User Guide
Table Of Contents
- Cambium
- PMP 450 Planning Guide
- Accuracy
- Copyrights
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- High Risk Materials
- Safety and regulatory information
- Contents
- List of Figures
- List of Tables
- About This Planning Guide
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- Address:
- Chapter 1: Planning considerations
- Regulatory planning
- Network migration planning
- Site planning
- Link planning
- Analyzing the RF Environment
- Selecting Sites for Network Elements
- Diagramming Network Layouts
- Grounding and lightning protection
- Configuration options for TDD synchronization
- Data network planning
- Security planning
- Isolating APs from the Internet
- Managing module access by passwords
- Filtering protocols and ports
- Port Lockdown
- Isolating SMs
- Filtering management through Ethernet
- Allowing management from only specified IP addresses
- Configuring management IP by DHCP
- Planning for airlink security
- Planning for RF Telnet Access Control
- Forwarding Downlink PPPoE PADI packets
- Planning for RADIUS integration
- Planning for SNMP security
- Ordering components
- Chapter 2: Legal information
- Cambium Networks end user license agreement
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- Conditions of use
- Title and restrictions
- Confidentiality
- Right to use Cambium’s name
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- Term of license
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- Survival of provisions
- Entire agreement
- Third party software
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- Limit of liability
- Cambium Networks end user license agreement
- Chapter 3: Reference information
PMP 450 Planning Guide
VLAN settings can also cause the module to convert received non-VLAN packets into VLAN packets. In this
case, the 802.1p priority in packets leaving the module is set to the priority established by the DiffServ
configuration.
If you enable VLAN, immediately monitor traffic to ensure that the results are as desired. For example, high-
priority traffic may block low-priority.
Q-in-Q DVLAN (Double-VLAN) Tagging (802.1ad)
PMP modules can be configured with 802.1ad Q-in-Q DVLAN (Double-VLAN) tagging which is a way for an
operator to put an 802.1Q VLAN inside of an 802.1ad VLAN. A nested VLAN, which is the original 802.1Q
tag and a new second 802.1ad tag, allows for bridging of VLAN traffic across a network and segregates the
broadcast domains of 802.1Q VLANs. Q-in-Q can be used with PPPoE and/or NAT.
The 802.1ad standard defines the S-VLAN as the Service Provider VLAN and the C-VLAN as the customer
VLAN. The radio software does 2 layer Q-in-Q whereby the C-VLAN is the 802.1Q tag and the S-VLAN is the
second layer Q tag as shown in Table 56.
Table 56 Q-in-Q Ethernet frame
Ethernet Header
S-VLAN EthType
0x88a8
C-VLAN EthType
0x8100
IP Data EthType 0x0800
The 802.1ad S-VLAN is the outer VLAN that is configurable on the Configuration => VLAN web page of the
AP. The Q-in-Q EtherType parameter is configured with a default EtherType of 0x88a8 in addition to four
alternate EtherTypes that can be configured to aid in interoperability with existing networks that use a
different EtherType than the default.
The C-VLAN is the inner VLAN tag, which is the same as 802.1Q. As a top level concept, this operates on the
outermost tag at any given time, either “pushing” a tag on or “popping” a tag off. This means packets will at
most transition from an 802.1Q frame to an 801.ad frame (with a tag “pushed” on) or an untagged 802.1 frame
(with the tag “popped” off. Similarly, for an 802.1ad frame, this can only transition from an 802.1ad frame to
an 802.1Q frame (with the tag “popped” off) since the radio software only supports 2 levels of tags.
pmp-0047 (March 2014)
1-127