Management VLAN & multiple subnets

A client has three subnets, three routers and four switches:

Site A
ISR 1841
2 x WS-C2950-24T

SIte B
ISR 2811

Site C
ISR 1841

Each switch and router are on their own subnet, so when we setup the management VLAN for these sites, do we place all of the switches on VLAN1 or do we place each switch on their own managment VLAN? E.g. on VLAN1, on VLAN2, on VLAN3?

My line of thinking is that because each router and switch is on their own subnet that each management VLAN would have to be assigned a distinct VLAN? Yes? No? Try again?
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if the only links between sites are routed via mentioned ISRs, then all sites should be identical for smoother configuration
for example:
site1, network, mgm vlan1, user vlan 10, voice vlan 20
site2, network, mgm vlan1, user vlan 10, voice vlan 20
site3, network, mgm vlan1, user vlan 10, voice vlan 20

so the only difference is in IPs. All switches within each site should be within the same vlan (unless you have different levels of access, etc)

However, it's just my experience working for ISP and a leading network engineer.

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keatsconAuthor Commented:
The three sites are connected together via MPLS, Sites A & B using HWIC-4ESW's for the MPLS
and Site C using FE0/1.

Site A
  ISR 1841

Site B
  ISR 2811

Site C
  ISR 1841
I agree with from_exp. Use the same vlan numbers at each site and you'll have easier administration. The sites are separated from each other at Layer 3, so the switches could care less what vlans are at the non-local sites.
as all are diffrent site you just  need to define  router in router for all vlan subnet that all.
keatsconAuthor Commented:
devangshroff: You mean enable vlan trunking on the routers, yes?
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