Virtual link aggregation of network traffic in an aggregation switch

摘要

Access switches in a switching system may use virtual aggregated links. When a link between an aggregation switch and an access switch fails, the link failure may be reflected in the virtual aggregated link and data traffic to another access switch may be switched away from the failed switch. A forwarding table in the access switch stores a number of entries that each define a correspondence between destination addresses and an output identifier for the switch. At least a first output identifier includes an aggregated link that represents a first set of possible output links. At least a second output identifier includes a virtual aggregated link, associated with a second network switch that represents a second set of possible output links. Destination addresses in the forwarding table for the virtual aggregated link correspond to network devices connected to the second network switch.

主权项

1. A method comprising:
determining, by a first device, that information regarding a virtual aggregated link, that represents a plurality of possible output links associated with a second device, is not received; determining, by the first device and after determining that the information regarding the virtual aggregated link is not received, that information regarding a failed link between the second device and a third device is received; selecting, by the first device and after determining that the information regarding the failed link is received, particular links of the plurality of possible output links based on the information regarding the failed link between the second device and the third device,
the particular links connecting the first device to the third device; and updating, by the first device, membership information of the virtual aggregated link to remove the particular links from the virtual aggregated link.