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QoS Overview
Note: The default frame type configured is Ethernet - II
Frame Format
802dot2-snap
Ethernet-II
Table 22: MAC Match Criteria Frame Type Dependencies
Frame Format
802.3
802dot2-llc
802dot2-snap
Service Ingress Classification on 7210 SAS-K
On 7210 SAS-K devices, on SAP ingress user has an option to use either Dot1p classification or
IPv4 DSCP classification or IPv4 packet header fields or IPv6 packet header fields or MAC packet
header fields. The Dot1p or DSCP classification rules to be used are defined in the Dot1p and
DSCP classification policy and associated with the SAP ingress policy. The DSCP and Dot1p
classification policies can be configured in the same QoS policy. The IPv4 or IPv6 or MAC criteria
can be configured in the SAP ingress policy.
When packets are received on a SAP, the following steps are used to determine the FC to assign to
the packet.
Step 1: Match IP criteria entries with the IP packet header fields in the packet. Assign the FC
corresponding to the first entry which matches with IP packet header field values in the packet. If
it is not an IP packet or if there is no match, go to next step.
Step 2: Match MAC criteria entries with the MAC packet header fields in the packet. Assign the
FC corresponding to the first entry which matches with MAC packet header field values in the
packet. If there is no match, go to next step.
Step 3: Match the IP DSCP value in the packet with the value configured in each of the IP DSCP
entry defined in the DSCP classification policy. Assign the FC corresponding to the first entry
which matches with IP DSCP value in the packet. If it is not an IP packet or if there is no match, go
to next step.
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7210 SAS D, E, K OS Quality of Service Guide
IEEE 802.2 Ethernet frame with 802.2 SNAP header. Only the source MAC
and destination MAC address are compared for match criteria.
Ethernet type II frame where the 802.3 length field is used as an Ethernet
type (Etype) value. Etype values are two byte values greater than 0x5FF
(1535 decimal).
Source MAC
Dest MAC
Yes
Yes
Yes
Description
IEEE 802.1p Value
Yes
Yes
Yes
Yes
Yes
Yes
Etype Value
No
No
No
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