Method and apparatus for updating provider domain due to...

Details Method and apparatus for updating provider domain due to... Method and apparatus for updating provider domain due to...

2003-12-16

2011-10-04

Pham, Chi (Department: 2471)

Multiplex communications

Network configuration determination

Reexamination Certificate

active

08031630

ABSTRACT:
Customer virtual local area networks (C-VLANs) connecting multiple LAN segments are set up through a provider network (12). Provider edge bridges (PEs) are coupled to customer edge bridges (CEs) to provide a transparent link between LAN segments. To determine whether a backdoor link is used in the C-VLAN topology, PEs monitor MAC address from a predetermined time after a TCN is received to determine if there are contradictory addresses or new addresses relative to the existing MAC address tables (or forwarding databases) that are indicative of a backdoor link. If so, an unlearning message is sent to bridges in the provider domain. In another embodiment, CEs set a snoop bit to indicate which TCNs must be snooped.

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