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SET PORT {slot.port} STATIC_SWITCH {enable|disable}
If you try to switch a port with
enabled
static switch from one segment to
another, you will get the an error message. This is shown in Figure 89.
8260> set port 6.1 static_switch enable
Port 06.01 static switch set to ENABLED.
8260>
8260> show port 6.1 verbose
Port Display for Module T18PSA :
Port Mode Status Network General Information
----- -------- ------------------- ---------------- --------------------
06.01 ENABLED OKAY TOKEN_RING_10
Alert Filter: DISABLED
Port Connector: RJ45S
Dip Network Setting: TOKEN_RING_1
Static Switch: ENABLED
8260> set port 6.1 network token_ring_1
Port 06.01 static switch enabled and phantom present: command aborted.
8260>
Figure 89. Switching Ports with Enabled Static Switch
Also, note that apart from the possible problem discussed above, there are some
other situations that may cause a problem when you switch an open adapter
from one network to another. For example, in Figure 90 on page 148, station
″A″ is attached to ″ring 1″ and is communicating with the SNA host via the 3745
attached to ″ring FFF″. As the path between station ″A″ and the host involves a
source routing bridge (bridge 1), the Routing Information field used in the frames
between station ″A″ and the host contains ring ″1″, bridge ″1 and ring ″FFF″.
Now, if in the middle of your SNA session, you switch station A to ″ring 2″, the
actual path between station ″A″ and the host will change, while station A and the
host still use the old Routing Information field. This will result in the frames sent
by station ″A″ not being delivered to the host and vice versa, the frames sent by
the host will not be delivered to station ″A″. The result of this is that your
stations will lose contact and the SNA session will be terminated after your SNA
timeout period. Of course, after the session termination, station ″A″ can try to
contact the host using the route discovery in source routing. This will result in
the new route (ring ″2″, bridge ″2″, ring ″FFF″) being discovered and a new
session being established. So, in this case the switching of the port from one
segment to another, results in the termination and re-establishment of existing
sessions.
Chapter 8. 8260 Token-Ring Support 147