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Cisco 870 Inter VLAN Traffic

juanmc
Level 1
Level 1

Hello,

I have configured a Cisco 870 Series (I know is quite old) with two vlans. Interfaces Fe0,Fe1,Fe2 are in default VLAN1 and interface Fe3 is in VLAN2

And here comes the problem. When I restart the router, the switch passes traffic between both vlans up to the moment it starts to load the ios.

From a security standpoint that's a problem, since something that should be isolated it is not, even although it's for a few moments. And it's causing me some problems, since I have a dhcp server in vlan1 and computers connected to VLAN2 have been able to contact dhcp server and get an address from VLAN1

¿Is this a known bug?

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