IBM Power Systems 775 Manual page 52

Figure 1-26 Routing within a single CEC
The following conditions exist when source and destination hubs lie within a supernode, as
shown in Figure 1-27:
Route is one L-hop (every hub within a supernode is directly connected via Lremote link to
every other hub in the supernode).
LNMC needs to know only the local link status in this CEC.
Figure 1-27 L-hop
If an L-remote link is faulty, the route requires two hops. However, only the link status local to
the CEC is needed to construct routes, as shown in Figure 1-28.
Figure 1-28 Route representation in event of a faulty Lremote link
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IBM Power Systems 775 for AIX and Linux HPC Solution