As Jon says, it is not possible to divide the address space asymetrically because you have to split it on a bit boundary. However, if your objective is to split the space into two VLANs, there is a slightly messy trick you could use: split it three ways (one /25 and two /26) and put two subnet (the /25 and a /26) on one VLAN.
In the following example, VLAN 221 handles the address space from 10.24.22.0 to 10.24.22.63, and VLAN 222 handles the address space from 10.24.22.64 to 10.24.22.255.
int vlan 221
ip address 10.24.22.1 255.255.255.192
int vlan 222
ip address 10.24.22.65 255.255.255.192
ip address 10.24.22.129 255.255.255.128 secondary
Of course, you have to avoid issuing addresses that conflict with any of the base addresses, gateway addresses, or directed broadcast addresses.
For the hosts in VLAN 222, there are two ways you could configure them:
1. You could give them different gateway addresses depending on which subnet they fall into,
2. You could give them all a /24 mask and tell them to use 10.24.22.65 or 10.24.22.129 as gateway - it doesn't matter which. In this case, if they wanted to talk to any hosts in VLAN 221, they would be relying on proxy-arp responses from the switch.
We are pleased to announce availability of Beta software for 16.6.3.
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looking for early feedback from customers befor...
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