Nortel 5000 Series Release Notes page 48

48 Known issues and limitations
masks and filters and non-QoS masks and filters consumed on each port.
You can determine whether an application that requires filter resources can
be enabled on a port by verifying that the number of available masks and
filters meet the mask and filter requirements of that particular application.
On the Ethernet Routing Switch 5500 Series switches, the available masks
and filters available on a port can be determined by adding the total number
of QoS and non QoS masks in use and the total number QoS and non QoS
filters in use on a port and then subtracting that number from 16 masks
and 128 filters, respectively.
On the Ethernet Routing Switch 5600 Series switches, the output of the
show qos diag allows you to count the unused masks to determine the
number of available masks for a particular port. The 5600 Series switches
share resources across a group of ports. The filters used by QoS or non
QoS applications on a port for a specific mask determine the available filters
for that mask for all ports from that group.
On the Ethernet Routing Switch 5600 Series switches, you can determine
the number of the filters available for a mask from a group of ports by adding
the total number of QoS and Non QoS filters in use and subtracting that
number from 256. If the number of filters in use for a mask is equal to 256,
that mask cannot be used on other ports from the same group.
On the Ethernet Routing Switch 5500 Series switches, to enable IP Source
Guard on a port requires 1 mask and 10 filters. To verify that IP Source
Guard can be enabled on port 5, you can view the show qos diag output
display and determine that port 5 is currently using a total of 4 masks (QoS
plus non-QoS) and 5 filters (QoS plus non-QoS). This means that 12 masks
and 123 filters are available for use, which meets the IP Source Guard
requirement of 1 mask and 10 filters. The following figure shows the show
qos diag display before enabling IP Source Guard on port 5.
Copyright © 2008., Nortel Networks
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Nortel Ethernet Routing Switch 5000 Series
Release Notes — Release 6.0
NN47200-400 04.01 Standard
6.0 12 December 2008