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Troubleshooting Switch Level Issues and Interswitch Connectivity.pdf

Troubleshooting Switch Level Issues and Interswitch Connectivity.pdf

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C H A P T E R Send comments to [email protected] 3-1 Cisco MDS 9000 Family Troubleshooting Guide OL-3450-01, Cisco MDS SAN-OS Release 1.0(3a) 3 Troubleshooting Switch Level Issues and Interswitch Connectivity This chapter describes how to identify and resolve problems that affect basic connectivity between switches, hosts, and storage in the network fabric. The most common problems a system administrator can face may be categorized by two different scenarios: Switch-to-switch basic interconnectivity problems, which can result in the isolation of a port or VSAN due to incorrect parameters or settings on an ISL or VSAN Fabric to Server/Storage connectivity problems: identified by a Fx port not coming up or caused by zone or VSAN configuration errors This section will present some of the most common scenarios, in which either switch-to-switch basic connectivity problems or fabric to end-devices problems can be found. These scenario are grouped in three different sections: Troubleshooting E Port Connectivity - ISL Isolation, page 3-1 Troubleshooting TE Port Connectivity - VSAN Isolation, page 3-10 Troubleshooting Fx Port Connectivity, page 3-13 Troubleshooting E Port Connectivity - ISL Isolation This section describes how to troubleshoot Inter-Switch Link (ISL) isolation, which may occur when you try to merge two separate fabrics or add a new domain to an existing fabric. It includes the following topics: Overview, page 3-2 Troubleshoot Switch and Port Parameters, page 3-3 Troubleshooting a ZONE Merge Failures, page 3-5 Troubleshooting a VSAN Configuration Conflict, page 3-6 Troubleshooting a Domain ID Conflict, page 3-7
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Send comments to [email protected] 3-2 Cisco MDS 9000 Family Troubleshooting Guide OL-3450-01, Cisco MDS SAN-OS Release 1.0(3a) Chapter 3 Troubleshooting Switch Level Issues and Interswitch Connectivity Troubleshooting E Port Connectivity - ISL Isolation Overview On an E port, only one VSAN can be passed and possibly be isolated. However, in a trunking E port (TE), multiple VSANs can become isolated while others are passing traffic. The same troubleshooting approach applies in both cases, except that on a trunking E port the troubleshooting may need to be done on a per-VSAN basis and/or on multiple VSANs. Step 1) Verify that each VSAN is able to see the other switches within the same VSAN. To verify that each switch is able to see the other switches, issue the following command at the exec prompt. This command is VSAN-specific. If a specific VSAN is omitted from the command, it will list the output for all VSANs. switch# show fcdomain domain-list vsan 1 The output of the command lists set of domain IDs and associated WWNs for each switch within a VSAN. This list provides the WWN of the switches owning each domain ID and the information about the principality of those switches in the fabric or VSAN they belong to.
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