26051980DAO wrote:
Hello!
Got a branch office sited in two buildings. 120 users in one, 70 in another.
I'm going to use this design:
1)Edge+distribution - ISR 3495 (is 3845 end-of-sale?) + 2 EtherSwitch services modules (NME-16-ES-1G-P)
2)Access - 3750E-48PD in stack.
!!! All links at all layers should be >=1000 Mbit/s.
Is this design balanced in terms of cost/efficiency(i mean by this redundancy and routing/switching performance)
Any ideas?
Tnx.
As with all design it's important to know what the requirements are. As Paolo says, do you need PoE, and to that could be added a number of other things ie. how resilient/redundant do you need each site to be, does each site have it's own servers or is there a DC or HQ central site somewhere that houses most of them. This is very important because as Leo points out having an ISR with an integrated module could mean a failure of the ISR router could take down the entire branch site. Now if all servers are accessed over the WAN then this is not such an issue but if you have servers locally that allow your users to continue working then would you want your ISR failing to take out the LAN as well ? Obviously not, in which case it might be a better idea to have separate switches at the distribution layer.
If servers are local then another aspect is how important is the branch site in the work of the company ie. if they lose access to their servers how much of an impact does this have on the core business. If high then you would definitely want 3750 stacked or 4500 switches with dual sups/power supplies in the access-layer.
So without knowing traffic patterns and applications it's difficult to say whether it a balanced design.
Jon
