Would VRRP work with OSPF and MPLS?
The quest to this questions is to be able to have 2 routers at one site, in a failover mode if one router fails, the other would work including all parameters like OSPF, MPLS and VPLS
I don’t see why you need VRRP in this case? OSPF will reroute traffic if one router fails.
If you need first-hop redundancy then VRRP works fine. Whatever forwarding protocols you run inside has nothing to do with VRRP, as VRRP is only redundant at the first hop (ie. default gateway).
So how would the implementation of 2 routers on the same site would be done?
OSPF between them? how about VPLS termination on this routers into the same switch, how to avoid the loops there?
You won’t be able to remove the single point of failure without a backup connection. With two WAN lines, here’s how I’d do it:
Two routers, one WAN link on each. If one of the WAN lines are considered backup, bump up the ospf interface cost of that one.
Assuming a LAN of 192.168.1.0/24, give router1 192.168.1.2/24 and router2 192.168.1.3/24, define a vrrp interface on both, like:
/interface vrrp add interface=ether1 name=ether1.vip authentication=simple password=foobar arp=enabled preemption-mode=yes priority=5 vrid=1
/ip address add interface=ether1.vip address=192.168.1.1/32 disabled=no
Do exactly the same on the other router, but change the priority.
Connect both interfaces to the LAN, and make sure your default gateway on your clients is 192.168.1.1.
Voila, redundant routers and redundant WAN. This assumes that a default route is given via OSPF on both WAN links.
If you have only one WAN link, attach your WAN line to a switch and attach both routers to that switch. Buy a quality switch, or your clients will kill you if (when!) it crashes.