Segmenting only with VLAN (no subnetting) on an LACP network
Posted on 2013-09-18
I was having a discussion with one of our network engineers regarding the possibility to save time and IP addresses when segmenting to different networks, by only using VLANs instead of subnetting + using VLANs.
his method: subnet to create a new network, assign a VLAN to that network on the switchport and all machines interfaces (VMs)
my thoughts: do not subnet, just assign the VLANs to the switchport and the machines
Since our assigned addresses are real world routable IP addresses, my suggestion could save a lot of IPs, if for example you need to set up a new network for 5 machines, you automatically subnet to an 8 ip network and lose 3 ips. and even if not, then you will still always leave room for upscaling and lose IP addresses.
Also, without subnetting, it's less effort and time.
Now, I do know from googling that my method can work, and you don't HAVE TO subnet + VLAN to segregate your network.
However, what he claims is that they cannot do that, because of a protocol restriction - running Link Aggregation Control Protocol does not allow this kind of configuration.
I tried to put the pieces together as to how and why the use of LACP would prevent such configuration, but I'm clueless.