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NE40E V800R010C10SPC500 Feature Description - Network Reliability 01

This is NE40E V800R010C10SPC500 Feature Description - Network Reliability
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Single-Homing Access in a Multi-Node Backup Scenario

Single-Homing Access in a Multi-Node Backup Scenario

Dual-homing access may fail to be deployed in a multi-node backup scenario due to insufficient resources. If this problem occurs, single-homing access can be used. On the network shown in Figure 8-19, network traffic can be forwarded by either NE40E 1 or NE40E 2. If common single-homing access is used, NE40E 2 will discard User1's change-of-authorization (COA) or disconnect message (DM) and web authentication response messages upon receipt. This case causes User1's COA/DM and web authentications to fail. If the link between NE40E 1 and the network goes faulty, the preceding problem will also occur.

Figure 8-19 Common single homing

To resolve the preceding problem, configure user data virtual backup between NE40E 1 and NE40E 2. On the network shown in Figure 8-20, information about User1's identity is backed up on NE40E 2. The aggregation switch S1 is single-homed to NE40E 1. VRRP is deployed on the access side. One VRRP protection group is deployed for each pair of active and standby links. If the VRRP group is in the Master state, the access link can be accessed by users. If User1's COA/DM and web authentication response messages are randomly delivered to NE40E 2, user data virtual backup allows NE40E 2 to forward the response messages to NE40E 1. Additionally, if the link between NE40E 1 and the network goes faulty, NE40E 2 can also take over the traffic on the faulty link, preventing traffic interruption.

Figure 8-20 Single-homing access in a multi-node backup scenario

NOTE:

Single-homing access in a multi-node backup scenario can be implemented only after user data virtual backup is configured.

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Updated: 2019-01-03

Document ID: EDOC1100055045

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