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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)
OL-4803-01
Chapter 3 Configuring the Cisco ATA for MGCP
Specifying a Preconfigured VLAN ID or Disabling VLAN IP Encapsulation
N/A indicates that the variable is not applicable to the feature and the setting of this varaible does not affect the feature.
Example
The following procedure shows you how to configure the OpFlags and VLANSetting parameters to allow
the Cisco ATA to use a user-specified VLAN ID. In this example, the voice VLAN ID is 115 (in decimal
format).
Step 1 Set bits 4-6 of the OpFlags parameter to 1, 0, and 1, respectively. This setting translates to the following
bitmap:
xxxx xxxx xxxx xxxx xxxx xxxx x101 xxxx
The remaining bits of the OpFlags parameter, using all default values, make up the following bitmap
representation:
0000 0000 0000 0000 0000 0000 0xxx 0010
Therefore, the resulting value of the OpFlags parameter becomes the following bitmap representation:
0000 0000 0000 0000 0000 0000 0101 0010
Table 3-1 Parameters and Bits for Preconfiguring a VLAN ID
Parameter and Bits Reference
OpFlags:
• Bit 4—Enable the use of user-specified voice VLAN ID.
• Bit 5—Disable VLAN encapsulation
• Bit 6—Disable CDP discovery.
OpFlags, page 5-27
VLANSetting:
• Bits 0-2—Specify VLAN CoS bit value (802.1P priority) for TCP
packets.
• Bits 3-5—Specify VLAN CoS bit value (802.1P priority) for
Voice IP packets
• Bits 18-29—User-specified 802.1Q VLAN ID
VLAN Setting, page 5-11
Table 3-2 VLAN-Related Features and Corresponding Configuration Parameters
OpFlags Bit 4 OpFlags Bit 5 OpFlags Bit 6
VLANSetting
Bits 18-29
Feature
Static VLAN101VLAN ID
CDP-acquired
VLAN
000N/A
No VLAN N/A 1 N/A N/A
No CDP N/A N/A 1 N/A
No CDP and no
VLAN
011N/A