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Figure 22-2 Example of using the Ring Protocol together with a Spanning Tree Protocol
The Switches only perform forwarding of virtual link control frames (described below) and
clearing of MAC address table entries. For details about operations when using the Ring
Protocol together with a Spanning Tree Protocol and about virtual links, see the manuals for
AX series switches (such as AX2400S, AX3600S, and AX6700S series switches).
(1) Forwarding of virtual link control frames of a Spanning Tree Protocol
Any two switches that use the Ring Protocol together with a Spanning Tree Protocol are
connected by virtual links. Virtual links are built between two switches on a ring network. A
virtual VLAN set on the ring network is used to send and receive control frames between
virtual links (virtual link control frames). A VLAN belonging to the data transfer VLAN group
on the ring ports is used as the virtual VLAN.
The Switch in the ring network only performs forwarding of virtual link control frames.
(2) Clearing the MAC address table during Spanning Tree topology changes
When the topology is changed for a Spanning Tree Protocol, a flush control frame is sent on
the virtual link VLAN so that MAC address table entries are cleared for the entire single ring
or multi-ring network. Each switch receiving this in the ring network clears MAC address
table entries for ring ports for which the Ring Protocol is running.
The Switch in the ring network also clears MAC address table entries when a flush control
frame is received.
22 Using the Ring Protocol with Spanning Tree Protocols/GSRP
and the positions of the Switches (multi-ring configuration)
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