The ERSPAN feature allows the mirroring of traffic on one switch to be sent over a GRE tunnel to another switch for analysis. In this scenario, traffic from Linux1 on Switch1 is being mirrored to Linux2 on Switch2 using an ERSPAN tunnel. The command (config-mon-erspan-dst-src)# origin ip address 172.16.10.10 is required at the destination configuration to specify the source IP address of the mirrored traffic, which in this case is 172.16.10.10. References := Implementing and Operating Cisco Service Provider Network Core Technologies study guide or official documentation.