Reserve a VLAN with the remote-mirroring keyword in all the intermediate switches for remote mirroring. When you enable mirroring with remote-tag 1000, you need to reserve a VLAN with tag 1000 in all the intermediate switches for remote mirroring. The remote mirroring VLAN in the intermediate switches is used for carrying the mirroring traffic to the destination switch. The ports connecting the source and destination switches are added as tagged in the intermediate switches.
Another way to configure a remote mirroring VLAN is to create a normal VLAN and disable learning on the VLAN. IGMP snooping must be disabled on that VLAN for you to remotely mirror multicast packets through the switch.