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 />
Forwarding Mechanism:<br />
Dynamic learning methods used to build forwarding databases<br />
Data-plane process – there are no control-plane processes for discovering endpoint<br />
information<br />
In the worst case, ALL switches have forwarding databases that include ALL<br />
MAC addresses. This is true even for switches in the core of the network<br />
(Switch C in preceding example).<br />
Switches have limited resources for storing MAC addresses. This poses severe<br />
scaling issues in all parts of the network. VLAN-stacking does not help with this<br />
problem.<br />
On topology changes, forwarding databases are flushed and addresses need to be<br />
re-learned. While these addresses are re-learned, traffic to unknown destinations<br />
is flooded through the network, resulting in wasted bandwidth.<br />
38 | <strong>MPLS</strong>-<strong>based</strong> <strong>Metro</strong> <strong>Ethernet</strong> <strong>Networks</strong>, February <strong>2011</strong>
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