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PowerConnect B-Series FCX Configuration Guide 47
53-1002266-01
Configuring basic port parameters
2
NOTE
When Gbps negotiation mode is turned off (CLI command gig-default neg-off), the Dell device may
inadvertently take down both ends of a link. This is a hardware limitation for which there is currently
no workaround.
Modifying port priority (QoS)
You can give preference to the inbound traffic on specific ports by changing the Quality of Service
(QoS) level on those ports. For information and procedures, refer to Chapter 17, “Configuring
Quality of Service”.
Dynamic configuration of Voice over IP (VoIP) phones
You can configure a PowerConnect device to automatically detect and re-configure a VoIP phone
when it is physically moved from one port to another within the same device. To do so, you must
configure a voice VLAN ID on the port to which the VoIP phone is connected. The software stores
the voice VLAN ID in the port database for retrieval by the VoIP phone.
The dynamic configuration of a VoIP phone works in conjunction with the VoiP phone discovery
process. Upon installation, and sometimes periodically, a VoIP phone will query the Dell
PowerConnect device for VoIP information and will advertise information about itself, such as,
device ID, port ID, and platform. When the Dell PowerConnect device receives the VoIP phone
query, it sends the voice VLAN ID in a reply packet back to the VoIP phone. The VoIP phone then
configures itself within the voice VLAN.
As long as the port to which the VoIP phone is connected has a voice VLAN ID, the phone will
configure itself into that voice VLAN. If you change the voice VLAN ID, the software will immediately
send the new ID to the VoIP phone, and the VoIP phone will re-configure itself with the new voice
VLAN.
Configuration notes
• This feature works with any VoIP phone that:
- Runs CDP
- Sends a VoIP VLAN query message
- Can configure its voice VLAN after receiving the VoIP VLAN reply
• Automatic configuration of a VoIP phone will not work if one of the following applies:
- You do not configure a voice VLAN ID for a port with a VoIP phone
- You remove the configured voice VLAN ID from a port without configuring a new one
- You remove the port from the voice VLAN
• Make sure the port is able to intercept CDP packets (cdp run command).
• Some VoIP phones may require a reboot after configuring or re-configuring a voice VLAN ID.
For example, if your VoIP phone queries for VLAN information only once upon boot up, you must
reboot the VoIP phone before it can accept the VLAN configuration.
• Dell PowerConnect devices do not currently support Cisco 7970 VOIP phones.