On Cisco Nexus 9000 Series Switches, when using ERSPAN (Encapsulated Remote SPAN) to capture traffic across switches, you can limit the size of the mirrored (sniffed) packet using the marker-packet configuration. Setting marker-packet 1000 ensures that only the first 1000 bytes of each packet are mirrored, which helps conserve bandwidth while still capturing relevant header and partial payload information. MTU size controls the maximum transmission unit, not the SPAN capture size. ACL with packet- length is used for filtering, not for SPAN capture byte limits. Rate-limiting limits traffic throughput, not capture size.