APRICOT 2011 - MPLS-based Metro Ethernet Networks v1.0
APRICOT 2011 - MPLS-based Metro Ethernet Networks v1.0
APRICOT 2011 - MPLS-based Metro Ethernet Networks v1.0
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Traditional <strong>Metro</strong> <strong>Ethernet</strong> <strong>Networks</strong><br />
Newer generations of STP (IEEE802.1q-2003 – Multiple STP aka 802.1s):<br />
Built on top of RSTP<br />
Added VLAN awareness:<br />
Introduces the capability for the existence of multiple STP instances within the<br />
same bridged network<br />
Allows the association of VLANs to STP instances, in order to provide a (relatively)<br />
small number of STP instances, instead of using an instance per VLAN.<br />
Different STP instances can have different topologies, which allows much better<br />
link utilisation<br />
BUT<br />
The stigma associated with past failures is hard to remove…<br />
The protocol is fairly complicated, compared to its much simpler predecessors<br />
44 | <strong>MPLS</strong>-<strong>based</strong> <strong>Metro</strong> <strong>Ethernet</strong> <strong>Networks</strong>, February <strong>2011</strong>
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