I'm looking for best practice, that would optimize the network design.
currently, all Distrubution switches are connected to Core switches (dual core design) by trunks.
We are going to more these trunks to routed ports. There are two ways of doing it.
1-use /30 subnets to create interfaces on both Distrubution and core switch. this will involve the core switch in routing decisions.
2-use single subnet to connect various Distrubution switches to each other (for redudency two subnet can be used). this will make the core switch act as a switch only and will not involve in routing decision.
I was wondering which practice would be best.
just last question.
How do they use /31. Since it will give only two IP addresses. one is network, second is broadcast. Cisco router/switch will warn that /31 should be used only on point to point links.
I would like to use /31 since it will have lesser number of ips wasted on broadcast or network. but again, how does it work.
Cisco supports /31 on point to point links and they simply treat both available addresses as host addresses -
If you are using private addressing internally i could never reallly see the point myself as you can always allocate some more private addressing. It's more useful for conserving public addressing.