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Enthusiast

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

                   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

1 ACCEPTED SOLUTION

Accepted Solutions
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Cisco Employee

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.

Kind Regards,
Ivan

View solution in original post

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Hall of Fame Expert

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

Highlighted
Cisco Employee

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.

Kind Regards,
Ivan

View solution in original post

Highlighted

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

Highlighted

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

Highlighted

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.

Kind Regards,
Ivan
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Enthusiast

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?

Highlighted

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.

Kind Regards,
Ivan
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Thank you.

Masood

Highlighted

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

Kind Regards,
Ivan

Kind Regards,
Ivan
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