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    Layer 2 Ethernet Switching Capability in a Chassis Cluster Mode

    Understanding Layer 2 Ethernet Switching Capability in a Chassis Cluster on SRX Series Devices

    Ethernet ports support various Layer 2 features such as spanning-tree protocols (STPs), IEEE 802.1x, Link Layer Discovery Protocol (LLDP), and Multiple VLAN Registration Protocol (MVRP). With the extension of Layer 2 switching capability to devices in a chassis cluster, you can use Ethernet switching features on both nodes of a chassis cluster.

    Figure 1 shows the Layer 2 switching across chassis cluster nodes.

    Figure 1: Layer 2 Ethernet Switching Across Chassis Cluster Nodes

    Layer 2 Ethernet
Switching Across Chassis Cluster Nodes

    To ensure that Layer 2 switching works seamlessly across chassis cluster nodes, a dedicated physical link connecting the nodes is required. This type of link is called a switching fabric interface. Its purpose is to carry Layer 2 traffic between nodes.

    Note: Configuring a LAG with members and reth interface with family ethernet switching across nodes is not supported.

    Caution: If a switching fabric interface is not configured on both nodes, and if you try to configure Ethernet switching-related features on the nodes, then the behavior of the nodes might be unpredictable.

    Understanding Chassis Cluster Failover and New Primary Election

    When chassis cluster failover occurs, a new primary node is elected and the Ethernet switching process (eswd) runs in a different node. During failover, the chassis control subsystem is restarted. Also during failover, traffic outage occurs until the PICs are up and the VLAN entries are reprogrammed. After failover, all Layer 2 protocols reconverge because Layer 2 protocol states are not maintained in the secondary node.

    Note: The Q-in-Q feature in chassis cluster mode is not supported because of chip limitation for swfab interface configuration in Broadcom chipsets.

    Benefits of Ethernet Switching on Chassis Cluster

    • Enables Ethernet switching functionality on both nodes of a chassis cluster and provides the option to configure the ethernet ports on either node for family Ethernet switching.

    • Enables configuring a Layer 2 VLAN domain with member ports from both nodes and the Layer 2 switching protocols on both devices.

    Modified: 2018-03-29