VRRP implementation principle and basic functions of an S series switch


S series switches (S1700 excluded) support the VRRP function. Virtual Router Redundancy Protocol (VRRP) integrates multiple routing devices into a virtual routing device, and the IP address of the virtual routing device is used as the default gateway address to communicate with external networks. When the gateway is faulty, VRRP can select a new gateway to transmit data traffic, ensuring network reliability.

The working process of VRRP is as follows:

1. The VRRP group selects a new master based on the priorities of devices. The master sends gratuitous ARP packets to notify the connected network devices or hosts of the virtual MAC address of the VRRP group, and forwards packets to the virtual IP address.

2. The master periodically sends VRRP Advertisement packets to all backup devices in the VRRP group to advertise its configurations (such as the priority) and operating status.

3. If the master is faulty, VRRP elects a new master from the VRRP group based on priorities.

4. After a VRRP master/backup switchover, the new master sends gratuitous ARP packets carrying the virtual MAC address and virtual IP address of the virtual router to update the MAC address entry on the connected host or device. The user traffic is then switched to the new master.

5. If the original master recovers and is the IP address owner (its priority is 255), it immediately switches to the Master state. If the original device has a priority less than 255, it will switch to the Backup state first, and recover its priority to the previously configured priority before the faulty occurs.

6. If a backup router's priority is higher than the master router's priority, VRRP determines whether to re-elect a new master, depending on the backup router's working mode (preemption or non-preemption).

Other related questions:
What is SNMP for S series switches
The Simple Network Management Protocol (SNMP) is a standard network management protocol widely used on TCP/IP networks. Devices function as agents and can be managed and monitored by the manager (NMS). A network administrator can query information, modify data, and locate faults on devices through SNMP, greatly improving work efficiency.

Configure basic ARP functions on S series switches
On S series switches (except S1700 switches), you can run the display arp all command to display ARP entries.

Basic principles and functions of disk media scans
Storage systems periodically read disks for a scan to detect potential faults. The scanned objects include member disks of a RAID group, hot spare disks, and free disks, ensuring that all disks in use are in good conditions. By default, the scan period is 30 days. In a scan period, all disks will be scanned. If a system has over 100 disks, you are advised to select a scan period of 60 days (modifiable) to reduce the impact on system performance.

SNMP configuration on S series switch
S series switches (except S1700 switches) support three SNMP versions: SNMPv1, SNMPv2c, and SNMPv3. SNMPv1 and SNMPv2c use community names for authentication, resulting in low security, whereas SNMPv3 uses authentication and encryption technologies to enhance security. The following uses SNMPv2c configuration as an example: [HUAWEI] snmp-agent //Enable SNMP. [HUAWEI] snmp-agent sys-info version v2c //Set the SNMP version to SNMPv2c. [HUAWEI] snmp-agent community write adminnms01 //Set the SNMP write community name. For common SNMP configuration information, see "Common SNMP Operations" in S1720&S2700&S3700&S5700&S6700&S7700&S9700 Series Switches Common Operation Guide. For typical SNMP configuration examples, see "Typical SNMP Configuration" in "Typical Network Management and Monitoring Configuration" of S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration Examples. Common configuration and typical configuration examples for S9300 and S12700 series switches are the same as those for Sx700 series switches. The Sx700 series switches are used as an example here.

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