Proactive creation of multicast state in an overlay transport network to achieve fast convergence on failover

摘要

Techniques are provided for designating, in an overlay transport virtualization (OTV) network connected to a data center, an edge device to act as a backup authoritative edge device (BAED) for an authoritative edge device (AED) for multicast packet encapsulation and forwarding. Data traffic associated with a given virtual local area network (VLAN) may be detected from a multicast source in the data center addressed to recipients in a site group. A mapping may be generated between the site group and a core data group in the OTV network for traffic from the multicast source. Advertisements may be sent of the mapping to edge devices in another data center across the OTV network. A similar configuration is presented for a BAED for inbound multicast traffic to a data center.

主权项

1. A method comprising:
receiving a designation at an edge device connected to an overlay transport virtualization (OTV) network in a first data center to act as a failover backup authoritative edge device (BAED) for an authoritative edge device (AED) for multicast message encapsulation and forwarding; detecting traffic from a multicast source in the first data center destined for recipients in a site group, wherein the traffic is associated with a particular virtual local area network (VLAN); generating a mapping between the site group and a core group in the OTV network for the traffic from the multicast source; sending an advertisement of the mapping to one or more edge devices in a second data center across the OTV network, wherein the mapping is independent of a mapping generated by the BAED between the site group and a core group in the OTV network, and wherein both the AED and BAED separately send dummy packets to maintain multicast trees in the OTV network, and both the AED and BAED separately advertise respective mappings to edge devices; and receiving a multicast message from the multicast source and determining from an outgoing interface list (OIL) that the multicast message is to be transmitted via the OTV network.