Ethernet packet in L2 switch

Unanswered Question
Aug 2nd, 2007

HostA is connecting in L2 switch. When host A sent out a packet,is the packet broadcast to all hosts of the vlan? If no host of the L2 switch reply, then is it will forwarded to the Gateway?

I have this problem too.
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PatsFan12 Thu, 08/02/2007 - 16:36

Is this a VLAN (native) within a switch or a trunked VLAN going across multiple routers?

eric.huihk Thu, 08/02/2007 - 18:40

What differences between native vlan and trunked vlan?

Anyway, there is a connection for this L2 switch to the Gateway.

mhellman Fri, 08/03/2007 - 09:42

Generally speaking, and making a lot of assumptions about the details...no.

A unicast packet will go directly to either:

1) the MAC address of a host on the same VLAN

2) the MAC address of a router that can get to that host (including a default gateway)

However, if a switch receives a frame with a destination MAC not in its CAM table, it will send the frame out on all ports.

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