Alcatel Carrier Internetworking Solutions Omni Switch/Router - Manual (Page 488)

Configuring Source Routing
Page 17-40
Configuring Source Routing
The srs and src commands allow you to display and configure the source routing parameters
for the selected group.
SAP Filtering
The Service Advertising Protocol (SAP) filter is a method for allowing the user to decide what
type of source routed packets are allowed to be transmitted out of the switch. When the
filters are configured, they examine the DSAP (destination) and SSAP (source) fields in an
outgoing packet, compare them to the filter values to see if they match, and then either
allows or blocks packet transmission.
There are two types of filters that can be configured: a “permit” filter and a “deny” filter. If a
packet matches the value in a deny filter, and the value is not 0, then the packet is discarded.
If a permit filter is configured, and a packet does not match the filter value, then the packet is
discarded. Only two of each type of filter can be configured.
To use this feature, it must first be enabled, then configured. Once a filter is enabled and
configured, it can be viewed as part of the source routing statistics. These procedures are
covered in the following sections:
• For information on enabling the SAP filter see Enabling SAP Filtering on page 17-40.
• For information on configuring SAP filters, see Configuring SAP Filtering on page 17-41.
• For information on viewing SAP filters, see Viewing SAP Filtering on page 17-42.
Enabling SAP Filtering
To use the srsf command to enable SAP filtering, follow the steps below:
1. Enter the srsf command at the system prompt.
2. The following message is displayed:
SAP Filter support is OFF, set it to ON? (n) :
Enter y and press <return> .
3. Another message is displayed confirming the activation of the SAP filtering feature:
SAP Filter Support is now “ON”