Figure 26 Functional Block Diagram Of L2 Subsystem - Zte ZXR10 5900 Product Description

4.3.1.3 L2 Sub-System
The L2 subsystem mainly performs configuration management on the data link layer
(management layer), L2 protocols processing (control layer), data forwarding (data layer
or service layer) etc. The module functions are illustrated in the following diagram.

Figure 26 Functional Block Diagram of L2 Subsystem

L2 Protocol Module L2 Protocol Module L2 Protocol Module
Management Module Management Module
L2 Switch L2 Switch
Module Module
4.3.1.4 L3 Sub-System
From the perspective of software hierarchy, the L3 subsystem consists of service control
layer and data forwarding layer, where the service control layer is composed of the
TCP/IP protocol stack and IP forwarding support subsystem. TCP/IP protocol support
includes basic protocols and routing protocols. The basic protocols are the fundamental
protocols in IPv4 protocol suite, which provide services to dynamic routing protocols,
network management and system monitoring. It is mainly consisted of IP, ARP, ICMP,
IGMP, TCP, UDP and Telnet protocol entities which provide fundamental services to the
upper layers. Routing protocols are used to generate dynamic routes, and they consist
of unicast routing protocols such as RIP, OSPF, and BGP, and multicast routing
protocols such as IGMP, PIM-SM, MSDP and MBGP. They also provide related upper-
layer protocols such as LDP, VRRP, and RSVP. The IP forwarding and support
subsystem is responsible for the add/remove and modification on the forwarding table
and related policies. It also performs establishment and maintenance of indexes, as well
as data interaction between the CPU and switch chipsets etc. The IP data forwarding
layer performs ingress / forwarding / egress via the switching chipsets, based on the
policy created by the IP service control layer, configuration rules or the routing table.
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STP STP
Port Port
Parameters Parameters
L2 L2
L2 Software Forwarding L2 Hardware Forwarding L2 Software Forwarding L2 Hardware Forwarding
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ZXR10 5900 5200 Product Description
LACP LACP GVRP GVRP
MAC MAC VLAN VLAN
IGMP IGMP
Snooping Snooping
Port Mirror Port Mirror
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