Specifications

Engineering Guidelines
194
Network Configuration Guidelines
Table 62 contains a list of guidelines for network configuration. In brief, these guidelines are
exactly that: guidelines. Because LANs are so diverse and equipment changes so quickly,
review the following recommendations to provide the best operating conditions. For more
information on the guidelines in the table below, click on the cross-reference link in the adjacent
column, if provided.
Also see “Network Configuration Specifics” on page 227.
Table 62: Network Configuration Guidelines
Guideline For more information
Use networks with VLANs (IEEE 802.1p/Q) with dual-port
phones.
“Network Priority Mechanisms” on page 209
“VMPS, CDP, and Location Change Indication
(E911)” on page 247
The network should be fully switched. “Hub network versus switched network” on
page 202
Where data devices (PC and voice devices) share the
infrastructure, use managed Layer 2 switches capable of
supporting VLAN operation.
The ports must allow for the interface speed to be configured
either manually or automatically. Automatic configuration is
the simplest and preferred operating mode.
“Port Settings” on page 249
“VLAN Membership Policy Server (VMPS)” on
page 253
“3300 IP Ports” on page 271
TOS/DSCP to COS conversion can provide additional priority
marking when PCs are used as voice devices.
“Network Priority Mechanisms” on page 209
“TOS-to-COS (IEEE 802.1p) mapping and
softphones” on page 217
Routers or Layer 3 switches must be available to connect
between VLANs.
“WAN layer 3 priority” on page 213
For E911 location support and phone movement detection,
enable Rapid Spanning Tree Protocol, Spanning Tree
Protocol, or Cisco Discovery Protocol at network access ports.
“Network Configuration” on page 129
“VMPS, CDP, and Location Change Indication
(E911)” on page 247
Where E911 and resilient controller connections are not
needed, Spanning Tree Protocol can be disabled at the
controller and phones.
“Network Configuration” on page 129
Consider operation in a Cisco environment where CDP is
available. This may affect, through the network, QoS settings.
Also consider operation if VMPS is available. CDP can also
provide location change (E911) information.
“VMPS, CDP, and Location Change Indication
(E911)” on page 247
For Access connections to an end device where a network
loop cannot exist, portfast settings may be used to minimize
network disconnections.
“VMPS, CDP, and Location Change Indication
(E911)” on page 247
See the 3300 ICP Resiliency guide for additional network port
and controller settings when RSTP/STP is enabled within the
network.
3300 ICP Resiliency Guidelines
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