Say you have two networks for example with multiple subnets separated by the internet with a site to site link such as a VPN or direct link from an ISP, if you assign the same VLAN numbers on a Cisco device at each site for example could that create any conflicts?
say SiteA has multiple subnets in the range of 10.10.16.1 /21, using L3 switching (then connected to a router for outbound/internet) each subnet is on it's own VLAN so,
10.10.16.0/24 is on VLAN 16
10.10.17.0/24 is on VLAN 17
SiteB also has multiple subnets in the range of 10.11.16.1/21, also using L3 switching then connected to a router
10.11.16.0/24 is on VLAN 16
10.11.17.0/24 is on VLAN 17
would there be any issues with the VLAN assignments? would there be communication (assuming no ACLs assigned and no firewall rules) between say VLAN 16? would the 10.11.16.0/24 subnet be able to ping the 10.10.16.0/24 subnet successfully (assuming NAT was configured)?
question would be does the VLAN specific tagging stop at each router?