H3C S5120-EI Series Operation Manual page 263

Single-ring load balancing
Figure 1-6 Network diagram for single-ring load balancing
Domain 1
In a single-ring network, you can achieve load balancing by configuring multiple domains.
As shown in Figure 1-6, Ring 1 is configured as the primary ring of both Domain 1 and Domain 2. In
Domain 1, Device A is configured as the master node of Ring 1; in Domain 2, Device B is configured as
the master node of Ring 1. Such configurations enable the ring to block different links based on VLANs,
thus achieving single-ring load balancing.
Intersecting-ring load balancing
Figure 1-7 Network diagram for intersecting-ring load balancing
In an intersecting-ring network, you can also achieve load balancing by configuring multiple domains.
As shown in Figure 1-7, Ring 1 is the primary ring and Ring 2 is the subring in both Domain 1 and
Domain 2. Domain 1 and Domain 2 are configured with different protected VLANs. Device A is
configured as the master node of Ring 1 in Domain 1; Device D is configured as the master node of
Ring 1 in Domain 2. Device E is configured as the master node of Ring 2 in both Domain 1 and Domain
2. However, different ports on Device E are blocked in Domain 1 and Domain 2. After such
configurations, you can enable traffic of different VLANs to travel over different paths in the subring and
primary ring, thus achieving intersecting-ring load balancing.
Device A Device B
Ring 1
Device D Device C
Domain 2
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