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Overview of Installation and Configuration
How do Pri and ToS Override Affect My Inbound and Outbound frames?
Chapter 2 33
How do Pri and ToS Override Affect My
Inbound and Outbound frames?
Consider the following command.
lanadmin -V create vlanid
VID
pri
PRI
tos
TOS
pri_override
PO
tos_override
TO
6
This command will create a VLAN interface on PPA 6, with VID as the
VLAN ID, PRI as the 802.1p priority, TOS as the IPv4 ToS value.
• All frames transmitted via the newly created interface will be VLAN
tagged.
• The VLAN ID field in the tag will be VID without exception.
• Please note that non-IP packets are not affected by PO, TO, and TOS
settings. Outbound non-IP packets are always tagged with VLAN ID
VID and 802.1p priority PRI.
The following information applies only to inbound and outbound IP
traffic.
• The 802.1p priority value in the VLAN tag is determined by the PRI,
PO, and TOS settings as shown in Table 2-4.
• The ToS value of an inbound IP packet header is determined by TOS,
TO, and PRI settings as shown in Table 2-5.
Table 2-4 Allowable Settings for VLAN_PRI_OVERRIDE
Value in vlanconf File
Priority Override Setting Outbound IP Packets
CONF_PRI (default) VLAN Tag priority setting is PRI.
IP_HEADER VLAN Tag priority comes from
ToS to 802.1p mapping table (see
Table 2-3). The ToS value is taken
from the IP header.