
Configuring Traffic Filters and Protocol Prioritization
3-12 117348-A Rev. A
LLC2 Criteria and Actions
You can filter inbound LLC2 traffic based on specified bit patterns in the LLC2
header.
Adding an IBM protocol to a circuit automatically adds LLC2. LLC2 traffic filters
apply to LLC2 routed over Frame Relay (also known as native SNA over Frame
Relay) and to any protocol running over LLC2, including Advanced Peer-to-Peer
Networking (APPN) and LAN Network Manager (LNM).
Predefined LLC2 Criteria
Table 3-8 lists the predefined criteria for LLC2 inbound traffic filters, and the
reference field, offset, and length for each criterion.
User-Defined LLC2 Criteria
In addition to the predefined LLC2 criteria, you can create traffic filters with
user-defined criteria by specifying an offset and length to these reference fields in
the LLC2 header:
LLC2 Actions
The LLC2 filtering actions are Accept, Drop, and Log.
Table 3-8. Predefined Criteria for LLC2 Inbound Traffic Filters
Criterion Name Reference Field Offset Length
Destination MAC Address LLC2_DEST_MAC 0 48
Source MAC Address LLC2_SOURCE_MAC 48 48
DSAP LLC2_DSAP 0 8
SSAP LLC2_SSAP 8 8
Reference Field Description
LLC2_DEST_MAC Points to the first byte of the Destination MAC Address
LLC2_DSAP Points to the first byte of the Destination SAP (DSAP)
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