System information

Troubleshooting IBM
Book Title
10-220
Local SRB: Routing Does Not Function
Symptom: Routed protocols are not forwarded properly by routers in a local SRB environment.
SRBs bridge traffic normally.
Table 10-2 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 10-2 Local SRB: Routing Does Not Function
RSRB: Host Cannot Connect to Server (Peers Not Open)
Symptom: Hosts cannot make connections to servers across a router configured as a remote
source-routing bridge (RSRB). The output of the show source-bridge privileged exec command
shows that SRB peers are not open.
Note If you succeed in getting peers to open but hosts are still unable to communicate with servers,
refer to the section “RSRB: Host Cannot Connect to Server (Peers Open)” later in this chapter.
Table 10-3 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 10-3 RSRB: Host Cannot Connect to Server (Peers Not Open)
Possible Problem Solution
Routing problem For detailed information on troubleshooting routing problems, refer to the chapters in this
book that cover the routing protocols in question. For example, if you are running Novell
IPX, see Chapter 8, “Troubleshooting Novell IPX.”
Missing multiring
command
Step 1 Use the show running-config privileged exec command on the router. Look for a
multiring interface configuration command entry. This command enables the
collection and use of RIF information on router interfaces.
Step 2 If the multiring command is not present, add the command to the configuration
using the following command:
C4000(config-if)#multiring all
Incomplete ARP
1
table
1 ARP = Address Resolution Protocol
Step 1
Determine whether you can ping hosts.
Step 2 If the host does not respond, use the show arp exec command to determine whether
an entry for the host exists in the ARP table.
Step 3 If an entry exists, there is probably a routing problem. Determine whether you have
a source-route path to the destination hardware (MAC) address. Use the show rif
exec command to match the RIF with the hardware address of the host.
Step 4 If no entry exists, use a network analyzer to see whether ARP requests are getting
through to the remote ring and to see whether replies come back.