Figure 29 Functional Block Diagram Of The Unicast Routing Protocol Subsystem - Zte ZXR10 5900 Product Description

Figure 29 Functional Block Diagram of the Unicast Routing Protocol Subsystem

OSPF OSPF
Protocol Protocol
Module Module
4.3.3.6 Multicast Routing Sub-System
IP multicast routing technology enables effective point-to-multipoint data transmission
over an IP network. IP multicast can effectively reduce network bandwidth and reduce
network load, therefore IP multicast routing technology has found wide applications in
many aspects such as resource discovery, multimedia conference, data replication, real-
time data transmission, gaming and simulation. Multicast routing protocols can be
classified into intra-domain protocols and inter-domain protocols. Inter-domain protocols
include MBGP and MSDP, while intra-domain protocols include PIM-SM, PIM-DM, and
DVMRP. Intra-domain protocols can be further divided into two categories. One is sparse
multicast routing protocol, including PIM-SM. The other is dense multicast routing
protocols, including PIM-DM and DVMRP.
PIM-SM constructs a shared-tree for distributing multicast packets by using an explicit
join mechanism over a rendezvous point (RP). When certain conditions are met, the RP
can also switch over to the shortest path tree. In addition, PIM-SM is independent of
unicast routing protocol, since it performs RPF check by using unicast routing table,
rather than relying on a particular unicast routing protocol. PIM-SM is more suitable for a
wide-area multicast network where there are potential multicast group members at the
network end. In addition, PIM-SM allows the use of the SPT, so it reduces the network
delay as a result of rendezvous point used, and hence increases efficiency. Therefore,
PIM-SM is typically the best choice of the multicast routing protocol in a multicast
network domain.
Multicast Source Discovery Protocol (MSDP) module is based on TCP transmission
control protocol, to provide PIM-SM with other multicast source existence information
outside the PIM domain. The MSDP protocol is a mechanism that allows RPs in the
PIM-SM domains to share active source information. Each RP knows the receivers in its
own local domain. When a RP in a remote domain learn information about new active
source, they can send the information to the RPs in other domains. In this way, multicast
data packets can be forwarded between domains.
ZXR1059/52 series completely support PIM-SM and MSDP protocols, and can provide
complete multicast solutions.
4.3.3.7 Application Sub-System
The application subsystem corresponds to the three upper layers of the OSI reference
model. The applications include FTP, TFTP and TELNET, DHCP and NAT. In practice all
of them serve other software subsystems. FTP and TFTP serve the file system of the
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BGP BGP
Protocol Protocol
Module Module
Unicast Protocol Interaction Module Unicast Protocol Interaction Module
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ZXR10 5900 5200 Product Description
RIP RIP IS-IS IS-IS
Protocol Protocol Protocol Protocol
Module Module Module Module
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