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This topic contains 1 reply, has 2 voices, and was last updated by  Paul Rouk 2 years, 6 months ago.

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    I know that multi-layer switches perform both routing and switching and allow someone to set-up Vlans but what if a computer on one Vlan does for some reason need to contact a computer on another Vlan? does the switch route this traffic the same way a router would contact a different network normally?


    Paul Rouk

    It depends on the capabilities of the switch. For a layer 2 switch, a router is required for communication between VLANS. For more advanced switches, they can do the routing internally. Below is a paragraph from Cisco’s web site about how this works.

    “L2 only switches require a L3 routing device (either external to the switch or in another module on the same chassis). A new breed of switches, however, (for example, 3550 and 3750) incorporate routing capability within the switch. The switch receives a packet, determines that it belongs to another VLAN, and sends the packet to the appropriate port on the other VLAN.”

    Source: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/45002-intervlan3750-45002.html#pre

    The link below has an explanation which might be a bit easier to understand.

    InterVLAN Routing Tutorial

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