Hierarchical Topology - 3Com CoreBuilder 7000 Operation Manual

Hierarchical Topology

LANE redundancy
As discussed previously, the routing algorithm of E-IISP assumes that you
have constructed your network with a hierarchical topology.
As an example, create a hierarchical switch topology consisting of three
trees.
1 In the A tree, illustrated in Figure 13, assign to the root node the prefix
47.00.00.00.00.00.00.00.00.A*.
2 Assign the two switches one level lower the prefixes
47.00.00.00.00.00.00.00.00.A2* and 47.00.00.00.00.00.00.00.00.A5*.
3 Assign the third-level switches 47.00.00.00.00.00.00.00.00.A2.7* and
47.00.00.00.00.00.00.00.00.A1.53*.
4 Define the fourth-level switches in a similar manner.
This defines a tree whose common element is A (the 'A' tree). By a similar
procedure you create a 'B' tree and a 'C' tree making sure that you
connect the three roots A, B, and C.
A
A2
A27
Planning a Network with E-IISP
An address with two significant
nibbles is one level lower in the
A5
tree hierarchy than one significant
nibble.
Three significant nibbles
indicate a third level address.
A53
Note that the higher-order
nibbles are the second-level
address.
X significant nibbles
indicate an X level address.
A536
A531
Note that the higher-order
nibbles are the X-1 level
address.
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