(H3CGB0-370 High Performance Park Notes
Hierarchical network model: Access layer: 1. Provide users with network access interfaces; 2. Enrich a large number of interfaces; 3. Access security control; 4. Access rate control, policy-based classification, packet marking, etc.; 5. Less consideration is given to redundancy. Convergence layer: 1. Gather the data of the access layer, and control the data and information according to the strategy; 2. The necessary redundancy design; 3. The complex strategy configuration. Core layer: 1. Exchange the data from the aggregation layer as fast as possible; 2. Powerful data exchange capability; 3. Stable and reliable high-redundancy design; 4. Do not configure complex policies.
The advantages of the hierarchical network model: 1. Clear network structure; 2. Easy to design and maintain; 3. Enhanced network stability; 4. Enhanced network scalability.
The benefits of modular network architecture: 1. Determine the network, with clear boundaries and clear traffic types; 2. Easy to design and increase scalability; 3. Easy to add and delete modules to reduce complexity; 4. Integrity of design.
Small local area network: 1. The number of network hosts is small, but they are all in the same broadcast domain; 2. There are even multiple hosts in the same collision domain.
Medium-sized local area network: the use of virtual local area networks (isolation of broadcast domains), the use of Layer 3 switching (to solve the performance bottleneck of routing and forwarding).
Large local area network: a combination of multiple medium or small networks with a three-layer structure. The structure of the core layer: 1. Dual-machine main and standby interconnection; 2. Multi-machine ring network interconnection; 3. Multi-machine Full-Mesh. The structure of the aggregation layer: 1. Dual uplink; 2. Route backup. The structure of the access layer: 1. Single uplink; 2. Dual uplink; 3. Cross interconnection.
Typical three-level network structure: 1. Core aggregation route backup; 2. Dual-core; 3. Aggregation and access dual uplinks.
Single point of failure of the network: The single point of failure of star topology and tree topology may bring the whole network failure. Mesh network: 1. Multiple redundant links avoid the high risk of single point failure; 2. STP blocks redundant links to avoid the formation of loops. Ethernet ring network: 1. Multi-core ring links provide backup of core links; 2. Access dual uplinks to avoid the risk of single-point failure; 3. RRPP realizes efficient switching. Dual-homed network: 1. Dual-core and dual-uplink provide redundant backup; 2. SmartLink blocks redundant links to achieve millisecond-level switching of links. Layer 3 routing network: 1. The routing protocol implements the shortest path forwarding, and redundant links provide backup options; 2. ECMP provides load sharing. Gateway redundancy backup: 1. The edge gateway runs VRRP to provide active and standby backup of the gateway; 2. Multiple backup groups MSTP provide load sharing. IRF device-level backup: 1. IRF stacking implements device-level N 1 redundancy backup; 2. Distributed link aggregation implements link load sharing.
Network management and maintenance: 1. Unified network management: topology discovery, device management, and trap alarms; 2. Centralized management of logs; 3. Simplified management of cluster and stack usage; 4. Traffic mirroring, targeted monitoring, and problem location; 5. NTP service Unified time, orderly management of logs and traps.
MAC address table: [MACAddress]---[VLANID]---[Port]
The management process of VLAN inter-switch forwarding: (frames sent by the host are not tagged with vlan, and the incoming switch is marked with the port vlan tag, and it is removed when going out))
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