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multiple networks on default vlan on sg5000

can a sg500 switch handle multiple ip spaces on the default vlan?

 

I have a customer with 3different networks all running on default vlan  they DG's are 192.168.1.1 10.10.10.1 and 192.168.99.1 (on srp521) 192.168.100.1 vlan100 for voice.  DHCP is only enabled on 1 router the srp521, both on vlan 1 and on 100.  On my cisco spa50x ip phones I am constantly getting DHCP timeout for the reboot reason of the phone.  I am also seeing the phones un-register but I do not see the registration failures on my voip switch.  

 

 I have multiple customers using sg500,srp521 and spa50x phones with no issues, however they all only have one network router.  Is there anything wrong with having multiple ip spaces running on the same vlan?

 

Thanks

Sage

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