QoS and QoS Policies
50
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
• When a SAP is created using a LAG, whether the LAG has any port members
and whether the egress scheduler mode is 4-priority or 16-priority, the default
shaper group is automatically assigned to the SAP.
• Shaper groups cannot be changed from the default if they are assigned to SAPs
that use LAGs with no port members.
• The last LAG port member cannot be deleted from a LAG that is used by any
SAP that is assigned a non-default shaper group.
• The shaper policy or shaper group is not checked when the first port is added as
a member of a LAG. When a second port is added as a member of a LAG, it can
only be added if the shaper policy on the second port is the same as the shaper
policy on the first member port of the LAG.
• The shaper group of a LAG SAP can be changed to a non-default shaper group
only if the new shaper group exists in the shaper policy used by the active LAG
port member.
• A shaper group cannot be deleted if it is assigned to unshaped SAPs
(unshaped-sap-shaper-group command) or if it is used by at least one LAG
SAP or non-LAG SAP.
• The shaper policy assigned to a port cannot be changed unless all of the SAPs
on that port are assigned to the default shaper group.
In the ingress direction, there can be two different shaper policies on two different
adapter cards for the two port members in a LAG. When assigning a shaper group
to an ingress LAG SAP, each shaper policy assigned to the LAG port MDAs must
contain that shaper group or the shaper group cannot be assigned. In addition, after
a LAG activity switch occurs, the CIR/PIR configuration from the subgroup of the
policy of the adapter card of the newly active member will be used.
The following ingress MSS restrictions allow the configuration of shaper groups for
LAG SAPs, but the router ignores shaper groups that do not meet the restrictions.
• When a SAP is created using a LAG, whether the LAG has any port members
and whether the ingress scheduler mode is 4-priority or 16-priority, the default
shaper group is automatically assigned to the SAP.
• Shaper groups cannot be changed from the default if they are assigned to SAPs
that use LAGs with no port members.
• The last LAG port member cannot be deleted from a LAG that is used by any
SAP that is assigned a non-default shaper group.
• The shaper policy or shaper group is not checked when the first port is added as
a member of a LAG. When a second port is added as a member of a LAG, all
SAPs using the LAG are checked to ensure that any non-default shaper groups
already configured on the SAPs are part of the shaper policy assigned to the
adapter card of the second port. If the check fails, the port member is rejected.
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