Juniper Networks, Inc.

Cisco Technology, Inc.

Vikas Vidyalal Patel

Tapraj Singh

Sunesh Rustagi

Arijit Paul

Maruthi Kishore Tiruveedhula

Himanshu Agarwal

Suneel Kumar Pentala

Umamaheswararao Karyampudi

Swamy Sadashivaiah Renu Kananda

Babu Singarayan

Ajay Kumar Modi

Manoj Sharma

Gautam Venkataramanan

Saravanan Sampathkumar

Embodiments provide for mitigating priority flow control deadlock in stretch topologies by initializing a plurality of queues in a buffer of a leaf switch at a local cluster of a site having a plurality of clusters, wherein each queue of the plurality of queues corresponds to a respective one cluster of the plurality of clusters; receiving a pause command for no-drop traffic on the leaf switch, the pause command including an internal Class-of-Service (iCoS) identifier associated with a particular cluster of the plurality of cluster and a corresponding queue in the plurality of queues; and in response to determining, based on the iCoS identifier, that the pause command was received from a remote spine switch associated with a different cluster than the local cluster: forwarding the pause command to a local spine switch in the local cluster; and implementing the pause command on the corresponding queue in the buffer.

Mitigating priority flow control deadlock in stretch topologies

Techniques are described to provide split-horizon packet forwarding so as to ensure that packets from the customer network that are injected into the provider backbone bridging Ethernet Virtual Private Network (PBB-EVPN) by one of the provider edge (PE) devices of the multi-homed Ethernet segment are not forwarded back toward the customer network by a different PE device connected to the same multi-homed Ethernet segment. For example, a method may comprise receiving a packet via a core-facing interface of a first PE device, determining the Ethernet segment associated with the PE devices by a lookup operation based on keys of the packet; in response to determining the Ethernet segment, supplanting the core-facing interface of the first PE device with a virtual interface associated with the keys, and forwarding the packet to a second CE device without forwarding the received packet back to the Ethernet segment associated with the first PE device.

Split-horizon packet forwarding in a multi-home PBB-EVPN network

In one example, a method includes performing L2 learning of a C-MAC address included in a first L2 data message by a first provider edge (PE) router included in an Ethernet Segment of a Provider-Backbone Bridging Ethernet Virtual Private Network (PBB-EVPN); sending to a second PE router within the Ethernet Segment an L2 control message comprising the C-MAC address and a B-MAC address corresponding to the Ethernet Segment of the PBB-EVPN, wherein the L2 control message informs the second PE router of the reachability of the C-MAC address through the first PE router; receiving, by the first PE router and from the second PE router, a second L2 data message as unicast traffic destined for the C-MAC address; and forwarding the second L2 data message to the first CE router.

System for avoiding traffic flooding due to asymmetric MAC learning and achieving predictable convergence for PBB-EVPN active-active redundancy

In one example, a method includes configuring a first provider edge (PE) router of a Provider Backbone Bridging (PBB) Ethernet Virtual Private Network (EVPN) to join an Ethernet Segment in active-active mode with at least a second PE router that is operating as a designated forwarder for the Ethernet Segment; receiving, by the first PE router from a remote PE router and prior to the first PE router performing Media Access Control (MAC) learning of a customer-MAC (C-MAC) address that is reachable via a backbone-MAC (B-MAC) address associated with the Ethernet Segment, a network packet that includes the C-MAC address; and in response to determining that the C-MAC address has not been learned by the first PE router and the B-MAC address included in the network packet is associated with the Ethernet Segment, forwarding, by the first PE router, the network packet to a destination identified by the C-MAC address.

Traffic black holing avoidance and fast convergence for active-active PBB-EVPN redundancy

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San Jose, CA, United States of America

Vikas Vidyalal Patel