Monitoring and Managenent in IPVPN's

Hi,
Could do with a bit of advice on monitoring and management of circuits and CPE's in L3IPVPNs
Graphing of circuits seems straight forward as I can just add PE's to Cacti and graph all customer circuits.
My thoughts when looking at Monitoring CPE is that I could use Central Services where I have a monitoring VRF with a NMS server sat on it, this monitoring vrf would import all the CPE loopbacks from all customer IPVPN's and then all customer IPVPN's would import the ip address of the NMS server, is this common?
The only issue or complexity I can see in this is the management of IP addressing as I would have to make sure all CPE's loopbacks across all IPVPN's have unique IP addresses that do not conflict with the customer IP addressing scheme and do not conflict with the monitoriong IP addressing scheme.  This is because the monitoring VRF will hold the all CPE loopbacks routes and the monitoring subnet and then the customer overlap is a consideration as the CPE will be configured with that /32 and therefore it can't overlap with their IP addressing.
Any way to simplify this or work around this?
To make this easier is anyone utilising the 169.254.0.0/16 subnet for Central Services as we have a better chance of the customers not wanting to use this, can anyone see a potential issues using this?
For management I could just stick another server (maybe a terminal server or just use the NMS server) on the same monitoring subnet and again use the CPE loopbacks to ssh to them, although I worked at a previous (much larger ISP) and we had some sort of system that you could ssh to and choose what IPVPN/vrf you want to be in and then you were in that vrf - it was a long time ago that I worked there and didn't put much thought into how that worked at the time (wish I had now) but the only way I can see this working is something that could run MPBGP - all I am asking here is whether anyone has any suggestions/links/software or nice tricks of the trade  etc for managemnet- I know it is a high level question and I don't expect anyone to spend a load of time walking me thorugh this.
Any input on this would help a lot, thanks in advance
BTW, my PE's are ASR 9001's

Hi,
Could do with a bit of advice on monitoring and management of circuits and CPE's in L3IPVPNs
Graphing of circuits seems straight forward as I can just add PE's to Cacti and graph all customer circuits.
My thoughts when looking at Monitoring CPE is that I could use Central Services where I have a monitoring VRF with a NMS server sat on it, this monitoring vrf would import all the CPE loopbacks from all customer IPVPN's and then all customer IPVPN's would import the ip address of the NMS server, is this common?
The only issue or complexity I can see in this is the management of IP addressing as I would have to make sure all CPE's loopbacks across all IPVPN's have unique IP addresses that do not conflict with the customer IP addressing scheme and do not conflict with the monitoriong IP addressing scheme.  This is because the monitoring VRF will hold the all CPE loopbacks routes and the monitoring subnet and then the customer overlap is a consideration as the CPE will be configured with that /32 and therefore it can't overlap with their IP addressing.
Any way to simplify this or work around this?
To make this easier is anyone utilising the 169.254.0.0/16 subnet for Central Services as we have a better chance of the customers not wanting to use this, can anyone see a potential issues using this?
For management I could just stick another server (maybe a terminal server or just use the NMS server) on the same monitoring subnet and again use the CPE loopbacks to ssh to them, although I worked at a previous (much larger ISP) and we had some sort of system that you could ssh to and choose what IPVPN/vrf you want to be in and then you were in that vrf - it was a long time ago that I worked there and didn't put much thought into how that worked at the time (wish I had now) but the only way I can see this working is something that could run MPBGP - all I am asking here is whether anyone has any suggestions/links/software or nice tricks of the trade  etc for managemnet- I know it is a high level question and I don't expect anyone to spend a load of time walking me thorugh this.
Any input on this would help a lot, thanks in advance
BTW, my PE's are ASR 9001's

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