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Ethernet switching is not supported on SRX-GP-2XE-SFPP-TX cards. This implies that any configuration, which requires that family ethernet-switching be configured, is not supported on these interfaces. For example, configuring the switching fabric interface (swfab).
Ethernet-switching in chassis cluster is supported on SRX from 11.1. To ensure that Layer 2 switching works seamlessly across chassis cluster nodes, a dedicated physical link to connect the nodes is required. This type of link is termed as a switching fabric interface (swfab). The configuration of swfab on SRX-GP-2XE-SFPP-TX will not work and is not supported. If it is configured on the interfaces of XPIM, you will see the ethernet switching status as down:
root@srx> show chassis cluster ethernet-switching interfaces
swfab0:
Name Status
xe-3/0/1 up
swfab1:
Name Status
xe-12/0/1 up
root@srx> show chassis cluster ethernet-switching status
Cluster ID: 2
Node Priority Status Preempt Manual failover
Redundancy group: 0 , Failover count: 0
node0 1 primary no no
node1 1 secondary no no
Ethernet switching status:
Probe state is DOWN. Both nodes are in separate ethernet switching domain(s).
root@srx> show chassis cluster ethernet-switching statistics
Switch fabric link statistics:
Probe state : DOWN
Probes sent: 0
Probes received: 0
Probe recv errors: 0
Probe send errors: 0