B1izzard
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Will unmanaged switch drop VLAN frames?
I've read differing opinions on this, so I would like to hear from others.
If I have a Cisco managed switch, and it is plugged into a Netgear unmanaged switch, does the Netgear strip all information permanently from the ethernet frame that it received from the Cisco before sending it on it's way, or does it just drop the frame altogether?
If I have a Cisco managed switch, and it is plugged into a Netgear unmanaged switch, does the Netgear strip all information permanently from the ethernet frame that it received from the Cisco before sending it on it's way, or does it just drop the frame altogether?
If unmanaged switch is capable of transmitting frames of 1514 size, then vlans will flow through that switch.
however, I would not recommend using unmanaged switches with vlans.
however, I would not recommend using unmanaged switches with vlans.
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Had to do a little research to find out how how you got the 1470 and 1496 numbers, but now I understand why this can be a little more complicated than a simple yes or no answer. Since you probably all know this, I will post it for others. Please correct if any of this is wrong, as I pulled it off the internet.
Ethernet has a maximum frame size of 1500 bytes, so most devices use 1500 as their default MTU. An Ethernet packet larger than 1500 bytes is called a Jumbo Frame. 802.1q max frame size is 1522.
ISL max frame is 1548 bytes
Ethernet has a maximum frame size of 1500 bytes, so most devices use 1500 as their default MTU. An Ethernet packet larger than 1500 bytes is called a Jumbo Frame. 802.1q max frame size is 1522.
ISL max frame is 1548 bytes
Close, but not quite. :-)
Ethernet has a maximum FRAME size of 1518 bytes. The PACKET inside of the frame is limited to 1500 bytes to avoid exceeding the max ethernet frame size. A packet is encapsulated in a frame that has a 6 byte destination address, 6 byte source address, 2 byte type and 4 byte frame check sequence added.
So other than interchanging "Frame" and "Packet", it sounds like you've got it.
Ethernet has a maximum FRAME size of 1518 bytes. The PACKET inside of the frame is limited to 1500 bytes to avoid exceeding the max ethernet frame size. A packet is encapsulated in a frame that has a 6 byte destination address, 6 byte source address, 2 byte type and 4 byte frame check sequence added.
So other than interchanging "Frame" and "Packet", it sounds like you've got it.
ASKER
So basically the unmanaged switch will drop it if the VLAN packet size is greater than what it can handle, and this varies by manufacturer. Thanks for clearing that up.
Some new smart switches can do an additional vlan but it's still one Vlan per port and all else are dropped.