802.1Q tunnels

Hi,

I was just reading this:

http://ham.kiev.ua/3550/en/US/products/hw/switches/ps646/products_configuration_guide_chapter09186a0080115937.html#xtocid6

I understand that when configuring dot1q tunneling, we are supposed to increase the system mtu by four bytes. I was wondering it we must do this on ALL the switches in the topology that are communicating with each other, or only on the switches that have dot1q tunnels configured on their interfaces. In other words, if the system mtu is increased on one switch, is it necessary to increase it on all of them?


Thanks!

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