ServerNet Cluster Manual

Upgrading a ServerNet Cluster
ServerNet Cluster Manual—520575-003
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Connecting the Two-Lane Links
Connecting the Two-Lane Links
When the Add Switch guided procedure indicates that the two-lane links can be
connected between the cluster switches in different star groups, connect the two-lane
links for the specified fabric. Use the following steps:
1. Label both ends of each fiber-optic cable to be used for the two-lane links. On the
label, include the fabric and cluster switch position (X1, for example) and the port
number (8, for example) to which the cable will be connected.
2. If they are not already routed, route the fiber-optic ServerNet cables to be used for
the two-lane links.
3. Remove the black plugs from ports 8 through 11 on the double-wide PICs inside
each switch enclosure.
4. Remove the dust caps from the fiber-optic cable connectors.
Caution. Do not connect the two-lane links for the tri-star topology until the Add Switch guided
procedure instructs you to do so. Connecting the two-lane links between cluster switches
running the T0569AAA configuration can cause an outage on every node in the cluster. Power
cycling each node might be necessary to recover from this outage.
Outages can occur because the cluster is unprotected by the neighbor-checking logic if cluster
switches running the T0569AAA configuration are connected. Connecting cluster switches
running the T0569AAA configuration can create an invalidly configured tri-star topology in
which ServerNet packets loop indefinitely between the cluster switches.
Caution. Before connecting ServerNet cables, inspect the cables as described in Connecting
a Fiber-Optic Cable to an MSEB or ServerNet II Switch on page 3-18. Using defective
connectors can cause ServerNet connectivity problems.
Note. ServerNet II Switch ports 8, 9, 10, and 11 are keyed differently from ports 0 through
7. To connect the two-lane link cables, you must align the fiber-optic cable connector with
the key on top. See Figure 4-13
.
Figure 4-13. Key Positions on ServerNet II Switch Ports
Ports 0-7
Ports 8-11
VST111.vsd
Keys
Keys