What the best practice for assing addresses between L3 devices connected all together like a star in a L3 switch. I noticed from some examples they use ip addressess with 32 subnet mask but i dont understand why. Is there any problem if i use ips from a network 24mask for example ?
If so, and they are being used for management purposes, a /32 mask is known as a "host mask", and can be carried in a routing protocol like OSPF. Doing this provides more device IP addresses since you don't have to set aside some of the network address space for a network address or broadcast address. For example, a /30 uses a block of 4 IP addresses vs. /32 only using 1 IP address.
im sorry u have right... im trying to understand why some configuration examples use the /32 bit sm for connection between routers. Is this different from using a subneted network or is more practical ?
For serial interfaces, you normally use /30 addresses with each device interface (on the two ends of the link) using the "middle" two addresses of the /30.
As Giuseppe describes, it's possible to define interfaces that borrow another interface's IP address, but with private IP addresses, there's often enough address space this isn't required.
If two routers are connected by Ethernet, you can also use /30, but if the Ethernet will be shared by other hosts, then increase the address space as needed. If you're working with 10.x.x.x private addresses, you might just use a /24 even if you only start with a low number of hosts.
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