connecting two different switched network STP issue

[yazeedak1988]

Dear All,

i have an issue an one of sites(Hotel), we have two separated network(one for Admin and other for guest) and each network have STP configuration setup(MSTP is configured in each Network).

we have a vlan that needed to be connected between two networks, and whenever i try to connect a cable between two cores; one of the two core blocks the port via STP.

i tried to configure Rapid STP but could configure two vlan modes(MSTP and Rapid STP) on same core switch.

can any one help?

[dukenuk96]

i tried to configure Rapid STP but could configure two vlan modes(MSTP and Rapid STP) on same core switch.

maybe could not? well.. stp settings are switch-wide, you can not operate in two modes in parallel, however RSTP and MSTP support fallback to native STP.

You do not need to change STP operating mode on any of your switches.

Show full network diagram and full configs.

Why do you have to separate networks? Why not one, in one MSTP region?

If you want fast solution - set bpdufilter on interfaces facing different networks and everything should work, but keep in mind - there is something wrong in your network design.