useful.

[m-abooali]

Thanks Reza.

I am looking at the documnet that you had sent a link. you mentoned it must be configure as SSO initially, correct? so, do I need to change the SSo to to RPR mode at all?

[Ivan Shirshin]

Hi Masood,

SSO is default in new releases, so it should be negotiated on router power up or on inserting a standby supervisor in a already running system (unless you have manually configured RPR or RPR+).

I don't think there is a benefit of reducing redundancy level from SSO to RPR or RPR+. SSO is a more complete mode (sync l2 and l3 function data) and provides minimal downtime switchover (should be sub-second), while RPR+ could take 30 seconds or more. Therefore, it is better to run SSO.

Kind Regards,
Ivan

**Please grade this post if you find it useful.

[m-abooali]

Thank you.

Masood

[Ivan Shirshin]

Welcome, Masood! Appreciate if you could rate this and other useful posts as well :-)

Kind Regards,
Ivan