Cisco Systems ATA 186 Parameter and Bits, OpFlags, page, VLAN Setting, page, VLANSetting, Feature

Chapter 3 Configuring the Cisco ATA for MGCP

Specifying a Preconfigured VLAN ID or Disabling VLAN IP Encapsulation

Table 3-1 Parameters and Bits for Preconfiguring a VLAN ID

Parameter and Bits	Reference
OpFlags:	OpFlags, page 5-27
• Bit 4—Enable the use of user-specified voice VLAN ID.
• Bit 5—Disable VLAN encapsulation
• Bit 6—Disable CDP discovery.
VLANSetting:	VLAN Setting, page 5-11

•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

Table 3-2 VLAN-Related Features and Corresponding Configuration Parameters

				VLANSetting
	OpFlags Bit 4	OpFlags Bit 5	OpFlags Bit 6	Bits 18-29
Feature
Static VLAN	1	0	1	VLAN ID
CDP-acquired	0	0	0	N/A
VLAN
No VLAN	N/A	1	N/A	N/A
No CDP	N/A	N/A	1	N/A
No CDP and no	0	1	1	N/A
VLAN

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

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)

3-4 OL-4803-01