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S2989G-24TX Operation Manual

Chapter 8 Debugging and Diagnosis Configuration

8-24

3. Destination switch: The switch to which the destination port for remote mirroring

belongs. It forwards mirrored flows it received from the Remote VLAN to the

monitoring device through the destination port.

When configuring the RSPAN mirroring of the source switch, reflector port mode or

destination mirror port mode can be selected. The destination switch will redirect all the

data frames in the RSPAN VLAN to the RSPAN destination port. For RSPAN mirroring,

normal mode and advanced mode can be chosen, normal is introduced by default and fit

the normal user. The advanced mode fit the advanced user.

1. Advanced mode: To redirect data frames in RSPAN VLAN to the RSPAN

destination port, the intermediary and destination devices should support the

redirection of flow.

2. Normal mode: To configure the RSPAN destination port in the RSPAN VLAN. Thus,

datagrams in the RSPAN VLAN will be broadcasted to the destination port. In this

mode, the destination port should be in RSPAN VLAN, and the source port should

not be configured for broadcasting storm control. TRUNK ports should be

configured carefully in order not to forward RSPAN datagrams to external

networks. The normal mode has the benefit of easy configuration, and reduced

system resources.

To be noticed: Normal mode is introduced by default. When using the normal mode,

datagrams with reserved MAC addresses cannot be broadcasted.

The number of the source mirror ports is not limited, and can be one or

more. Multiple source ports are not restricted to be in the same VLAN. The

destination port and the source ports can be in different VLAN.

For configuration of RSPAN, a dedicated RSPAN VLAN should be

configured first for carrying the RSPAN datagrams. The default VLAN, dynamic

VLAN, private VLAN, multicast VLAN, and the layer 3 interface enabled VLAN

cannot be configured as the RSPAN VLAN. The reflector port must belong to the

RSPAN VLAN. The destination port should be connected to the Monitor and the

configured as access port or the TRUNK port. The RSPAN reflector port will be

working dedicatedly for mirroring, when a port is configured as a reflector port, it

will discards all the existing connections to the remote peer, disable

configurations related to loopback interfaces, and stop forwarding datagram.

Connectivity between the source and destination switch for Remote VLAN,

should be made sure by configuration.

To be noticed:

1. Layer 3 interfaces related to RSPAN VLAN should not be configured on the

source, intermediate, and the destination switches, or the mirrored datagrams may be

discarded.