Scaling (Supported Topologies)

Scaled Topology Including SPX (PE) Ring and PE Chains

Scalability Limits

  • 4 CB stack units (ICX 7750)

  • 36 PE units (ICX 7450, ICX 7250, and ICX 7150)

  • 6 PE units per chain cascade depth

  • 1500 PE ports

  • 4 VLANs per PE port (including the default VLAN) , 32 RSTP instances or 8 MSTP instances

  • 12 directly connected PEs

  • 8 PE rings

  • 8 PE rings and 12 directly connected PEs running in parallel

  • 32 SPX ports per CB unit (For example, on a 2-unit CB stack, there are 32 SPX ports on the CB active controller and 32 SPX ports on the CB standby controller.)

Attention: Use port extender ports to hook to APs, phones, and PoE devices. Use control bridge ports to connect to servers, VMs, and so on.

Do not hook the PE ports to any other routers and switches. Do not deploy where compact switches are connected to the PE ports where the compact switches are not part of the Campus Fabric, but standalone units.

Disable LLDP on user ports where it is not required for the FastIron system to scale, and avoid high CPU issues.

Turn off FDP and CDP in scaled environments.