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Understanding Chassis Cluster Fabric Links

The data link is referred to as the fabric interface. It is used by the cluster's Packet Forwarding Engines to transmit transit traffic and to synchronize the data plane software’s dynamic runtime state. When the system creates the fabric interface, the software assigns it an internally derived IP address to be used for packet transmission.

The fabric is a physical connection between two nodes of a cluster and is formed by connecting a pair of Ethernet interfaces back-to-back (one from each node).

Unlike for the control link, whose interfaces are determined by the system, you specify the physical interfaces to be used for the fabric data link in the configuration.

For SRX Series chassis clusters, the fabric link can be any pair of Ethernet interfaces spanning the cluster; the fabric link can be any pair of Gigabit Ethernet interface.

Note: For SRX Series chassis clusters made up of SRX100, SRX210, SRX220, SRX240, SRX550, or SRX650 devices, SFP interfaces on Mini-PIMs cannot be used as the fabric link.

Table 1 shows the fabric interface types that are supported for SRX Series devices.

Table 1: Supported Fabric Interface Types for SRX Series Devices

SRX5000 line

SRX3000 line

SRX1400

SRX650 and SRX550

SRX240

SRX220

SRX210

SRX100

Fast Ethernet

Fast Ethernet

Fast Ethernet

Fast Ethernet

 

Fast Ethernet

Fast Ethernet

Gigabit Ethernet

Gigabit Ethernet

Gigabit Ethernet

Gigabit Ethernet

Gigabit Ethernet

Gigabit Ethernet

Gigabit Ethernet

 

10-Gigabit Ethernet

10-Gigabit Ethernet

10-Gigabit Ethernet

     

40-Gigabit Ethernet

       

100-Gigabit Ethernet

Note: Starting in Junos OS Release 12.1X46-D10, this interface is supported.

       

Note: The SRX5K-MPC is a Modular Port Concentrator (MPC) that is supported on the SRX5600 and SRX5800. This interface card accepts Modular Interface Cards (MICs), which add Ethernet ports to your services gateway to provide the physical connections to various network media types. The MPCs and MICs support fabric links for chassis clusters. The SRX5K-MPC provides 10-Gigabit Ethernet (with 10x10GE MIC), 40-Gigabit Ethernet, and 100-Gigabit Ethernet ports as fabric ports. For SRX5400 devices, only NG-IOC cards are supported.

For details about port and interface usage for management, control, and fabric links, see SRX Series Chassis Cluster Slot Numbering and Port/Interface Naming .

The fabric data link does not support fragmentation. To accommodate this state, jumbo frame support is enabled by default on the link with an MTU size of 8940 bytes. To ensure that traffic that transits the data link does not exceed this size, we recommend that no other interfaces exceed the fabric data link's MTU size.

 

Related Documentation

 

Published: 2015-02-27

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