Concept and features of multi-protocol GMPLS

We all know the MPLS multi-label protocol technology. The GMPLS protocol technology is easy to understand. Now let's take a look at the technology. First, let's take a look at the introduction of this technology. Let's see where it is triggered.

1. Introduction to multi-protocol GMPLS

With the continuous improvement of modern management methods, people's concept of time efficiency has been constantly strengthened. In the past, only people could not hear their own communication methods, affecting the inter-interpersonal Multi-Protocol Label exchange MPLS) combining the label-based Layer 2 technology and layer-3 routing technology, a connection-oriented mechanism is introduced into a connectionless IP address, A short, fixed-length identifier called "tag" is used to forward a group.

It is the most successful technology that integrates IP and ATM. With the implementation of MPLS, users get better network performance and better control over the network. However, MPLS also has limitations in providing bandwidth in the physical network. With the development of DWDM and optical switching, the supplier has the ability to change the bandwidth capacity on a given link. MPLS does not rely on these features.

Therefore, if a user requests more bandwidth on a given link, no structure in MPLS can request this additional capacity to increase the bandwidth. Therefore, IETE defines the organization of the underlying Ethernet protocol) expands MPLS to mask non-IP devices to face this challenge, and proposes a general MPLS multi-protocol GMPLS ), also known as multi-protocol λ exchange.

Ii. Differences between GMPLS and MPLS protocols

Multi-Protocol GMPLS extends the MPLS protocol based on the necessary structure. It controls not only routers, but also DWDM systems, ADM and optical crossover. You can use multi-protocol GMPLS to dynamically provide resources and provide necessary redundancy for implementing multiple protection and recovery technologies. This is important because the multi-protocol GMPLS and MPLS are not network protocols.

Multi-Protocol GMPLS is a signaling protocol used by a user device to establish or cancel a circuit for the signal transmitted to another device. This is a world of difference from the network that must be artificially pinned by network users. In order to continue to develop on the basis of its IP address, multi-protocol GMPLS expands MPLS in several important ways.

These changes affect the basic LSP feature of the label exchange channel, that is, the tag request and tag communication, the one-way feature of the tag exchange channel, the propagation of errors, and the information used for synchronization between the start tag exchange channel and the final tag exchange channel in the channel. MPLS only processes multi-protocol GMPLS called the Group switching function psc) interface, while multi-protocol GMPLS adds four other types of interfaces.

Layer 2 exchange function interfaces can transmit data based on frame and element content; time division multiplexing (TDM) function interfaces can transmit data based on data time slots; the switching function interface works on an independent wavelength or band just like the optical crossover interface, while the optical switching function interface works on an independent optical fiber.

These devices establish a tag exchange channel just like the devices in MPLS. The label exchange channel may be an IP group stream that has been routed, but it is easy to establish like other types of connections. The tag switching channel is a synchronous optical network SONET circuit, which must start and end with a synchronous optical network circuit.

The establishment of a tag exchange channel involves the establishment of a tag exchange channel between all endpoints and the establishment of a request based on requirements. Data Streams of various data types on a link are rarely active, and a service only appears between several nodes, that is, the service is local, you can use this locality to establish a tag exchange channel based on requests to improve network scalability. Multi-Protocol GMPLS is used to establish a tag exchange channel based on requests.

These different label switching channels benefit from the typical nesting of MPLS. In MPLS, grouped streams are pooled into larger streams. The same basic principle applies here, that is, the label exchange channel is regarded as a virtual representation of the physical structure. Therefore, the tag switching channel for the low-level synchronous optical network circuit SONET must be nested in the high-level synchronous optical network circuit.

Similarly, the tag exchange channel running between optical switching cable interfaces FSC may include the switch function interface LSC, the tag exchange channel running between LSC may include the tag exchange channel running between TDM, followed by the L2 Switch interface L2SC), and finally the group exchange function interface PSC) the tag exchange channel between them.

In addition, GMPLS functions are similar to MPLS. Establish a tag exchange channel by sending a so-called PATH/LABEL request message by using a RSVP-TE or CR-LDP. The PATH/LABEL request message contains a common tag request, which is usually a specific routing object and a specific parameter used for special technologies. A common tag request is an additional part of GMPLS.

It specifies the encoding type of the tag exchange channel and the Net Load type of the tag exchange channel. The encoding type indicates the technical type to consider, such as so net or GBIT Ethernet. The net load type of the label exchange channel indicates the information type carried by the Net Load of the label exchange channel.

Iii. Multi-Protocol GMPLS conclusion

Many challenges brought by current routing solutions have led to the efforts of data network equipment vendors to develop MPLS to merge optical networks and data networks. However, GMPLS can be used to extend MPLS to non-IP network components, such as cross-connector and plug-in multiplexing, indicating that all devices can access network information equally, the integration of optical networks and data networks has great applicability for radio and television networks.