
Inbound Traffic Filter Criteria and Actions
117348-A Rev. A 3-5
Source Route Bridging Criteria and Actions
You filter inbound source route bridging (SRB) traffic based on specified bit
patterns in the native SRB frame header. IP-encapsulated SRB traffic filters are
not supported.
SRB filters affect both explorer and routed frames. However, filters that include
Next Ring as a criterion affect only routed frames because the Next Ring
reference field does not appear in explorer frames. See Configuring Bridging
Services for information about explorer and routed frames.
Predefined SRB Criteria
Table 3-3 lists the predefined criteria for SRB inbound traffic filters, and the
reference field, offset, and length for each SRB criterion.
Specifying an SRB Criterion Range
If you create an SRB filter that includes a Source or Destination NetBIOS Name
criterion, you type the NetBIOS name as the ASCII equivalent of the first 15
characters of the name. If the name has fewer than 15 characters, use ASCII
spaces (0x20) to ensure that the name has exactly 15 characters.
Note: The router applies SRB filters after it processes a packet. The router
receives the packet on the incoming interface and updates the routing
information field (RIF). The filters that you configure then act on the updated
RIF.
Table 3-3. Predefined Criteria for SRB Inbound Traffic Filters
Criterion Name Reference Field Offset (bits) Length (bits)
Next Ring NEXT_RING 0 12
Destination MAC Address HEADER_START 0 48
Source MAC Address HEADER_START 48 48
DSAP DATA_LINK 0 8
SSAP DATA_LINK 8 8
Destination NetBIOS Name DATA_LINK 120 120
Source NetBIOS Name DATA_LINK 248 120
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