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A POS port configured for IPCP and/or IPXCP encapsulation must be the sole member of the VLAN. You cannot add any other port to a VLAN which already has a POS port with IPCP and/or IPXCP encapsulation enabled. You cannot add a POS port which is configured for IPCP and/or IPXCP encapsulation to a VLAN which already has other ports as members.
Note also that for the IP address assigned to the POS port, 30-bit subnet masks may be required for certain JUNOS releases.
Note:
When the 8600 switch is interoperating with a Juniper router, the POS port must have the Juniper IP address configured in the remote IP field. This is necessary because the Juniper routers do not provide their local IP address during PPP negotiation. The 8600 switch requires the Juniper address for IPCP operations.