We need to connect around 60 to 70 locations to a central location by WAN. Each location need at lease T1 link.
With this situation if we fo for point to point links we will need STM at (central location) where we can terminate 64 T1 or E1 links. Do we have any other interface cards that can be installed in mid range router to support termination of these many E1 or T1. ( 3800 or new 3900 series ). Or else we may have to select 7600 series to install STM module. That may go well above budget !!
Benefit of point-to-point link is total flexibility we can have our own routing protocol, QoS
2. If we go for MPLS links what we need a around 50 mbps at central location ( theoritically ) that will be given by service provider by fastethernet. We can terminate it on HWIC or fast ethernet card. And we dont need STM module or higher end router.
Disadvantages is that we may not get flexibility for QoS or we may need to additional service from service provider for Voice,video or ERP applications.
Advantage is we dont need to worry about any routing protocol, as a default route to service provider is what needed on all routers. Unless we configure own GRE tunnels and configure IPSEC.
Configuring GRE or IPSEC will be configured also on point to point links so it's acomman factor.
Apart from this, proposal from service provider regarding budget will definitely play important role in decision.
What infrastructure we need at our end will be important as well : STM with 7600 series with pt-to-pt links or mid-range 3845- HWIC with MPLS
At branch location any 1800 or 3825 with T1 / WIC-2T/HWIC connectivity is same in both cases.
Please share the experience with pros and cons