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2.11.2 Priority control function where in ACL is used
This device can control the priority by using ACL. If ACL is used, the allocation of the output port queue is
decided, based on the combinations of the MAC address, packet format, VLAN ID, COS value, IP address, and
the port number etc of the packet which passes through this device and the priority control information like
DSCP can be rewritten.
When the priority is controlled using ACL, ACL that specifies the packet which is a target of priority control is
defined. For this device, "acl mac" definition, "acl vlan" definition, "acl ip" definition, "acl ip6" definition, "acl tcp"
definition, "acl udp" definition, and "acl icmp" definition are set and this enables the priority control. Moreover,
for the input port, the action against ACL number of defined ACL and the packet which is compatible to that ACL
is specified. The action comprises of specifying the output queue and rewriting of the DSCP (differentiated
services code point) field as an action.
When priority control of the packet is to be executed using DSCP, DSCP is specified by the ACL definition and the
algorithm of output queue and priority control for that DSCP are specified. WRR, WDRR, and Strict can be
selected as for the algorithm of the priority control. When the bandwidth which is least secured is to be
allocated for DSCP, WRR or WDRR can be selected, and when the frame of the queue with high priority is to be
allocated to the top priority, Strict can be selected.
Refer to the chapter of the DSCP value rewriting function for the function which executes rewriting of the DSCP
field. The DSCP rewriting function of this device complies with RFC2474: Definition of the Differentiated Services
Field (DS Field) in the IPv4 and IPv6 Headers.
Upper limit which can be set in device
The upper limit which can be set in the device is shown below.
• Upper limit by set command:：
- When the CEE function is used, 62 devices
- When the CEE function is not used, 64 devices
Settings is possible up to upper limit by setting command in addition with "macfilter", "vlan macfilter", "lan ip
filter", "qos aclmap", "vlan qos aclmap", "lan ip dscp", "ip6filter", "vlan ip6filter", "lan ip6 filter", "ip6qos
aclmap", "vlan ip6qos aclmap", "lan ip6 dscp" commands.
The priority level is respectively as follows.
- The applicable priority level of command is the order of macfilter"、"vlan macfilter"、 "lan ip
filter"、"qos aclmap"、"vlan qos aclmap"、"lan ip dscp"、"ip6filter"、"vlan ip6filter"、"lan ip6 filter"、
"ip6qos aclmap"、"vlan ip6qos aclmap"、"lan ip6 dscp" commands.
- The priority level between ether ports becomes high though the ether port number is smaller.
- The priority level between VLAN becomes high though the VLAN ID is smaller.
• Upper limit according to number of masks：
- When the CEE function is used, 62 devices
- When the CEE function is not used, 64 devices
Settings is possible up to upper limit by number of masks in addition with "macfilter", "vlan macfilter", "lan ip
filter", "qos aclmap", "vlan qos aclmap", "lan ip dscp", "ip6filter", "vlan ip6filter", "lan ip6 filter", "ip6qos
aclmap", "vlan ip6qos aclmap", "lan ip6 dscp", "vlan protocol" commands.
The priority level is respectively as follows.
- The applicable priority level of command is the order of vlan protocol"、"macfilter"、"vlan
"lan ip filter"、"qos aclmap"、"vlan qos aclmap"、"lan ip dscp"、"ip6filter"、"vlan I
filter"、"ip6qos aclmap"、"vlan ip6qos aclmap"、"lan ip6 dscp" commands.
- The priority level between ether ports becomes high though the ether port number is smaller.
- The priority level between VLAN becomes high though the VLAN ID is smaller.
" The number of masks which "macfilter", "vlan macfilter", "lan ip filter", "qos aclmap", "vlan qos
aclmap", "lan ip dscp", "ip6filter", "vlan ip6filter", "lan ip6 filter", "ip6qos aclmap", "vlan ip6qos
macfilter" 、
p6filter"、"lan ip6
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