HP-UX VLAN Administrator's Guide, February 2007
For IP traffic, 802.1p priority and ToS values in the HP-UX VLAN tag are determined as follows:
• The 802.1p priority value in the HP-UX VLAN tag of the outbound IP packet is determined
as described in Table 1-3.
• The ToS value of an inbound IP packet header is determined as described in Table 1-4.
Table 1-3 HP-UX VLAN Priority Override Setting and Outbound IP Packet Priority Setting
Outbound IP Packet Priority SettingHP-UX VLAN Priority Override Setting
VLAN tag priority setting is the user specified priority.CONF_PRI (default)
VLAN tag priority setting is the IP header ToS converted to
802.1p priority. (see Table 1-2 (page 22)). The ToS value is
taken from the IP header.
IP_HEADER
VLAN tag priority setting is the user-specified ToS converted
to 802.1p priority (see Table 1-2 (page 22)).
CONF_TOS
Table 1-4 HP-UX VLAN ToS Override Setting and Inbound IP Packet Header ToS Setting
Inbound IP Packet Header ToS SettingHP-UX VLAN ToS Override Setting
IP header ToS value is used as-is in the header (it is left
unchanged).
IP_HEADER (default)
IP header ToS value is overwritten with the user specified
ToS.
CONF_TOS
IP header ToS value is overwritten with a conversion of the
802.1p priority value to ToS (see Table 1-2 (page 22)). The
802.1p value used comes from the VLAN tag of the Ethernet
header of the inbound frame.
ETHER_HEADER
IP header ToS value is overwritten with a conversion of the
802.1p priority value to ToS (see Table 1-2 (page 22)). The
802.1p value used is the user-specified priority.
CONF_PRI
NOTE: Non-IP packets are not affected by priority override, ToS override, or ToS settings.
Outbound non-IP packets are always tagged with VLAN ID = user_specified_VLAN_ID and
802.1p priority = user_specified_priority.
Features and Benefits of HP-UX VLANs
The key features of HP-UX VLANs and the benefits realized with using them include the
following:
Features
• HP-UX VLANs are implemented with host-based IEEE 802.1Q/p-compliant tagging to enable
configuring multiple VLANs on a given Ethernet LAN card based on their IP-subnet, protocol,
or LAN card port.
• HP-UX VLANs are for use over fast Ethernet (100 Base-T), gigabit Ethernet, or 10-gigabit
Ethernet LAN cards that run on HP-UX 11i Version 3 servers. HP-UX supports up to 1024
VLANs for the entire system.
• You can use HP-UX VLANs over APA aggregates and LAN Monitor failover groups. This
combines the traffic isolation benefits of VLAN technology with the high-availability and
high-bandwidth capabilities of APA and LAN Monitor technology on HP-UX servers. For
more information about VLANs over APA aggregates and LAN Monitor failover groups,
see the HP Auto Port Aggregation Administrator's Guide (HP-UX 11i Version 3), at:
http://www.docs.hp.com
Features and Benefits of HP-UX VLANs 23