User manual HP PROLIANT BL P-CLASS GBE INTERCONNECT SWITCHES

[. . . ] HP ProLiant BL p-Class GbE Interconnect Switch User Guide February 2003 (Second Edition) Part Number 263680-002 HP CONFIDENTIAL Codename: DeLorean Part Number: 263680-002 Last Saved On: 2/4/03 10:46 AM © 2002, 2003 Hewlett-Packard Development Company, L. P. Microsoft®, Windows®, and Windows NT® are U. S. registered trademarks of Microsoft Corporation. trademark of Netscape Communications Corporation. [. . . ] A port in the learning state: · · Discards frames received from the network segment to which it is attached. Discards packets sent from another port on the switch for forwarding. E-4 HP ProLiant BL p-Class GbE Interconnect Switch User Guide HP CONFIDENTIAL Codename: DeLorean Part Number: 263680-002 Last Saved On: 2/4/03 10:56 AM Spanning Tree Protocol · · · · Adds addresses to its forwarding database. Receives BPDUs and directs them to the processor. Processes and transmits BPDUs received from the processor. Receives and responds to network management messages. Figure E-3: Learning state HP ProLiant BL p-Class GbE Interconnect Switch User Guide E-5 HP CONFIDENTIAL Codename: DeLorean Part Number: 263680-002 Last Saved On: 2/4/03 10:56 AM Spanning Tree Protocol Forwarding State A port in the forwarding state forwards packets. The port enters the forwarding state from the learning state when the forward delay timer expires. A port in the forwarding state: · · · · · Forwards packets received from the network segment to which it is attached. Forwards packets sent from another port on the switch. Incorporates station location information into its address database. Receives BPDUs and directs them to the system processor. Receives and responds to network management messages. E-6 HP ProLiant BL p-Class GbE Interconnect Switch User Guide HP CONFIDENTIAL Codename: DeLorean Part Number: 263680-002 Last Saved On: 2/4/03 10:56 AM Spanning Tree Protocol Figure E-4: Forwarding state Disabled State A port in the disabled state does not participate in frame forwarding or STP. A port in the disabled state is virtually nonoperational. A disabled port: · · Discards packets received from the network segment to which it is attached. Discards packets sent from another port on the switch for forwarding. HP ProLiant BL p-Class GbE Interconnect Switch User Guide E-7 HP CONFIDENTIAL Codename: DeLorean Part Number: 263680-002 Last Saved On: 2/4/03 10:56 AM Spanning Tree Protocol · · · · Does not add addresses to its forwarding database. Receives BPDUs, but does not direct them to the system processor. Does not receive BPDUs for transmission from the system processor. Receives and responds to network management messages. Figure E-5: Disabled state E-8 HP ProLiant BL p-Class GbE Interconnect Switch User Guide HP CONFIDENTIAL Codename: DeLorean Part Number: 263680-002 Last Saved On: 2/4/03 10:56 AM Spanning Tree Protocol Troubleshooting STP This section describes several troubleshooting tips. Spanning Tree Protocol Failure A failure in STP generally leads to a bridging loop. A bridging loop in an STP environment comes from a port that should be in the blocking state, but is forwarding packets. Figure E-6: Example of Spanning Tree Protocol failure In the example, switch B has been elected as the designated bridge, and port 2 on switch C is in the blocking state. The election of switch B as the designated bridge is determined by the exchange of BPDUs between switches B and C. Switch B continues sending BPDUs advertising its superiority over the other bridges on the LAN. If switch C fails to receive these BPDUs for longer than the max age (default of 20 seconds), it could start to transition its port 2 from the blocking state to the forwarding state. IMPORTANT: A port must continue to receive BPDUs advertising superior paths to remain in the blocking state. There are a number of circumstances in which STP can fail, mostly related to the loss of a large number of BPDUs. These situations will cause a port in the blocking state to transition to the forwarding state. HP ProLiant BL p-Class GbE Interconnect Switch User Guide E-9 HP CONFIDENTIAL Codename: DeLorean Part Number: 263680-002 Last Saved On: 2/4/03 10:56 AM Spanning Tree Protocol Full/Half Duplex Mismatch A mismatch in the duplex state of two ports is a very common configuration error for a point-to-point link. [. . . ] Possible Cause The TFTP server is not available to connect to or there is connectivity failure between the GbE Interconnect Switch and the TFTP server. Possible Solution · · Make sure that the IP address of the TFTP server is correct. Make sure that the TFTP server and the GbE Interconnect Switch are on the same network or VLAN. Make sure that you can ping the TFTP server from the GbE Interconnect Switch and vice versa. · The TFTP server was started with a configured directory. The GbE Interconnect Switch must be configured using the full path name, if it is not in the directory specified in the TFTP server. J-8 HP ProLiant BL p-Class GbE Interconnect Switch User Guide HP CONFIDENTIAL Codename: DeLorean Part Number: 263680-002 Last Saved On: 2/4/03 11:02 AM Troubleshooting Table J-4: Troubleshooting: Upgrading Firmware Using the Serial Port Problem On the serial console screen, a message that GbE Interconnect Switch failed to load runtime image (firmware) is displayed. [. . . ]