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Chassis Cluster Dual Fabric Links

 

Dual fabric links remove single point of failure in a chassis cluster setup. If one fabric link fails and one remains functional, all sessions are maintained between the two nodes and the chassis cluster status is preserved. for more information, see the following topics:

You can connect two fabric links between each device in a cluster, which provides a redundant fabric link between the members of a cluster. Having two fabric links helps to avoid a possible single point of failure.

When you use dual fabric links, the RTOs and probes are sent on one link and the fabric-forwarded and flow-forwarded packets are sent on the other link. If one fabric link fails, the other fabric link handles the RTOs and probes, as well as the data forwarding. The system selects the physical interface with the lowest slot, PIC, or port number on each node for the RTOs and probes.

For all SRX Series devices, you can connect two fabric links between two devices, effectively reducing the chance of a fabric link failure.

In most SRX Series devices in a chassis cluster, you can configure any pair of Gigabit Ethernet interfaces or any pair of 10-Gigabit interfaces to serve as the fabric between nodes.

For dual fabric links, both of the child interface types should be the same type. For example, both should be Gigabit Ethernet interfaces or 10-Gigabit interfaces.

Note

SRX300, SRX320, SRX340, SRX345, and SRX380 devices support Gigabit Ethernet interfaces only.

This example shows how to configure the chassis cluster fabric with dual fabric links with matching slots and ports. The fabric is the back-to-back data connection between the nodes in a cluster. Traffic on one node that needs to be processed on the other node or to exit through an interface on the other node passes over the fabric. Session state information also passes over the fabric.

Requirements

Before you begin, set the chassis cluster ID and chassis cluster node ID. See Example: Setting the Chassis Cluster Node ID and Cluster ID.

Overview

In most SRX Series devices in a chassis cluster, you can configure any pair of Gigabit Ethernet interfaces or any pair of 10-Gigabit interfaces to serve as the fabric between nodes.

You cannot configure filters, policies, or services on the fabric interface. Fragmentation is not supported on the fabric link. The MTU size is 8980 bytes. We recommend that no interface in the cluster exceed this MTU size. Jumbo frame support on the member links is enabled by default.

This example illustrates how to configure the fabric link with dual fabric links with matching slots and ports on each node.

A typical configuration is where the dual fabric links are formed with matching slots/ports on each node. That is, ge-3/0/0 on node 0 and ge-10/0/0 on node 1 match, as do ge-0/0/0 on node 0 and ge-7/0/0 on node 1 (the FPC slot offset is 7).

Only the same type of interfaces can be configured as fabric children, and you must configure an equal number of child links for fab0 and fab1.

Note

If you are connecting each of the fabric links through a switch, you must enable the jumbo frame feature on the corresponding switch ports. If both of the fabric links are connected through the same switch, the RTO-and-probes pair must be in one virtual LAN (VLAN) and the data pair must be in another VLAN. Here, too, the jumbo frame feature must be enabled on the corresponding switch ports.

Configuration

CLI Quick Configuration

To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

Step-by-Step Procedure

To configure the chassis cluster fabric with dual fabric links with matching slots and ports on each node:

  • Specify the fabric interfaces.

Results

From configuration mode, confirm your configuration by entering the show interfaces command. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.

For brevity, this show command output includes only the configuration that is relevant to this example. Any other configuration on the system has been replaced with ellipses (...).

If you are done configuring the device, enter commit from configuration mode.

Verification

Verifying the Chassis Cluster Fabric

Purpose

Verify the chassis cluster fabric.

Action

From operational mode, enter the show interfaces terse | match fab command.

user@host> show interfaces terse | match fab

This example shows how to configure the chassis cluster fabric with dual fabric links with different slots and ports. The fabric is the back-to-back data connection between the nodes in a cluster. Traffic on one node that needs to be processed on the other node or to exit through an interface on the other node passes over the fabric. Session state information also passes over the fabric.

Requirements

Before you begin, set the chassis cluster ID and chassis cluster node ID. See Example: Setting the Chassis Cluster Node ID and Cluster ID.

Overview

In most SRX Series devices in a chassis cluster, you can configure any pair of Gigabit Ethernet interfaces or any pair of 10-Gigabit interfaces to serve as the fabric between nodes.

You cannot configure filters, policies, or services on the fabric interface. Fragmentation is not supported on the fabric link.

The maximum transmission unit (MTU) size supported is 9014. We recommend that no interface in the cluster exceed this MTU size. Jumbo frame support on the member links is enabled by default.

This example illustrates how to configure the fabric link with dual fabric links with different slots and ports on each node.

Make sure you physically connect the RTO-and-probes link to the RTO-and-probes link on the other node. Likewise, make sure you physically connect the data link to the data link on the other node.

That is, physically connect the following two pairs:

  • The node 0 RTO-and-probes link ge-2/1/9 to the node 1 RTO-and-probes link ge-11/0/0

  • The node 0 data link ge-2/2/5 to the node 1 data link ge-11/3/0

Only the same type of interfaces can be configured as fabric children, and you must configure an equal number of child links for fab0 and fab1.

Note

If you are connecting each of the fabric links through a switch, you must enable the jumbo frame feature on the corresponding switch ports. If both of the fabric links are connected through the same switch, the RTO-and-probes pair must be in one virtual LAN (VLAN) and the data pair must be in another VLAN. Here too, the jumbo frame feature must be enabled on the corresponding switch ports.

Configuration

CLI Quick Configuration

To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

Step-by-Step Procedure

To configure the chassis cluster fabric with dual fabric links with different slots and ports on each node:

  • Specify the fabric interfaces.

Results

From configuration mode, confirm your configuration by entering the show interfaces command. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.

For brevity, this show command output includes only the configuration that is relevant to this example. Any other configuration on the system has been replaced with ellipses (...).

If you are done configuring the device, enter commit from configuration mode.

Verification

Verifying the Chassis Cluster Fabric

Purpose

Verify the chassis cluster fabric.

Action

From operational mode, enter the show interfaces terse | match fab command.

user@host> show interfaces terse | match fab