Avoiding data traffic loss in an ethernet ring multihomed, in an active-standby manner, to a virtual private LAN service transport network
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United States of America Patent
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Feb 16, 2016
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app pub date -
Sep 14, 2012
filing date -
Sep 14, 2012
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Abstract
Data traffic loss in a an Ethernet Ring that is multihomed, in an active-standby manner, to a VPLS transport network (such as a Border Gateway Protocol (BGP) multihomed Ethernet Ring, an MC-LAG multihomed Ethernet Ring, or some other type of active-standby multihomed Ethernet Ring, etc.) (ring) is avoided. The exemplary multihomed ring running Ethernet Ring Protection (ERP) protocol includes a Ring Protection Link (RPL), a first node and a second node linked with a designated border router and a standby border router of the network, respectively. The data traffic loss in the multihomed ring is avoided by (i) receiving an indication that the link between the first node and the designated border router has failed; and (ii) invoking, responsive to the received indication, an ERP Media Access Control (MAC)-flush in the ring, even in the absence of a failed link in the ring and without activating the specified RPL. The ERP MAC-flush causes subsequent data packets from each of the plurality of nodes in the ring to be forwarded to the standby border router via the second node.
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