Fujitsu BX600 SB9 manual Combining RAPID-PVST and 802.1w, Rapid Spanning Tree

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White Paper ⏐ Issue: October 2006 ⏐ Integration of BX600 SB9 Switches in Cisco Networks

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Rapid Spanning Tree

The standard IEEE 802.1w (RSTP) defines only BPDUs in the native VLAN as implemented by the SB9. Cisco also enhanced RSTP to RAPID-PVST which is compatible to RSTP in a number of ways. Figure 5 shows this scenario.

Figure 5 : Combining RAPID-PVST and 802.1w

All RSTP features are functioning for the native (in this example VLAN1). Since the SB9 implements the standard, and does not know about tagged BPDUs, RAPID-PVST has the same restrictions as PVST+.

There is an additional problem due to the fact that RSTP generates a Topology Change Notification (TCN) only when changing a port to the state “designated”. If the Po1 link in Figure 5 fails, port Po1 of switch A will go down and will not generate a TCN as specified in 802.1w. SB9 will change the role of port Po2 to root port and its state to “forwarding” and will generate a TCN as specified in 802.1w on the native VLAN. This has the effect that the Cisco switches will flush their MAC address tables of VLAN 1 but not for the other VLANs.

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Contents Basic Multicast Services Contents Introduction Switch ConnectivitySwitch Management Page Introduction Configuration Recommended SolutionAuto Negotiation Port Aggregation Network problemsShut down the affected ports to avoid loops Set up the port-channelVerify the operation of the port-channels Bring up the affected portsVLANs and Trunks Vlan Trunk between SB9 and Cisco SwitchConfigure Vlan trunk Configure the port-channelsDefine the VLANs Gvrp Verify the Vlan trunkRunning ST P 802.1D with PVST+ on Vlan Trunks Spanning Tree ProtocolRunning PVST+ on Vlan Trunks while disabling STP at the SB9 SB9Rapid Spanning Tree Combining RAPID-PVST and 802.1wCombining RAPID-PVST and 802.1w after failure of Po1 Configuration with Vlan Trunks SB9 SwitchConfigure the switches Network loopsPage Page STP Verify the configurationPage Configuration without Vlan Trunks Configuration example Rstp without Vlan trunksPage Mode Type State Role Enabled Forwarding Designated Disabled Enabled Disabled PC Mbr Manual forwarding Interface BX600 port mapping Access Port and NIC ConfigurationConfigure the access ports of the switches Typical access port configurationConfigure the Broadcom NIC Page Configure the Intel Adapter Page Select Switch Fault Tolerance and press Next Press Finish Link State Configure a Link State GroupConfiguration Recommended solutionEnable multicast routing and Igmp at the layer 3 switch Enable Igmp snooping at all Layer 2 switchesVlan Page Configure the SB9 for unicast Sntp Configuration of syslog and SntpConfigure the SB9 for broadcast Sntp Configure the SB9 for logging and syslogTest the configuration Configure Snmp for SNMPv1 and SNMPv2c Configuration of SnmpConfigure SNMPv3 authentication SnmpConfiguration of SSH Remote Console AccessConfigure the SB9 Test the loginIntegration into Radius and TACACS+ Configuration of RadiusPrepare the ACS Page Specify the user’s password and press Submit Test the login Configuration of Tacacs Page Configure the SB9 Check the configuration Configuration of CDPCisco Discovery Protocol Port Monitoring Configuration of Port MonitoringFurther information in the Internet