HP 279720-B21 HP ProLiant BL p-Class GbE Interconnect Switch User Guide - Page 96

Troubleshooting Table J-2: Troubleshooting: Configuring Problem After connecting more than one port to another switch or destination device, the port activity LEDs continuously indicate activity. Possible Cause Because there are multiple links across this device and the destination device, they form loops, which cause broadcast storms. While configuring VLANs, you cannot enable a port in multiple VLANs. A port can be part of only one VLAN unless the port is a tagged port. After assigning a port to multiple 802.1Q VLANs by configuring it as a tagged port, you check the PVID. It is equal to the first VLAN ID. Changing the first XConnect port settings changes the next XConnect port settings. But changes to the second XConnect port settings cannot be applied or saved. While assigning the ports to VLANs, the GbE Interconnect Switch does not let the user enable two adjacent ports into two different VLANs. While configuring SLIP settings, you cannot apply the setting after making the local IP address the same as the GbE Interconnect Switch IP address. After forcing the speed, duplex, and flow control on the port, the link does not come up and transfer data properly. For port-based VLANs, ports belong to only one VLAN and only one PVID can be assigned. Port-based VLANs can be extended to other switches by cross connecting ports that have the same PVID (the same port-based VLAN). By default, XConnect ports are bundled into a Port Trunk. The ports could be two adjacent ports that are bundled in a Port Trunk. Local IP addresses cannot be same as the GbE Interconnect Switch IP address. Local IP addresses should be a different IP address from the same subnet range. Both sides need to be forced to the same settings. In case of autonegotiation, both sides will negotiate and match the setting to make the correct link. Possible Solution From the Configure Spanning Tree settings screen, enable STP at switch level. From the Port Spanning Tree settings screen, enable STP at port level if you want multiple links. Make sure that the Bypass setting is disabled. This setting prevents loops and maintains standby links for resilience in case the primary links go down. Make sure that your VLANs are 802.1Q VLANs and enable the port as a tagged port from the 802.1Q Static VLAN Settings screen on the console interface or from the VLAN settings screen on the Web-based interface. By default, all the ports have PVID 1. The switch assigns to the port a PVID that is equal to the VLAN ID of the first VLAN that the port was enabled in. To manually configure a Port VLAN, refer the management interface reference guides. Because they are bundled in to a trunk, the settings of the first port are referenced and applied to the rest of the ports. So in a trunk, only the first port (reference port) is configurable and defines the characteristics of the other ports in the trunk. Two ports that are assigned to a Port Trunk cannot be assigned to two different VLANs. Either break the trunk to assign it two different VLANs or assign the ports to one VLAN. Make sure that the SLIP local IP address is not configured to be same as the GbE Interconnect Switch IP address. Make sure that it is from the same subnet range so that SLIP can function properly. • From the Configure Ports screen, make sure that the ports are forced to the same setting as the setting on the other end of the link. • Use a crossover cable in case of forced 10/100 speeds. J-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 11:02 AM