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<section id="l2bsa">
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<span id="id1"></span><h1>L2BSA<a class="headerlink" href="#l2bsa" title="Permalink to this headline"></a></h1>
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<p>Layer 2 Bitstream Access (L2BSA) refers to a scenario in which a service provider makes
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his access infrastructure available to other service providers. These are retail service
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providers who provide their Internet services. In Germany, this service is mandated by
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the Federal Network Agency (German: Bundesnetzagentur or BNetzA). This is the regulatory
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office for electricity, gas, telecommunications, post, and railway markets. It is a federal
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agency of the Federal Ministry for Economic Affairs and Energy located in Bonn, Germany.</p>
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<p>The definition of L2BSA service was defined by the so-called <a class="reference external" href="https://www.bundesnetzagentur.de/EN/Areas/Telecommunications/Companies/MarketRegulation/NGAForum/NGAForum_node.html">NGA Forum</a>.
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This is an advisory board founded in May 2010 by the Bundesnetzagentur for promoting dialogue
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between the Bundesnetzagentur, network operators, manufacturers, states, and local authorities
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on NGA rollout.</p>
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<p>The L2BSA specification defines two interfaces. The so called U interface (User Interface)
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at the customer location and the A10-NSP interface (A10 Network Service Provider) between
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the service provider networks. Those interface types were introduced in the Broadband Forum
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TR-101 (Migration to Ethernet-Based Broadband Aggregation).</p>
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<img alt="L2BSA Interfaces" src="../_images/bbl_l2bsa_interfaces.png" />
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<p>The U interface is defined as a transparent Layer 2 interface. This can be used with or without
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VLAN tags by the wholesale service providers. This means that some CPE will send their traffic
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untagged while another CPE is configured for tagged traffic. All those traffic needs to be forwarded
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between the U interface and the A10-NSP interface.</p>
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<p>The A10-NSP interface is defined as a link aggregation bundle interface with one or more interfaces
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and LACP enabled or disabled. All traffic on this interface is at least single tagged with the so-called
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S-VLAN tag which identifies the U interface. This limits the amount of L2BSA services to 4094 per A10-NSP
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interface caused by the usable VLAN range. So some providers need many A10-NSP interfaces if they need to
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address more than the 4094 services.</p>
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<p>The term A10 relates to the end-to-end ADSL network reference model depicted in the figure below.
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The Core Network reference model is a subset of the end-to-end architecture. It is composed of two
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functional blocks and three reference points. The Access Node and the Regional Broadband Network are
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the two functional blocks. U, V, and A10 are the three reference points.</p>
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<img alt="TR-025" src="../_images/tr-025.png" />
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<p>The mapping between the U interface and A10-NSP/S-VLAN is managed by the L2BSA service provider.
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These mappings may change triggered by re-provisioning actions (port up/down).</p>
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<p>Thus all PPPoE discovery, as well as DHCPv4/v6 packets, must be enriched with extra line identification
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headers (Agent-Remote-Id, Agent-Circuit-Id, Actual-Data-Rate, …) by the L2BSA service provider in the
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upstream direction (from U to A10-NSP interface). Those headers allow the wholesale provider to identify
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the actual U interface for traffic received on the A10-NSP interface. This functionality is referred to
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as the intermediate agent functionality.</p>
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<p>The BNG Blaster A10NSP interface emulates such a layer two provider interface. This interface type accepts
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all PPPoE sessions received to verify forwarding and PPPoE header enrichment.</p>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>It is also planned to emulate a lightweight DHCPv4 and DHCPv6 server
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to verify IPoE forwarding and header enrichment.</p>
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</div>
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<p>Following a basic PPPoE/A10NSP configuration example which is
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detailed explained in the configuration section.</p>
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<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"interfaces"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"a10nsp"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
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<span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"interface"</span><span class="p">:</span><span class="w"> </span><span class="s2">"eth4"</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"qinq"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"mac"</span><span class="p">:</span><span class="w"> </span><span class="s2">"02:00:00:ff:ff:01"</span><span class="w"></span>
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<span class="w"> </span><span class="p">},</span><span class="w"></span>
