Upgrade Router? Please Help T.T

[ohforce55]

Hi,

I talked about upgrading router in one of my posts but wanted to be 100% sure the steps to upgrade the router.

two 3825 routers -> two 4331 routers  (Two circuits).

No HSRP config but EIGRP, BGP, and static.

After I configured everything to the new router, should I turn off the old secondary router first and then turn on one of the new routers and connect all cables besides the cable goes to other router from secondary router to the new router?

And then turn off the old primary router and turn on the new router and connect all cables to the new router?

I'm not sure about the cable that connects to each other..... When should I connect it?

Please let me know if there are anything I missed.....

Also there is an AAA config as well as TACAS...

Do I have to disable aaa new-model by commanding 'no aaa-new model' and once everything is okay, I enable it back?

What commands should I use and what should I check in order to verify everything works fine after upgrading the router?

Thank you!

[Georg Pauwen]

Hello,

are these redundant links ?

Either way, here is what I would do to minimize downtime:

1. Fully configure both new routers including local console access (line con 0/login local/username x password y). I would also include AAA and Tacacs, that way, you immediately know if it works. Since you have configured console access, you keep connectivity anyway

2. Make sure that the cables you are currently using in your old setup work in the new setup BEFORE you migrate.

3. Disconnect the link between the old routers, then disconnect the old secondary router, and connect the new secondary router.

4. Once the circuit connected to the new secondary router is up, disconnect the primary old router, and connect the new primary router.

5. Once the circuit on the new primary router is up, connect the cable between both new routers.

This is obviously just a suggestion, but changing the cables this way, downtime should be less than a minute.

Hope that helps...

[ohforce55]

Georg,

Thank you so much for your explanations!

Yes, it is redundant link.

1. Shouldn't I disable aaa new-model and enable at the very last step? I heard all config would be hidden if I enable it in the beginning. Is there anything else that I need to be aware of on the configuration perspective?

3,4. When you said, disconnect the old secondary router, you mean power it off? And connect all the cables from the old secondary to the new secondary router which was already turned on?

Thank you!

[paul driver]

Hello

When you said, disconnect the old secondary router, you mean power it off?

No, have all rtrs powered on, Just swap the cabling from old to new, starting with secondary rtrs

Just make sure the eigrp and bgp peerings are up and your route are being advertised between the rtrs

Take snaphot of the route table and peerings before and after each swap out

you should be good .

res
Paul

[ohforce55]

Thank you!

so

sh ip eigrp ne

sh ip bgp ne 

sh ip route 

??

Are there any other commands to use?

There are so many routes in the table ... Do I still need to check every single one of them?

[ohforce55]

Another question I have is the old router's license is ipservice.

c3825-advipservicesk9-mz.124-25d.bin

But the new router 4331's license is universal.

X86_64_LINUX_IOSD-UNIVERSALK9-M

I only see universal version when I downloaded the IOS for 4331.

There is only one license which is universal for 4331? I don't need to request the license for the router?

Thank you!