I am in the middle of a a big project and i am stack and need your help. i have been ask to come with the best way to configure and back up 3 cisco 3750g 48 ps switch. let me add more details, i have two cabinets:
1. Main cabinet there need to be 2 Cisco 3750 that configure as one.
2. Second cabinet there is only one Cisco 3750. and it is located 20 maters from the main C.
my boos want me to Find the best way to back up all the switches in case of a crash.
i need to Specify that the servers that will be install in the main cabinet wont be in the second one. because the second one is the DR.
My solution is:
1. In the main cabinet add a third switch and configure the 3 switches in stack mode.
2. In the second cabinet add one more switch and configure them at stuck mode.
The benefit of using a stack of 3750 is that they "SHARE" the configuration among themselves. If one fails, the others carry on their work and configuration. Logically, a stack of 3750 is one big logical switch. That is true HA.
My recommendation is to move your 3750 together and stack them. Re-run the fibre and/or copper back to the new stack. This is the best way. You don't need to bother about HSRP, STP, etc.
One of the benefits of doing this is when you dual home a server. When you dual home a server to two separate logical switches, it's basically impossible. However, if you dual home a server to a single logical switch, then it's as easy as configuring "NIC teaming" on the server side and enabling etherchannel on the stack 3750 side.