58Appendix A IfIndexes and Interface Identification
Hard-Coded IfIndexes
The following IfIndex numbers are
IfIndex | Description |
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1 | Logical Ethernet interface for routed LAN traffic |
2 | Virtual port for WAN traffic |
3 | Logical Ethernet interface for bridged LAN traffic |
4 | Virtual port for network management traffic |
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Reserved IfIndexes and Ranges
The Passport 4460 also reserves IfIndexes for available ports on the base module and expansion data modules. By reserving these IfIndexes, the Passport 4460 guarantees that a specific port always uses the same IfIndex. For instance, Port 1 always uses IfIndex 150 to refer to the physical interface.
The following table lists IfIndexes that are reserved for use by the ports located on the base module.
Port Number | IfIndex - Physical Port | IfIndex - Connector IfIndex - Service | |
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1 | 150 | 151 | 152 |
2 | 153 | 154 | 155 |
3 | 156 | 157 | 158 |
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There are three reserved IfIndexes associated with each port. For Port 1, IfIndex 150 refers to the physical port interface, 151 refers to the connector interface, and 152 refers to the frame relay service.
