Managmeent VLAN for multiple sites

We have a dedicated VLAN for our management network here, its on its own subnet  192.168.128.0

Switch Management, UPS management and anything with a management IP all have IPs on the subnet.

Some of these devices are spread around not only our HQ, but remote sites that are connected via 200mbps  microwave network, and soon VPN end points will have devices that I need to manage

My though is that, having VLAN128 presented to remote locations may cause issues with broadcasting across the network un necessarily, over the microwave not a huge issue as the speed is there, but over slow DSL VPN tunnels it may cause issues

Am I right in thinking the above and should each site really have its own management VLAN and subnet assigned, and the vlan 128 remain for the HQ only? or is it that its only for management of devices, spreading that vlan across all sites is OK?

it is worth noting that all current VLANs use our core switch back here at the HQ too as their “router”
wsc-itAsked:
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Don JohnstonInstructorCommented:
Like a lot of things in networking, there's not always a "right" or "wrong".

You're right in that extending the management subnet to other sites does increase the broadcast domain.

Am I right in thinking the above and should each site really have its own management VLAN and subnet assigned, and the vlan 128 remain for the HQ only? or is it that its only for management of devices, spreading that vlan across all sites is OK?
So I guess the answer to your question is: Yes  :-)

Since it sounds like your network already has VLAN's extended to the other sites, then it really won't make that much difference.
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asavenerCommented:
Am I right in thinking the above and should each site really have its own management VLAN and subnet assigned, and the vlan 128 remain for the HQ only?
That is the standard setup, in my experience.

or is it that its only for management of devices, spreading that vlan across all sites is OK?
Depends on your definition of "OK."  Personally, I would avoid that.

it is worth noting that all current VLANs use our core switch back here at the HQ too as their “router”
In this case, bridging all traffic back to the main site instead of routing it, then all of the broadcast traffic on those VLANs is already utilizing bandwidth.  Stretching a VLAN across multiple sites will just exacerbate the problem, though.
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