RSPAN Feature Limitations and Considerations

The following limitations and considerations apply when configuring RSPAN:
  • All participating devices must be connected by Layer 2 trunks.
  • Egress and ingress traffic mirroring is supported.
  • 20 source ports are supported.
  • A destination port must be a member of the RSPAN VLAN.
  • A source port cannot be configured unless a destination port is already configured.
  • Management ports, stack ports, MCT ports, and PE ports are not supported.
  • Only one RSPAN VLAN can be configured in a single network.
  • There is no limitation on the number of member ports.
  • STP and RSTP is supported on the RSPAN VLAN.
  • Normal VLAN commands are not applicable.
  • MAC learning is disabled on the RSPAN VLAN.
  • The RSPAN VLAN must be a non-existent VLAN in a switch and must be the same across the network.
  • Any VLAN can be configured as an RSPAN VLAN as long as all participating network devices support the configuration of RSPAN VLANs.
  • You must configure the RSPAN VLAN on all source, intermediate, and destination network devices.
  • If tagged, outgoing packets carry the RSPAN VLAN 802.1Q tag.
  • There is no distinction between forwarded traffic and mirrored traffic at the destination.
  • The RSPAN VLAN must be the same for the entire switched system for RSPAN forwarding rules to be followed to carry traffic to the analyzer port.
  • Static mac configuration is not allowed based on the VLAN provided.
  • The .1Q PRI field in the RSPAN header has a default of 0.
  • All packets are HW forwarded with no effect on the CPU.
  • Any logical ports checks do not take effect because traffic mirroring happens before all forwarding.
  • If the RSPAN VLAN is also used as a forwarding VLAN, each switch in the RSPAN network receives two streams of traffic (one stream of flooded traffic and another stream of mirrored traffic).
  • Any incoming packet with an RSPAN VLAN ID is forwarded within the network.
  • RSPAN does not support double tagged packets at source.
  • Mirrored L2 BPDU, UDLD, Stacking/ZTP/MRP/Ruckus Proprietary MACs are all suppressed at source.
  • ISSU is not supported.
Parent topic: Remote Switched Port Analyzer