I have a design question that involves a Cisco ASA firewalls (2 actually, one of them is for failover), a stack of 3750 switches and a Cisco 3845 router. I am a little confused about how the equipment should be connected for optimal routing and switching at our data center.
Here's the scenario. We will have 3 VLAN's hosting different kinds of servers. These servers need to be accessed by all sites that are connected to our MPLS cloud. The 3845 router too will be connected to the MPLS cloud from our data center. The ASA's (also at the DC) will be connected to an Internet router for Internet connectivity.
So here are my questions:
1. how should the 3845 router be configured so that it routes traffic to different sites, but also provides access to the internet from servers in all different vlan's?
2. would i need to create a trunk port on each switch in the stack or just 1 trunk port for the stack should be enough?
3. would I need a router interface and an ASA interface on each vlan?
I am a little confused about this thing...So any help would be greatly appreciated!!
Ok, to make things simpler, lets assume I have a single 3750 switch which needs 2 VLAN's on it. The respective VLAN IP addresses on the 3750 will be the default gateway for the servers in those two respective vlan's. The 3750 switch will need to be connected to a 3845 router (which is connected to the MPLS cloud). OSPF will be configured for dynamic routing between the 3845 router and the 3750 switch.
My question now is:
1.) Can I use the native VLAN on the 3750 switch to connect to the 3845 router? Or should I create another VLAN on the 3750 for communication with the router?
2.) If the 3750 switch needs to connect to an ASA 5510 for the Internet, should that connection be on the native VLAN or a separate VLAN as well?
3.) If I need 2 DMZ's on the ASA, can I create additional VLAN's on the 3750 for the 2 DMZ equipment? If yes, then would the equipment in the DMZ's use the vlan interface as the default gateway or the will they use the ip address of the dmz interface as their default gateway?
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