摘要:
A loopback mechanism uses frame relay OAM loopback frames which eliminate the need for location identifiers and reduces overhead and complexity. The frames replace source and destination loopback location identifiers by a loopback indicator field, a send node count field and a return node count field. The originating node of the loopback procedure sets the number of intermediate frame relay nodes to be traversed. The intermediate frame relay nodes simply increment or decrement the node count, depending on the direction of the loopback frame.
摘要:
In one example, a network device receives a packet to be forwarded according to a label switching protocol, determines a service to be performed on the packet by a service network device, sends a label request message to the service network device, wherein the label request message indicates support for labels having a particular length, wherein the particular length is larger than twenty bits (e.g., forty bits), and wherein the label request message specifies the service to be performed on the packet, receives, in response to the label request message, a label mapping message defining a label of the particular length, appends the label to the packet to form a Multi-Protocol Label Switching (MPLS)-encapsulated packet, and forwards the MPLS-encapsulated packet according to the label switching protocol.
摘要:
In general, techniques are described for extending a path computation element (PCE) communication protocol (PCEP) to support messages that enable PCEs to actively modify Multi-Protocol Label Switching (MPLS) for Traffic Engineering Label Switched Paths (TE LSPs) in and across network domains. In one example, an LSP database of a router includes configuration data for one or more LSPs configured in the router and further includes LSP state information specifying a current state of all LSPs of the router. A path computation client (PCC) of a router establishes an extended PCEP session and synchronizes LSP state information to a stateful PCE using the extended PCEP session. Subsequently, the stateful PCE sends an LSP update request to the PCC in the extended PCEP session, wherein the LSP update request includes one or more updated parameters for the LSP. The PCC then re-signals the LSP through the network according to the updated parameters.
摘要:
A system and method are disclosed for processing a packet. Processing the packet comprises receiving the packet; translating the packet from a first protocol-specific format to a canonical packet format; translating the packet from the canonical packet format to a second protocol-specific format; and forwarding the packet.
摘要:
In a tiered system of networks capable of processing distributed hash table (DHT) Put and Get messages, if a sending network of a Put or Get is at a tier below a subject tier at which a subject network receiving the message is located, the message is forwarded to networks at tiers below the subject tier. On the other hand, if the sending network is at a tier equal to or above the subject tier, the message is forwarded to all networks in the system other than the sending network.
摘要:
In general, techniques are described for using routing information obtained by operation of network routing protocols to dynamically generate network and cost maps for an application-layer traffic optimization (ALTO) service. For example, an ALTO server of an autonomous system (AS) receives routing information from routers of the AS by listening for routing protocol updates outputted by the routers and uses the received topology information to dynamically generate a network map of PIDs that reflects a current topology of the AS and/or of the broader network that includes the AS. Additionally, the ALTO server dynamically calculates inter-PID costs using received routing information that reflects current link metrics. The ALTO server then assembles the inter-PID costs into a cost map that the ALTO server may provide, along with the network map, to clients of the ALTO service.
摘要:
Using the ALTO Service, networking applications can request through the ALTO protocol information about the underlying network topology from the ISP or Content Provider. The ALTO Service provides information such as network resource preferences with the goal of modifying network resource consumption patterns while maintaining or improving application performance. This document describes, in one example, an ALTO server that implements enhancements to the ALTO service to assign a PID-type attribute to each of a set of one or more PIDs each associated with a subset of one or more endpoints of a network, wherein a PID-type attribute specifies a type for the subset of endpoints associated with the PID. The ALTO server generates an ALTO network map that includes a PID entry to describe each of the PIDs, wherein each PID entry includes a PID-type field that stores the assigned PID-type attribute for the PID described by the PID entry.
摘要:
A system and method are disclosed for establishing a connection between a first endpoint participating in a first protocol and a second endpoint participating in a second protocol. Establishing a connection includes establishing a virtual service endpoint participating in the first protocol on a network device that is connected to the first endpoint and the second endpoint and forwarding to the second endpoint communication directed from the first endpoint to the virtual service endpoint.
摘要:
A node in an overlay network requests a ranked list of other nodes in the overlay network that can provide a desired piece of content or service to the requesting node. A separate node such as a router generates the ranked list using a routing algorithm, returning the list to the requesting node so that the requesting node may acquire the desired content or service from the nearest node in the overlay network.
摘要:
A method and system for mapping logical fabric ports to line ingress queues. The system provides for the mapping of line ingress queues to logical destination ports instead of to physical fabric ports. The association of ingress queues with logical destination ports enables a doubling of the switch port capacity that is available when redundancy is employed on all switch ports within the switching fabric. The method and system provides for the distributed broadcasting of mapping table updates. The system employs a multi-shelf switching fabric. Upon the active-standby switchover of a shelf line card, the shelf manager on the impacted shelf, broadcasts by means of a broadcast control cell (BCC), mapping table updates to the TM ASICs associated with each shelf in the shelf cluster. These updates include the current logical to physical port mappings of the logical and the physical ports located on the impacted shelf.