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default gateway

Posted on 2014-03-11
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Last Modified: 2014-03-26
I have this scenario. I have the alarm system on vlan10 with 10.10.10.100/24 subnet. Below is the snapshot of my network:

MPLS<-->Core switch2<-->access switch1<--alarm system.

 The alarm system doesn't need to be routed within my internal network. switch1 has DG as 10.10.200.1 (vlan200). my core is a layer 3 switch has SVI 200 with 10.10.200.1.

 
What is the DG for my alarm system?

Thanks
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Question by:leblanc
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8 Comments
 
LVL 57

Expert Comment

by:giltjr
ID: 39922228
If it really does not need to route, the you don't need to code one unless it requires you to.

If you have to code one and you really, really don't want/need it to route then code it as a IP address that does not exist  and document that IP address should NEVER be used.

However, just remember the alarm system does not have a valid default route, you have NO network access to it unless you are using a host that is on the same IP subnet.
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Expert Comment

by:pergr
ID: 39922821
... or if you use SOURCE NAT when connecting remotely to that network.
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Author Comment

by:leblanc
ID: 39957764
A DG needs to be configured for the alarm system. I have the alarm systems and its devices in its own vlan 200 (10.10.200.0/24). So I setup the DG as 10.10.200.1 which is the HSRP IP address for my 2 cores switches (10.10.200.2 and 10.10.200.3). I think that sounds correct. Any thoughts?
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giltjr earned 500 total points
ID: 39957787
If it need a route configured then it SHOULD o be an IP address on the same subnet, 10.10.10.0/24.

Some L3 switches will supporting being a router for a subnet it is not part of, but some devices require their default route to be on the same subnet as they are on.

To do this "correctly" you should configure a HSRP setup no your core switch for the 10.10.10.0/24 subnet and point the alarm system to that.
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Author Comment

by:leblanc
ID: 39957791
Yes. That is what I got. I configured hsrp on my core switches with 10.10.10.1 like I mentioned in my previous thread. Thx
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LVL 57

Expert Comment

by:giltjr
ID: 39957806
Please re-read your  previous posts.  You seem to be interchanging VLAN's and subnets.

In your original post you stated the alarm system was on VLAN 10, 10.10.10.0/24 and you had VLAN 200, 10.10.200.0/24.

In your prior  post you stated you were going to configure the alarm system to point 10.10.200.1, which is NOT the subnet you originally stated the alarm system is on.

I pointed this out and then you stated, yes, that is what I said 10.10.10.0/24?

So which is it, is the alarm system on 10.10.10.0/24 or on 10.10.200.0/24?  

If it is on 10.10.10.0/24, what default router did you code for it?
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Author Comment

by:leblanc
ID: 39957843
Yes sorry. They keep changing the subnets on me. Let say that the alarm system is 10.10.10.0/24. I have the DG as 10.10.10.1. My cores have hsrp as 10.10.10.1 and each of the core has 10.10.10.9 and 10.10.10.10 as the SVI IP address.
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Assisted Solution

by:giltjr
giltjr earned 500 total points
ID: 39957868
That will work.  O.K, just wanted to make sure everything was correct.
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