Troubleshooting

Table I-2: Troubleshooting: Configuring

Problem

Possible Cause

Possible Solution

After connecting more

Since there are multiple links across

From the Configure Spanning Tree settings

than one port to another

this device and the destination device,

screen, enable STP at switch level. From the

switch or destination

they form loops, which cause

Port Spanning Tree settings screen, enable

device, the port activity

broadcast storms.

STP at port level, if you want multiple links.

LEDs continuously

 

Make sure that the Bypass setting is disabled.

indicate activity.

 

This will avoid loops and maintain standby

 

 

links for resilience in case the primary links go

 

 

down.

 

 

 

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.

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 console interface, or the VLAN settings screen on Web-based interface.

After assigning a port to

For port-based VLANs, ports belong

By default, all the ports have PVID 1. The

multiple 802.1Q VLANs by

to only one VLAN and only one PVID

switch assigns to the port a PVID that is equal

configuring it as tagged

can be assigned. Port-based VLANs

to the VLAN ID of the first VLAN that the port

port, you check the PVID.

can be extended to other switches by

was enabled in. To manually configure a Port

It is equal to the first

cross connecting ports that have the

VLAN, refer to “Configuring a Port VLAN” in

VLAN ID.

same PVID (the same Port based

the management interface reference guides.

 

VLAN).

 

 

 

 

Changing the first

By default, XConnect ports are

Since they are bundled into a trunk, the

XConnect port settings

bundled into a port trunk.

settings of the first port are referenced and

changes the next

 

applied to the reset of the ports. So in a trunk,

XConnect port settings.

 

only the first port (reference port) is

But changes to the second

 

configurable and defines the characteristics of

XConnect port settings

 

the other ports in the trunk.

cannot be applied or

 

 

saved.

 

 

 

 

 

While assigning the ports to VLANs, the interconnect switch does not let the user enable two adjacent ports into two different VLANs.

The ports could be two adjacent ports that are bundled in a port 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.

After forcing the speed, duplex, and flow control on the port, the link does not come up and transfer data properly.

Both sides need to be forced to the same settings. In case of auto- negotiation, both sides will negotiate and match the setting to make the correct link.

•From the Configure Ports screen, make sure 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.

I-6

HP ProLiant BL e-Class C-GbE Interconnect Switch User Guide