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rg2
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New VRRP implementation

Thu Jun 25, 2015 12:06 am

Hello guys,

I will for the first time use VRRP for router redundancy and I have some questions.

My current configuration is very simple:

Image

And this is what I am aiming for:

Image

I am thinking about using VRRP so both Juniper 1 and Juniper 2 see one single virtual IP, and any of the routers (both Juniper and Mikrotik) can fail.

Is this possible? Should I do it another way?

Thank you!
 
patrick7
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Re: New VRRP implementation

Thu Jun 25, 2015 12:10 am

Possible, you have to add a VRRP address on Junipers and RouterOS. But why don't you do OSPF too there?
 
rg2
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Re: New VRRP implementation

Thu Jun 25, 2015 3:52 pm

Possible, you have to add a VRRP address on Junipers and RouterOS. But why don't you do OSPF too there?
I didn't think about OSPF because the "OSPF Area" in my diagram is my wireless network (ISP), and my routers are physically on another city on a data center. I buy the (redundant) connection from my wireless network to the data center from a carrier. I don't want to mix it up and make it too complex.

From what I see, VRRP is the most simple way to make it work.

My doubt is... as I understand, the virtual address must be on the same network as the real addresses, because it uses ARP to comunicate between the master and backup interfaces, for example:

Image

How would RouterOS1 and RouterOS2 know if each other is on or off? What about the Juniper, how would I configure two interfaces with the same IP? Do I need a layer 2 connection between them to make it work, like this: ?

Image

This way both RouterOS can find each other MAC address and I configure a single interface on the Junipers. Is this correct? Is there any other (better) way to do it?

Thanks!
 
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ZeroByte
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Re: New VRRP implementation

Thu Jun 25, 2015 4:35 pm

Possible, you have to add a VRRP address on Junipers and RouterOS. But why don't you do OSPF too there?
Agreed with this.
This way both RouterOS can find each other MAC address and I configure a single interface on the Junipers. Is this correct? Is there any other (better) way to do it?
VRRP is a poor man's "chassis failover" mechanism, and doesn't account for things like reachability beyond a router, etc.

Dynamic routing is much much better.
 
rg2
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Re: New VRRP implementation

Fri Jun 26, 2015 3:21 pm

I understand that OSPF is a better way to achieve redundancy, and I thank you for sharing your opinion.

But I would like to test both methods in lab, so I want to know if someone can answermy question about VRRP implementation.

Thanks!
:)