Comparison between multi-protocol GMPLS and MPLS

We all know some basic content of MPLS Multi-Protocol Label technology. Here we will mainly explain the multi-protocol GMPLS. In this case, we have analyzed the GMPLS and MPLS content to help you.

1. Introduction to multi-protocol GMPLS

With the continuous improvement of modern management methods, people's concept of time efficiency is constantly strengthened. In the past, only people could not hear their own communication methods, affecting the Multi-Protocol Label Switching (MPLS) between people) 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, MPLS has its limitations in providing bandwidth within the physical network. With the development of DWDM and optical switching, suppliers have the ability to change 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 expand the bandwidth. Therefore, IETE (which defines the organization of the underlying Ethernet protocol) mainly uses extended MPLS to mask non-IP devices to face this challenge, and puts forward the 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, which controls not only routers, there are also DWDM systems, ADM, and optical crossover systems. You can use multi-protocol GMPLS to dynamically provide resources, it also provides necessary redundancy to implement multiple protection and recovery technologies. This is important because the multi-protocol GMPLS is not a network protocol like MPLS ｡

Multi-Protocol GMPLS is a signaling protocol, the User device uses it to establish or cancel a circuit for the signal transmitted to another device. This is compared with the network that must be manually pinned by the network user today, 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 features, that is, the label request and label communication, the one-way characteristics of the label exchange channel, the propagation of errors, and the information used for synchronization between the start label exchange channel and the end label exchange channel in the channel. MPLS only processes multi-protocol GMPLS group switching function (psc) while multi-protocol GMPLS adds four other types of interfaces ｡

The second layer exchange function interface can transmit data based on the frame and element content; the time division multiplexing (TDM) function interface can transmit data based on the data time slot; the exchange function interface works on an independent wavelength or band just like the optical crossover interface, while the optical fiber switching function interface works on an independent optical fiber ｡

These devices establish a label exchange channel just like the devices in MPLS. The label exchange channel may be an IP group flow 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 originate from 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. There are very few data streams in the active state on a link, in addition, a service only appears between several nodes, that is, the service is local, this locality can be used to improve network scalability based on requests to establish a tag exchange channel. Multi-Protocol GMPLS is to establish a tag exchange channel based on the request ｡

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, only the label switching channel is regarded as a virtual representation of the physical structure. Therefore, the label switching channel indicating the low-level synchronous optical network circuit (SONET) must be nested into the high-level synchronous optical network circuit ｡

Similarly, a tag exchange channel running between optical switching cable interfaces (FSC) may contain a tag exchange channel running between switching function interfaces (LSC, the tag exchange channel running between LSC may include the tag exchange channel running between TDM, followed by the tag exchange channel between L2 switching interfaces (L2SC, finally, there is a tag exchange channel between the group exchange function interfaces (PSC ｡

In addition, GMPLS functions very similar to MPLS. Send so-called PATH/LABEL request messages by using RSVP-TE or CR-LDP, to establish a tag exchange channel. The PATH/LABEL request message contains a common tag request, which is usually a clear routing object and a specific parameter for special technology, 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 be considered, for example, the so net technology or GBIT Ethernet technology. 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 combine optical networks and data networks. GMPLS can be used to expand MPLS to non-IP network components, for example, crossover connectors and plug-in/plug-in musters indicate that all devices can perform the same access to network information and integrate optical networks and data networks, which has great applicability to radio/TV networks ｡