Specifications

Acting on traffic destined for a particular DHCP client (CR00017018) 165
Version 291-18
C613-10488-00 REV Q
Acting on traffic destined for a particular DHCP client (CR00017018)
This enhancement enables you to act on traffic that is received on an uplink port and is destined for a particular DHCP client. It expands the classifier
functionality so that the switch can use DHCP snooping records to determine which traffic is destined for each client. Once the classifier has identified the
traffic, you can apply a QoS policy or hardware filters to it.
The enhancement applies to AT-8948, x900-48, and AT-9900 series switches.
For example, you can use the new functionality to track how much traffic each user receives via an uplink port. This enables you to track traffic usage at the
uplink port, even if destination IP addresses are dynamically assigned by DHCP and traffic for multiple users is in the same VLAN.
To configure such tracking:
6. Configure DHCP snooping.
7. Create the required classifiers.
For each DHCP client, create a classifier using the following new options:
create classifier=id ipdaddress=dhcpsnooping snoopport=port-number snoopvlan=vlan-id
The dhcpsnooping option for the ipdaddress parameter causes the switch to dynamically create appropriate classifiers when DHCP snooping deems that
an appropriate DHCP lease event has occurred.
The snoopport parameter specifies the switch port that traffic egresses for the target DHCP client.
The snoopvlan parameter specifies the VLAN for traffic to that client.
8. Put the classifiers into a QoS heirarchy.
9. Apply the QoS policy to the uplink port.
10. Use the traffic class counters to see how much traffic is destined for each client.
The new options have also been added to the set classifier command and output of the show classifier command.