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EX3300 Virtual Chassis

 

Planning EX3300 Virtual Chassis

Before interconnecting EX3300 switches in a Virtual Chassis configuration, you must consider the following factors:

  • The number of switches in the Virtual Chassis and their location—Starting in Junos OS Release 12.2, you can interconnect a maximum of ten EX3300 switches to form a Virtual Chassis composed exclusively of EX3300 switches. You can connect up to six EX3300 switches in an EX3300 Virtual Chassis in prior Junos OS releases.

  • Mounting—You can mount the switches in a single rack or install them on multiple racks. For information on the size and strength of racks, see Rack Requirements.

  • Cabling requirements for Virtual Chassis—You can interconnect EX3300 switches into a Virtual Chassis through uplink ports configured as Virtual Chassis ports (VCPs). By default, ports 2 and 3 of any uplink module are configured as VCPs.

    For information on uplink module port cabling requirements, see Management Cable Specifications.

  • Power requirements—You must plan the installation site to meet the power requirements of the switches in a Virtual Chassis. See Power Specifications for EX3300 Switches.

Understanding EX3300 Virtual Chassis Hardware Configuration

Virtual Chassis is a feature in Juniper Networks EX3300 Ethernet Switches that allows you to interconnect two or more EX3300 switches, enabling them to operate as a unified, single, high bandwidth switch. Starting in Junos OS Release 12.2, you can interconnect a maximum of ten EX3300 switches by using the uplink ports configured as Virtual Chassis ports (VCPs) to form a Virtual Chassis. You can connect up to six EX3300 switches in an EX3300 Virtual Chassis in prior Junos OS releases. By default, uplink ports 2 and 3 are configured as VCPs.

Note

EX3300 switches do not have dedicated VCPs.

All EX3300 switch models support Virtual Chassis, and you can interconnect different models, which allows you to choose among a range of possible port configurations within the same Virtual Chassis.

The Virtual Chassis configuration includes a master switch and a backup switch, with all other switches in the configuration designated as “linecard” member switches. Virtual Chassis operation is managed through the master switch. Each switch in the Virtual Chassis is assigned a unique member ID that is displayed on the switch LCD.

Virtual Chassis Cabling Configuration Examples for EX3300 Switches

You can install EX3300 switches on a single rack or in multiple racks, or in different wiring closets, and interconnect them to form a Virtual Chassis.

You form an EX3300 Virtual Chassis by connecting uplink port connections as Virtual Chassis ports (VCPs). Ports 2 and 3 are configured as VCPs on all uplink modules by default.

The physical location of the switches in a Virtual Chassis is restricted only by the maximum length supported for cables to connect the VCPs—in this case, the maximum length of the uplink module cables. The maximum cable length for the uplink module cables supported by an EX3300 switch is 6.2 miles (10 km).

The following illustrations show various Virtual Chassis cabling configuration examples.

Note

For increased availability and redundancy, we recommend that you always configure your Virtual Chassis in a ring topology.

Figure 1, Figure 2, and Figure 3 show six EX3300 switches stacked vertically in a rack and interconnected in a ring topology.

Figure 1: EX3300 Switches Mounted on a Single Rack and Connected in a Ring Topology: Option 1
EX3300 Switches
Mounted on a Single Rack and Connected in a Ring Topology: Option
1
Figure 2: EX3300 Switches Mounted on a Single Rack and Connected in a Ring Topology: Option 2
EX3300 Switches
Mounted on a Single Rack and Connected in a Ring Topology: Option
2
Figure 3: EX3300 Switches Mounted on a Single Rack and Connected in a Ring: Option 3
EX3300 Switches
Mounted on a Single Rack and Connected in a Ring: Option 3

Figure 4 and Figure 5 show six EX3300 switches mounted on the top rows of adjacent racks and interconnected in a ring topology.

Figure 4: EX3300 Switches Mounted on Adjacent Racks and Connected in a Ring Topology Using Medium and Long Cables: Option 1
EX3300
Switches Mounted on Adjacent Racks and Connected in a Ring Topology
Using Medium and Long Cables: Option 1
Figure 5: EX3300 Switches Mounted on Adjacent Racks and Connected in a Ring Topology Using Medium and Long Cables: Option 2
EX3300
Switches Mounted on Adjacent Racks and Connected in a Ring Topology
Using Medium and Long Cables: Option 2