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Is the failure symptom that particular protocols are not being
passed through to another ring?
 Go
to page 8.1.
Is the failure symptom that no data traffic can get from one
side of the router to the other, or that data is intermittently getting
corrupted when passed through the router?
Go
to page 8.2.
Is the failure symptom that only partial data traffic can pass
across the router?
Go
to page 8.3.
Is the failure symptom that an overloaded bandwidth condition
is present on a certain ring?
Go
to page 8.4.
 This procedure is generic
as to the router manufacturer. For some of the troubleshooting steps mentioned
on this page, reference the router manufacturer's documentation for any
special predefined methods for checking router configuration and for router
testing.
8.1 Particular
protocols are not being passed through to another ring.
Thoroughly check the router's software and hardware configuration, as
related to the router's protocol-routing table.
Are any incorrect configuration parameters present in the router's
protocol-routing table, as related to the specific protocol that is not
properly being passed through to the destination ring?
Take the necessary action to resolve
the problem and retest the router for proper operation. If the failure
symptom is gone, record the problem in the network maintenance and service
log. If the problem still exists after retesting, go to the next step .
 Attempt to run router diagnostics.
Did running the diagnostics produce any errors tha t identify a router
failure?
Take the necessary action to resolve
the problem and retest the router for proper operation. If the failure
symptom is gone, record the problem in the network maintenance and service
log. If the problem still exists after retesting, go to the next step .
A configuration problem may still
exist with the router, but to get more conclusive fault-isolation data,
go to page 15.
When running a protocol analysis
session on the ring, keep in mind that a router's main purpose is to connect
rings that need to share the same protocols; they must understand and be
configured for the protocol that they are forwarding.
If after using this procedure
you cannot conclusively locate the problem and you continue to find failure
symptoms that point to a router problem, reference the manufacturer's instructions.
8.2 No data
traffic can get from one side of the router to the other, or data is intermittently
getting corrupted when passed through the router.
Thoroughly check the software and hardware configuration of the router.
Are any incorrect configuration parameters present in the router?
Take the necessary action to resolve
the problem and retest the router for proper operation. If the failure
symptom is gone, record the problem in the network maintenance and service
log. If the problem still exists after retesting, go to the next step .
Attempt to run router diagnostics.
Did running the diagnostics produce any errors that identify a router
failure?
Take the necessary action to resolve
the problem and retest the router for proper operation. If the failure
symptom is gone, record the problem in the network maintenance and service
log. If the problem still exists after retesting, go to the next step .
A problem with the router may still
exist, but to get more conclusive fault-isolation data, go to page
15 .
If after using this procedure
you cannot conclusively locate the problem and continue to find failure
symptoms that point to a router problem, reference the manufacturer's instructions.
8.3 Only partial
data traffic can pass across the router.
Thoroughly check the software and hardware configuration of the router.
Are any incorrect configuration parameters present in the router?
Take the necessary action to resolve
the problem and retest the router for proper operation. If the failure
symptom is gone, record the problem in the network maintenance and service
log. If the problem still exists after retesting, go to the next step .
Check the ring for source-routing
problems with certain ring stations. Thoroughly examine the Routing Information
field of the frames that are not being passed through the router.
Keep in mind that a particular ring station can have a software application
configuration problem in relation to the source-routing field that it is
directly transmitting.
Did examining the ring for source-routing problems locate any specific
problems with a certain ring station's Routing Information field?
Take the necessary action to resolve
the source-routing problems with the respective ring station's source-routing
parameters, and then retest the router for proper operation. If the failure
symptom is gone, record the problem in the network maintenance and service
log. If the problem still exists after retesting, go to the next step .
Attempt to gather more conclusive
fault-isolation data by thoroughly examining the Routing Information field
from all the frames that are not being passed through the router. Go to
page 15 .
If after using this procedure
you cannot conclusively locate the problem and continue to find failure
symptoms that point to a router problem, reference the manufacturer's instructions.
8.4 An overloaded
bandwidth condition is present on a certain ring.
Thoroughly check the router for any incorrect configuration parameters
that can control the amount of traffic to be forwarded to another ring.
Are any incorrect configuration parameters present in the router?
Take the necessary action to resolve
the problem and retest the router for proper operation. If the failure
symptom is gone, record the problem in the network maintenance and service
log. If the problem still exists after retesting, go to the next step .
Check the source ring for source-routing
problems with certain ring stations. Thoroughly examine the Routing Information
field of the frames possibly causing bandwidth problems in the destination
ring .
Keep in mind that a particular
ring station can have a software application configuration problem in relation
to the source-routing field that it is directly transmitting.
Did examining the ring for source-routing problems locate any specific
problems with a certain ring station's Routing Information field?
Take the necessary action to resolve
the source-routing problems with the respective ring station's source-routing
parameters, and then retest the router for proper operation. If the failure
symptom is gone, record the problem in the network maintenance and service
log. If the problem still exists after retesting, go to the next step .
Attempt
to gather more conclusive fault-isolation data. Go to page 15.
Thoroughly examine the Routing
Information field from all the frames for incorrect addressing information
for source routing that may be causing an overhead problem from one ring
to another. Look closely at the percentage of frames being forwarded that
are overloading the destination ring with traffic.
If after using this procedure
you cannot conclusively locate the problem and continue to find failure
symptoms that point to a router problem, reference the manufacturer's instructions.
November 15, 1996
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