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<span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"interface"</span><span class="p">:</span><span class="w"> </span><span class="s2">"eth5"</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"qinq"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"mac"</span><span class="p">:</span><span class="w"> </span><span class="s2">"02:00:00:ff:ff:01"</span><span class="w"></span>
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<span class="w"> </span><span class="p">}</span><span class="w"></span>
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<span class="w"> </span><span class="p">],</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"access"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
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<span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"__comment__"</span><span class="p">:</span><span class="w"> </span><span class="s2">"PPPoE"</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"interface"</span><span class="p">:</span><span class="w"> </span><span class="s2">"eth1"</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"pppoe"</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"outer-vlan-min"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"outer-vlan-max"</span><span class="p">:</span><span class="w"> </span><span class="mi">4000</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"inner-vlan"</span><span class="p">:</span><span class="w"> </span><span class="mi">7</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"stream-group-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="w"></span>
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<span class="w"> </span><span class="p">}</span><span class="w"></span>
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<span class="w"> </span><span class="p">]</span><span class="w"></span>
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<span class="w"> </span><span class="p">},</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"pppoe"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"reconnect"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"discovery-timeout"</span><span class="p">:</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"discovery-retry"</span><span class="p">:</span><span class="w"> </span><span class="mi">10</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"host-uniq"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"vlan-priority"</span><span class="p">:</span><span class="w"> </span><span class="mi">6</span><span class="w"></span>
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<span class="w"> </span><span class="p">},</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"dhcpv6"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"enable"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span><span class="w"></span>
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<span class="w"> </span><span class="p">},</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"session-traffic"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"autostart"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"ipv4-pps"</span><span class="p">:</span><span class="w"> </span><span class="mi">10</span><span class="w"></span>
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<span class="w"> </span><span class="p">},</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"streams"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
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<span class="w"> </span><span class="p">{</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"stream-group-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"name"</span><span class="p">:</span><span class="w"> </span><span class="s2">"PPPOE-S1"</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"ipv4"</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"direction"</span><span class="p">:</span><span class="w"> </span><span class="s2">"both"</span><span class="p">,</span><span class="w"></span>
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|
<span class="w"> </span><span class="nt">"priority"</span><span class="p">:</span><span class="w"> </span><span class="mi">128</span><span class="p">,</span><span class="w"></span>
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<span class="w"> </span><span class="nt">"length"</span><span class="p">:</span><span class="w"> </span><span class="mi">256</span><span class="p">,</span><span class="w"></span>
|
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<span class="w"> </span><span class="nt">"pps"</span><span class="p">:</span><span class="w"> </span><span class="mi">10</span><span class="p">,</span><span class="w"></span>
|
|
<span class="w"> </span><span class="nt">"a10nsp-interface"</span><span class="p">:</span><span class="w"> </span><span class="s2">"eth4"</span><span class="w"></span>
|
|
<span class="w"> </span><span class="p">},</span><span class="w"></span>
|
|
<span class="w"> </span><span class="p">{</span><span class="w"></span>
|
|
<span class="w"> </span><span class="nt">"stream-group-id"</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"></span>
|
|
<span class="w"> </span><span class="nt">"name"</span><span class="p">:</span><span class="w"> </span><span class="s2">"PPPOE-S2"</span><span class="p">,</span><span class="w"></span>
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|
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"ipv4"</span><span class="p">,</span><span class="w"></span>
|
|
<span class="w"> </span><span class="nt">"direction"</span><span class="p">:</span><span class="w"> </span><span class="s2">"both"</span><span class="p">,</span><span class="w"></span>
|
|
<span class="w"> </span><span class="nt">"priority"</span><span class="p">:</span><span class="w"> </span><span class="mi">128</span><span class="p">,</span><span class="w"></span>
|
|
<span class="w"> </span><span class="nt">"length"</span><span class="p">:</span><span class="w"> </span><span class="mi">256</span><span class="p">,</span><span class="w"></span>
|
|
<span class="w"> </span><span class="nt">"pps"</span><span class="p">:</span><span class="w"> </span><span class="mi">10</span><span class="p">,</span><span class="w"></span>
|
|
<span class="w"> </span><span class="nt">"a10nsp-interface"</span><span class="p">:</span><span class="w"> </span><span class="s2">"eth5"</span><span class="w"></span>
|
|
<span class="w"> </span><span class="p">}</span><span class="w"></span>
|
|
<span class="w"> </span><span class="p">]</span><span class="w"></span>
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<span class="p">}</span><span class="w"></span>
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</pre></div>
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</div>
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<p>You can define multiple interfaces with the same MAC
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address to emulate some static link aggregation (without LACP).</p>
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