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Dedicated Signaling Control Channel
For each ring port, a dedicated signaling control channel with a dedicated VLAN ID
must be configured. In Ethernet ring configuration, only this control logical interface
is configured and the underlying physical interface is the physical ring port. Each
ring requires that two control physical interfaces be configured. These two logical
interfaces must be configured in a bridge domain in order to forward RAPS PDUs
between the two ring control physical interfaces. If the control channel logical interface
is not a trunk port, only control logical interfaces will be configured in ring port
configuration. If this control channel logical interface is a trunk port, in addition to
the control channel logical interfaces, a dedicated VLAN ID must be configured.
RAPS Message Termination
The RAPS message starts from the originating node, travels through the entire ring,
and terminates in the originating node unless a failure is present in the ring. The
originating node must drop the RAPS message if the source MAC address in the RAPS
message belongs to itself. The source MAC address is the node's node ID.
Manual Switch
Manual switch is not supported in this release.
Nonrevertive Switch
In revertive operation, once the condition causing a switch has cleared, traffic is
blocked on the RPL and restored to the working transport entity. In nonrevertive
operation, traffic is allowed to use the RPL if it has not failed, even after a switch
condition has cleared. Nonrevertive switching is not supported in this release.
Multiple Rings
The Ethernet ring control module supports multiple rings in each node, (two logical
interfaces are part of each ring). However, interconnection of multiple rings is not
supported in this release. The interconnection of two rings means that two rings may
share the same link or share the same node.
Control channel related terms:
if [destination is the RAPS PDU multicast
address(0x01,0x19,0xa7,0x00,0x00,
0x01] AND[ring port STP status is FORWARDING] AND [Incoming
interface
IFL equal to control channel IFL]
{ send packet to CPU and send to the other ring port }
default term: accept packet.
Understanding Ethernet Ring Protection Switching Functionality
Chapter 58: Configuring Ethernet Ring Protection Switching
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