Routing Test - Compaq ServerNet ServerNet II Installation Manual

Routing Test

The routing test verifies that IBC traffic can pass through the SAN along a specified path. If
IBC traffic can pass along that path, then every link in that path is connected and operating
correctly. The test implies nothing about the ability of network switches to route normal traffic
along a path; it simply verifies minimal connectivity capabilities.
How the Routing Test Works
During the routing test the local host attempts to communicate with a target node along a
specified Source Route using the IBC Single-Symbol Protocol. More precisely, the local host
writes data to an IBC Scratch-Pad memory area in the target node and then reads that data. The
test fails if either operation fails, or if the read data is different from the data written, as shown
in Figure H-7.
Local Host
Computer
Adapter
Figure H-7. Local Host Writes Data to an IBC Scratch-Pad Memory
The processor in every intervening node in the route must forward the IBC request from the
entry port to the outgoing port. The test fails if any node or connection along the route
has failed.
ServerNet
Write
Network
Read
ServerNet II Diagnostics Resources H-7
Target Node
IBC
Scratch-
pad
Memory