Example System Overview

Last Updated : Jul 06, 2021 |
Prolog information
Metadata
Keywords:
  • IP Office Configuration: The table below details the configuration for IP Office. Additional configuration is not required by IP Office in support of 802.1 tagging.
    Option
    Value
    IP Address LAN1
    192.168.202.1
    IP Mask LAN1
    255.255.255.0
    IP Address LAN2
    192.168.43.1
    IP Mask LAN2
    255.255.255.0
    Router
    192.168.202.1
    Call Server
    192.168.202.1
  • IP Phone- Configuration: In the example below, the IP phone was configured with fixed IP addressing.
    Option
    Value
    IP Address
    192.168.202.50
    IP Mask
    255.255.255.0
    Router
    192.168.202.1
    Call Server
    192.168.202.1
    VLANID
    100
  • VLAN Switch Configuration: The table below summaries the HP configuration for ports and VLANs.
    Port
    VLAN 100 Voice
    VLAN 101 Data
    3
    Tagged
    Untagged
    5
    Untagged
    -
    6
    -
    Untagged
  • The PC –Configuration: Shown below is the IP configuration of the PC1; no option in support of 802.1p or 802.1q is enabled on the PC.
    Option
    Value
    IP Address
    192.168.43.22
    IP Mask
    255.255.255.0
    Router
    192.168.43.1

Summary

From the port on which the PC and IP phone reside, you can receive two types of Ethernet frame (that is sent from Phone or PC):
  • Tagged packets are sent by IP Phone.
  • Untagged packets are sent by PC.
When an untagged packet is sent by the PC attached to the IP Phone port, it will be propagated only to VLAN 101. This is because when we added the port 3 to VLAN 101 the Mode option was specified as untagged. While for the other VLAN (101) the option Tagged was selected for port 3 in VLAN 101. Tagged packets will thereby go to VLAN 100 while the untagged will go to 101.
When a packet originates from an IP Phone it is tagged. Since the option 'untagged' is selected for port 5 in VLAN 100, the 802.1 tag is removed before the switch forwards the packet to this port. Similarly, when an untagged packet is originated and sent by the IP Office, the switch will tag the packet before forwarding LAN port 3.
Related links
VPN Remote Phones