Hitachi GR2000 - Manual (Page 256)

This router supports IEEE802.1Q (Tag-VLAN), but it does not support IEEE802.1p
(priority control).
4.5 WAN Networking Restrictions
4.5.1 Required Settings on GR2000 for Connecting Other Devices on PPP
Connecting GR2000 to certain devices on PPP sometimes require specific setting of
configuration definition options on GR2000 as shown in Table 4-77. For the
configuration definition operation, see Subsection 3.7.1 in Configuration Guide.
Table 4-77 PPP Configuration Definition Settings Required with Specific Devices
Target Device Required Setting on GR2000 Required Setting on Target Device
NP220 None (default) None (default)
NP200 None (default) NP200 Ver04-02 or below: Set LQR Nego
parameter (quality monitor protocol or
PPP property) to No.