HSRP Setup

I have a 4506 Core Switch that also acts as my network router.  I want to setup HSRP with a 3560 switch at an offsite location.  During the setup do I manually copy the routes from the 4506 to the 3560 or will HSRP do this after it is setup?

Thanks for your help.
JFSpicolyAsked:
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Don JohnstonInstructorCommented:
Are you setting up HSRP to operate? Or are you trying to have a device that you can swap out with?

If it's the former, both routers have to share a common network that they provide gateway services for. Does this offsite location meet that requirement?  If so, the routes may be specific to the device. Meaning that you wouldn't necessarily be able to simply copy the routes from the HSRP peer.

If it's the later, then yes. You can most likely copy the routes from the existing router.  Assuming they are static routes.
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JFSpicolyAuthor Commented:
We are directly connected to the offsite location via fiber so the 3560 is on the same network as the 4506.  I am trying to setup a DR solution in case some type of disaster takes the 4506 out of service.  If that happens, I would need the 3560 to take over the routing and keep the network functioning.  

The routes on the 4506 are static and there are currently no routes on the 3560.   Will HSRP copy the routes to the 3560 or do I need to do it manually?
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mikebernhardtCommented:
HSRP and routes have nothing to do with each other, other than the next hop of a static route might be a HSRP address. And any static routes on the 4506 and 3560 would not have a next hop of their own HSRP addresses. So you have to copy over any routing you need to do.

Also if you have other routers pointing to the 4506 with static routes, and they connect on the same LAN that the 4506 and 3560 share, then you will need to make sure that their configured next hop is updated to be the HSRP address. Then they should auto-fail to the 3560 if the 4506 goes down.
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Don JohnstonInstructorCommented:
We are directly connected to the offsite location via fiber so the 3560 is on the same network as the 4506.
That may not the same thing.   The primary function of HSRP is to provide first hop redundancy. Or put another way; redundant default gateway function.  So are the hosts at one site on the same network (broadcast domain) as the 3560 at the other site (or vice-versa)?  If they are not, then HSRP probably isn't going to be any benefit.

I am trying to setup a DR solution in case some type of disaster takes the 4506 out of service.
Is the 3560 or 4506 required in order for traffic to cross the link which connects the sites?

Will HSRP copy the routes to the 3560 or do I need to do it manually?
Like Mike said, routes and HSRP are independent of each other. But if the route that the 4506 uses is the same route that the 3560 would use, then it's possible that they would have the same routes.  But you would have to manually create them as that's not the job of HSRP.

It would really help to see the topology you've got as there are a few gray areas as to what you have.
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JFSpicolyAuthor Commented:
The offsite location is our DR site where our servers replicate.  The 3560 is there to connect the DR VM server to the DR SAN, connect our firewall and filters to the Internet and connect back to the 4506 at our main location.  There are normally not any active servers running at that location.

If the 4506 and our production servers were out of service, we would have to run on the replicated servers at the DR site.  There would need to be a router/gateway there so that the servers would still be able to get out via the gateway they are expecting.  I would like the 3560 to be able to perform that function.  

Working on getting a usable topology.
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Don JohnstonInstructorCommented:
If traffic has to go through the 4506 to get from the production site to the DR site, then the 4506 is a single point of failure.
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JFSpicolyAuthor Commented:
That is correct.  That is why I need the 3560 to back it up.  There are plans to replace the 4506 with redundant 4503's at the production site but for now I need something to cover the routing if I need to run off the replicated servers in an emergency.
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Don JohnstonInstructorCommented:
That is correct.  That is why I need the 3560 to back it up.
But if the 4506 fails, and the 3560 is at the DR site, that's not going to help the hosts at the production site.

There are plans to replace the 4506 with redundant 4503's at the production site but for now I need something to cover the routing if I need to run off the replicated servers in an emergency.
The other issue is that even with a pair of 4503's at the production site, you've still got the single point of failure that is the link and where it connects at the production site.

DR planning can be frustrating. :-(

Do you have internet connections at each site?
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JFSpicolyAuthor Commented:
If we lose the connection to the DR site and are running off of the replicated servers, users will access them from Business Continuity desks at the DR location.  They will also use VPN connections or Citrix Remote Desktops from any Internet connection they can find.
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Don JohnstonInstructorCommented:
Okay. That makes sense.

Are the replicated servers at the DR site on the same IP network (broadcast domain) as the live servers are the production site?
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JFSpicolyAuthor Commented:
Yes they are.
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Don JohnstonInstructorCommented:
It's unlikely that the 4506 and 3560 will have the exact same routes. So copying them probably won't work. Which means that you'll need to create the routes on the 3560 manually.

But HSRP still might not be the solution you're looking for. Here's why: With HSRP, one of the routers will be "active". Meaning all the traffic destined to off-net locations will be handled be that one router. If it's the 4506, then all non-local traffic will have to cross the DR-Production link in order to be processed.  If that's okay or desirable, then you should be all set.
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JFSpicolyAuthor Commented:
Thanks for your help.
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