Loop detection in a communications network
First Claim
Patent Images
1. A method comprising:
- transmitting, from a logical switch made up of at least two switching nodes, a test packet to a communications network;
receiving the test packet by at least one of the switching nodes in the logical switch;
determining whether the received test packet has a destination address that matches one or more predefined addresses associated with one of the two switching nodes, wherein determining whether the received test packet has the destination address that matches the one or more predefined addresses comprises determining whether the received test packet has the destination address that matches an address that individually identifies one of the switching nodes in the logical switch; and
indicating presence of a loop in the communications network in response to determining that the test packet has the destination address that matches the address that individually identifies one of the two switching nodes.
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Abstract
A first node includes ports and a controller to receive a test packet at a first one of the ports. The first node determines whether the received test packet has a destination address that matches one or more predefined addresses associated with a second node. Presence of a loop in a communications network in which the first and second nodes are located is indicated in response to detecting receipt of the test packet containing the matching destination address.
28 Citations
22 Claims
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1. A method comprising:
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transmitting, from a logical switch made up of at least two switching nodes, a test packet to a communications network; receiving the test packet by at least one of the switching nodes in the logical switch; determining whether the received test packet has a destination address that matches one or more predefined addresses associated with one of the two switching nodes, wherein determining whether the received test packet has the destination address that matches the one or more predefined addresses comprises determining whether the received test packet has the destination address that matches an address that individually identifies one of the switching nodes in the logical switch; and indicating presence of a loop in the communications network in response to determining that the test packet has the destination address that matches the address that individually identifies one of the two switching nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A first node comprising:
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ports; and a controller to; receive a test packet at a first one of the ports, wherein the received test packet was sent by the first node or a second node, wherein the first and second nodes are part of a logical switch; determine whether the received test packet has a destination address that matches one or more predefined addresses associated with the first node or the second node, wherein the destination address that matches the one or more predefined addresses is an address that individually identifies the first node or the second node; and indicate presence of a loop in a communications network in which the first and second nodes are located in response to detecting receipt of the test packet containing the destination address matching the address that individually identifies the first node or second node. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An article comprising at least one non-transitory storage medium containing instructions that when executed cause a first network node to:
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send a test packet to a communications network, wherein the test packet contains a source address that identifies the first network node and a destination address that identifies the first network node; receive the test packet from the communications network; determine whether the received test packet has a destination address that matches an address of the first network node; and indicate presence of a loop in the communications network in response to determining that the received test packet contains the destination address that matches the address of the first network node. - View Dependent Claims (21, 22)
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Specification