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<b>dn42 wiki / Mpls</b>

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            <p>mpls label switching is faster because it’s a divide and conquer search in an ordered list, compared to routing, which is a longest prefix match, which is a search in a netmask deep tree</p>

<p>and doing just label switching, especially with multiple labels, have consequences like</p>

<p>you can provide vpns, be that layer2 or layer3 on the same infra, we can source-route through arbitrary paths we want, and so on….</p>

<p>you can control visibility / reachability by route target export / imports, so you can hide various routes from specific endpoints, then they’ll become unreachable just for them, basically rendering packet filtering unnecesary</p>

<p>hiding service addresses (ip / mac) from the infra resulting in less resource needs: in the simplest mpls, you dont need bgp route table only where the packet enters the network</p>

<p>you can hide your core from traceroute by disabling ip ttl propagation</p>

<p>hints:</p>

<p>as being layer2.5 technology, you’ll need a tunnel which carry ethettype, like gre</p>

<p>inside the core you can do ldp, rsvp-te (strategic or auto-tunnel) or segment-routing</p>

<p>between two ases, you can enable ipv4/ipv6 labeled-unicast address family</p>

<p>to do inter-as-mpls-vpn on top of it, you can enable rr-to-rr, asbr-to-asbr or rr-to-asbr vpnv4/vpnv6/vpls/evpn peerings</p>

<p>more info at <a href="http://mpls.dn42/">http://mpls.dn42/</a> or at <a href="http://mp.ls/">http://mp.ls/</a></p>

<p><a href="/howto/mpls-bird2">How to run MPLS with bird2</a></p>

<p>participating networks:</p>

<p>nop-mnt</p>

<p>C4TG1RL5-MNT - 
<a href="https://git.lemonsh.moe/C4TG1RL5/dn42/src/branch/master/lab.rtr.famfo.catgirls.dn42/frr">frr configuration</a> 
<em>Please make sure you understand how to configure and use frr before you use anything from this configuration!</em></p>

<p>planned:</p>

<p>Fortless</p>


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