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.