VRRP is a Layer 3 protocol. e-Trunk is a Layer 2 protocol
Eth-Trunk implements link reliability between single devices. However, if a device fails, Eth-Trunk fails to take effect.
To improve network reliability, carriers introduced device redundancy with master and backup devices. If the master device or primary link fails, the backup device can take over user services. In this situation, another device must be dual-homed to the master and backup devices, and inter-device link reliability must be ensured.
E-Trunk was introduced to meet the requirements. E-Trunk aggregates data links of multiple devices to form a link aggregation group (LAG). If a link or device fails, services are automatically switched to the other available links or devices in the E-Trunk, improving link and device-level reliability. For more details, please refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100109721&id=EN-US_CONCEPT_0172352196&lang=en

The Virtual Routing Redundancy Protocol (VRRP) combines several routing devices into a virtual routing device to implement active/standby backup of gateways and ensure reliable communication. As shown in the figure, switchA and Switch B form a VRRP group. In normal situations, SwitchA is the master device and is responsible for forwarding tasks, SwitchB is a backup device and does not forward services. If SwitchAw fails, SwitchB becomes the new master device and continues to forward data to hosts to implement gateway backup. For more details, please refer to https://support.huawei.com/enterprise/en/doc/EDOC1000088597

Overview of Layer 2 Redundancy Solutions:
STP - the oldest STP, only for backward compatibility. Do not use it if you don't need it. It is slow and does not guarantee the longest recovery time.
RSTP - the successor of STP. It still does not guarantee the longest recovery time, but it is usually quite fast. It is standardized by IEEE 802.1D, so it is supported by almost all manufacturers' products.
MST - an extended version of RSTP.
Link Aggregation - Standardized by IEEE
HIPER-Ring - Very fast and reliable ring redundancy, exclusive to Hirschmann and Siemens
MRP - Very fast and reliable ring redundancy, standardized by IEC
PRP - Lossless redundancy of parallel paths standardized by IEC, requiring special hardware
HSR - Requires lossless redundancy by using rings in both directions of IEC standardization, requiring special hardware
DLR - Uses lossless redundancy of rings standardized by IEC and driven by ***kwell, requiring special hardware
Layer 3 redundancy solution:
VRRP - Standardized by IETF (RFC)
HiVRRP - faster than VRRP, proprietary by Hirschmann, based on VRRP, faster.
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