SPX Port and LAG Configuration Rules
Unlike a stacking unit that has two factory default ports, PE units do not have predetermined default ports. However, a PE cannot join a CB without an SPX port or LAG running LLDP. SPX ports and LAGs are either configured by the user as part of a reserve configuration stored on the CB, or the system learns the port and LAG configuration from the PE unit when the PE joins the Campus Fabric domain.
The following rules apply if the reserve PE configuration on the CB differs from the PE configuration learned from the PE unit:
- If the reserve configuration contains no SPX port or LAG, the CB learns the SPX port and LAG configuration from the PE unit.
- If the reserve configuration on the CB contains SPX ports or LAGs, the CB pushes its
SPX port and LAG configuration to the PE unit, after first checking that the PE unit
will still be reachable once the configuration changes.
Note: PE units further downstream are not guaranteed to remain reachable after the reserve configuration is pushed to the PE unit.
When the
spx pe-enable command is entered locally on an ICX 7150, ICX 7250, or ICX 7450, the system generates
two SPX ports as part of configuring the device as a provisional PE unit. The system
applies the following rules to generate the SPX ports, based on the modules installed
in the unit. The first rule has priority over the second rule.
- If an ICX 7450 has any 4 X 10-Gbps ports, the system generates SPX port 1/x/1 and SPX port 1/x/3, where "x" is the slot number of the 4 X 10-Gbps module. If there are multiple 4 X 10-Gbps modules, the SPX ports are configured in the slot with the lowest number.
- If an ICX 7450 has any 40-Gbps modules, the system designates up to two 40-Gbps ports as SPX ports.
- If no 4 X 10-Gbps or 40-Gbps modules are present in the ICX 7450, the system does not generate any SPX ports for the unit.
The user can change the system-generated SPX ports locally while the PE is in Provisional-PE mode.