System information

Troubleshooting IBM 10-217
Local SRB: Host Cannot Connect to Server
Possible Problem Solution
Ring number
mismatch
A router interface configured for bridging fails to insert into a ring when it detects a ring
number mismatch, and posts an error message to the console.
Step 1 Get the ring number (specified in hexadecimal) from IBM SRBs (either by
examining the configuration of other SRBs or from the system administrator).
Step 2 Use the show running-config privileged exec command to view the
configuration of routers configured as SRBs. Look for source-bridge interface
configuration command entries that assign ring numbers (displayed in
decimal) to the rings that are connected to the router’s interfaces.
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For example, the following configuration entry shows the entry for local
ring 10, bridge number 500, and remote ring 20:
source-bridge 10 500 20
Note: Parallel bridges situated between the same two rings must have different
bridge numbers.
Step 3 Convert IBM SRB ring numbers to decimal and verify that the ring numbers
configured on all internetworking nodes agree.
Step 4 If the ring numbers do not agree, reconfigure the router interface or IBM SRBs
so that the ring numbers match. Use the source-bridge command to make
configuration changes; the syntax is as follows:
source-bridge source-ring-number bridge-number
target-ring-number [conserve-ring]
Syntax Description:
• source-ring-number—Ring number for the interface’s Token Ring or
FDDI
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ring. It must be a decimal number in the range 1 to 4095 that
uniquely identifies a network segment or ring within the bridged Token
Ring or FDDI network
Ring number
mismatch
• bridge-number—Number that uniquely identifies the bridge connecting the
source and target rings. It must be a decimal number in the range 1 to 15.
• target-ring-number—Ring number of the destination ring on this router. It
must be unique within the bridged Token Ring or FDDI network. The target
ring can also be a ring group. Must be a decimal number.
• conserve-ring—(Optional) Keyword to enable SRB over Frame Relay.
When this option is configured, the SRB software does not add the ring
number associated with the Frame Relay PVC
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, the partner’s virtual ring) to
outbound explorer frames. This option is permitted for Frame Relay
subinterfaces only.
Example:
In the following example, Token Rings 129 and 130 are connected via a router:
interface tokenring 0
source-bridge 129 1 130
!
interface tokenring 1
source-bridge active 130 1 129