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Hierarchy Level


Configure the Address Resolution Protocol (ARP) in a spanning-tree network so that when a spanning-tree protocol topology change notification (TCN) is issued, the VLAN with a broken link can relearn MAC addresses from another, redundant VLAN in the network. The network must include a routed VLAN interface (RVI).

When a link fails in a spanning-tree network (RSTP, STP, MSTP, or VSTP), a message called a TCN is issued that causes all affected Ethernet switching table entries to be flushed. The network must then relearn the MAC addresses using flooding. If you have configured an RVI on the network, you have the option of having the VLAN with the broken link relearn MAC addresses from another VLAN using ARP, thereby avoiding excessive flooding on the VLAN with the broken link.


ARP on STP is disabled.

Required Privilege Level

system—To view this statement in the configuration.

system-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 11.2.