This `no` form of this command disables the service MTU checks.
When the check is disabled the system will pass on packets to the
egress as long as the packet length is lesser than or equal to the
configured port MTU. In other words, the length of the packet sent
out of a SAP is limited by the access port MTU and the length of
the packet sent out of a PW is limited by the network port MTU
(minus the MPLS encapsulation). When set to 'false', the configured
svcMtu value is not enforced