system mtu setting for DOiT lab 4

From: Michael Zuo (mzuo@ixiacom.com)
Date: Tue Feb 27 2007 - 23:02:28 ART

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hi group,

i ran into an issue doing DOiT lab 4. this lab requires configuration of
dot1q tunnel on switch ports and the solution mentioned that i should
configure "ip mtu 1500" on the vlan SVI interfaces. however, from the
DocCD section on dot1q tunnel, Cisco is recommending setting system mtu
to 1504 because of the 4 extra bytes used by dot1q tunnel.

anyone knows if the DOiT lab solution has a typo?

also, in a lab test environment, is there any negative effects of
setting global "system mtu" instead of per interface "ip mtu"?

thanks a lot

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