If you have deleted the subinterface then it no longer shows up in show run. But it will continue to show up in the show ip interface brief since the original creation of the subinterface created an entry in the dynamic data structure used by running config and its associated IDB. That entry will remain in the data structure until you reload the router. So the only reliable way to get the subinterface to not show up in show ip interface brief will be to reload the router.
I'm worried only at the fowarding plane level: when we have 802.1Q subinterface on a router we can distinguish it by its vlan id.
In this case you are using an SVI that is tied to broadcast domain layer2 Vlan5 and you create a subinterface of it: there isn't an easy to read parameter that tells what packets are for VLan5 and what are for vlan5.1.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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