Juniper Networks, Inc.

Deepak Ojha

Ramasamy Ramanathan

Ramanarayanan Ramakrishnan

Sri Sairam Goli

Apurva Mehta

John E Drake

Pankaj Shukla

Jagadish Grandhi

Sanjiv Doshi

Manoj Sharma

Shrinivasa Kini

In general, techniques are described for providing control plane messaging in an active-active (or all-active) configuration of a multi-homed EVPN environment. In some examples, the techniques include receiving a control plane message comprising at least one address that identifies that second PE network device. The techniques may include configuring, based at least in part on the control plane message, a forwarding plane of a first PE network device to identify network packets having respective destination addresses that match the at least one address. The techniques may include determining that at least one address of the network packet matches the at least one address that identifies the second PE network device. The techniques may include, responsive to the determination, skipping a decrement of the Time-To-Live (TTL) value of the network packet, and forwarding the network packet to the second PE network device.

Control plane messaging in all-active multi-homed ethernet virtual private networks

In general, techniques are described for using a light-weight protocol to synchronize layer two (L2) addresses that identify routable traffic to multiple L3 devices, such as PE routers, that cooperatively employ an active-active redundancy configuration using a multi-chassis LAG to provide an L2 network with redundant connectivity. In one example, a network device establishes a multi-chassis LAG with a peer network device to provide redundant connectivity to a layer three (L3) network. A synchronization module of the network device receives a synchronization message that specifies an L2 address of the peer network device. When the network device receives an L2 packet data unit (PDU) from the L2 network, a routing instance of the network device routes an L3 packet encapsulated therein when the PDU has an L2 destination address that matches the L2 address of the peer network device.

MAC address synchronization for multi-homing with multichassis link aggregation

The reliability of the connection of a client edge (CE) device to a core network may be improved using redundant provider edge (PE) devices. A first of the PE devices may monitor a connection to the core network, where the PE device acts as a root device in a set of devices that implement a spanning tree using a spanning tree protocol and where a second PE device in the set of devices additionally connects to the core network. The PE device may additionally detect failure of the connection of the PE device to the core network; and change, in response to the detected failure of the connection, a spanning tree protocol priority value of the device to a value having a lower priority than that of the second PE device.

Priority inversion with spanning tree protocol to trigger path switching

In general, techniques are described for enhanced learning in layer two (L2) networks. A first network device of the intermediate network comprising a control unit and an interface may implement these techniques. The control unit executes a loop-prevention protocol (LPP) that determines a bridge identifier associated with a second network device of the intermediate network, where the first and second network devices each couple to a first network. The LPP selects the second network device as a root bridge and detects a topology change that splits the first network into sub-networks. The interface then outputs a message to direct remaining network devices of the intermediate network to clear L2 address information learned when forwarding L2 communications. The message includes the bridge identifier determined by the loop-prevention protocol as the root bridge and directs these remaining network devices to clear only the L2 addresses learned from this bridge identifier.

Enhanced address learning in layer two computer networks

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Sunnyvale, CA, United States of America

Deepak Ojha