we have 2*Cisco 3845 router, running as HSRP, and the two routers will be CE router, i am not sure how many PE routers the SP has, may have 1 PE, so basicly, for HSRP virtual IP will be face to the PE, for this setting, is there anything need to pay attention?
There is one thing, which is not completely clear for me now. Will the HSRP really be used towards the PE, or is it used towards the LAN interface towards your local network?
In case you use HSRP towards the PE - which requires LAN connectivity between CE and PE - the SP will have to use a static route pointing to the virtual IP routing the networks behind the CE routers. There is no problem with that, the SP should know how to achieve this.
The second issue is the routing entry in your CE routers. The way you described the setup I would assume a static default route pointing to the PE IP address should work.
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