I've been asked to assist in the design of a "OOB" management network, but I have a limited number of resources available. I have the following:
- 1 Cisco 3750-X stack pair w/ a C3KX-NM-1G network module in each.
- 8 Cisco 2960-24TC-L "aggregate" switches.
We run a Layer 2 Collapsed Core network topology with a Cisco 6509-E VSS core. We have 128 access switches connected to our core via 1Gps Port-Channels. It's a mix of copper and fiber uplinks. Fiber to the second floor and copper in our datacenter.
The current thinking by our consultant is to configure the management SVI on each of our access switches with their own VLAN uplinked to our 2690 "aggregate" switches. The aggregate switches will in turn be uplinked to the 3750-X stack via a 802.1q trunk and configured with IP Unnumbered to emulate a Layer 3 link bypassing, in essence, L2 communication between the production access switches. The 3750-X stack will have a Loopback configured for each individual VLAN that the production access switches will use as a Default Gateway.
The idea/concern is that we do not want our management network to pass STP traffic through to the other access switches or risk any sort of network convergence between the two separate networks. Kind of a "Poor Man's" Private VLAN setup.
I'm wondering if this is the best or most efficient way to set this up or if there is a better way to go about it.