3com S7906E Instruccion De Instalación

 

1-6 

z 

If the ring is torn down, the secondary port of the master node will fail to receive Hello packets 

before the Fail timer expires. The master node will release the secondary port from blocking data 

VLANs while sending Common-Flush-FDB packets to instruct all transit nodes to update their own 

MAC entries and ARP/ND entries.  

The transit node, the edge node or the assistant-edge node sends Link-Down packets to the master 

node immediately when they find any of its own ports belonging to an RRPP domain is down. Upon the 

receipt of a Link-Down packet, the master node releases the secondary port from blocking data VLANs 

while sending Common-Flush-FDB packet to instruct all the transit nodes, the edge nodes and the 

assistant-edge nodes to update their own MAC entries and ARP/ND entries. After each node updates 

its own entries, traffic is switched to the normal link.  

The master node may find the ring is restored after a period of time after the ports belonging to the 

RRPP domain on the transit nodes, the edge nodes, or the assistant-edge nodes are brought up again. 

A temporary loop may arise in the data VLAN during this period. As a result, broadcast storm occurs. 

To prevent temporary loops, non-master nodes block them immediately (and permit only the packets of 

the control VLAN to pass through) when they find their ports accessing the ring are brought up again. 

The blocked ports are activated only when the nodes are sure that no loop will be brought forth by these 

ports.  

As shown in

 Figure 1-5

, Ring 1 is the primary ring, and Ring 2 and Ring 3 are subrings. When the two 

SRPTs between the edge node and the assistant-edge node are down, the master nodes of Ring 2 and 

Ring 3 will open their respective secondary ports, and thus a loop among Device B, Device C, Device E, 

and Device F is generated. As a result, broadcast storm occurs.  

In this case, to prevent generating this loop, the edge node will block the edge port temporarily. The 

blocked edge port is activated only when the edge node is sure that no loop will be brought forth when 

the edge port is activated.  

In a ring network, maybe traffic of multiple VLANs is transmitted at the same time. RRPP can implement 

load balancing for the traffic by transmitting traffic of different VLANs along different paths.  

By configuring an individual RRPP domain for transmitting the traffic of the specified VLANs (referred to 

as protected VLANs) in a ring network, traffic of different VLANs can be transmitted according to 

different topologies in the ring network. In this way, load balancing is achieved.  

As shown in

, Ring 1 is configured as the primary ring of Domain 1 and Domain 2, which are 

configured with different protected VLANs. Device A is the master node of Ring 1 in Domain 1; Device B 

is the master node of Ring 1 in Domain 2. With such configurations, traffic of different VLANs can be 

transmitted on different links, and thus, load balancing is achieved in a single-ring network.  

In an edge node RRPP ring group, only an activated subring with the lowest domain ID and ring ID can 

send Edge-Hello packets. In an assistant-edge node RRPP ring group, any activated subring that has 

received Edge-Hello packets will forward these packets to the other activated subrings. With an edge