depending on what you want to achieve, the config looks ok. Just be aware that there are a couple of caveats regarding secondary addressing such as that OSPF won't form adjacencies with secondary addresses.
If you just want to achieve extended connectivity for more than one subnet, the config is ok.
your configuration is okay... but first of all check it out your requirement for the configuring the secondary ip address to the interface... because in some cases secondary IP addresses are not usefull ...condition like...
if any, with secondary addresses occur mainly in conjunction with routing protocols, such as OSPF, which cannot establish adjacencies on secondary addresses. Other than that, you can add as many as the software allows you to. I guess the reason why multiple secondary addresses are being used, rather than multiple logical interfaces, is that you do not have to bother with trunking, inter-VLAN routing etc. when using secondary addressing. It is just a simple way of being able to add more hosts. I would be careful, though, to not add to many hosts, since that, and especially with regard to VoIP, can cause problems with delay and dropped packets, which VoIP usually doesn't handle very well.
so please first of all check out your requirement...
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