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Configuration Guide - Reliability

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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Association Between VRRP and MSTP to Load Balance Layer 2 and Layer 3 Traffic

Association Between VRRP and MSTP to Load Balance Layer 2 and Layer 3 Traffic

Layer 2 and Layer 3 traffic may be generated when intranet users access the external network, for example, when Layer 2 and Layer 3 VPN users access the MPLS public network. To ensure reliable access, enterprise users require that multiple access links be available and back each other up on the access network. Meanwhile, Layer 2 and Layer 3 traffic can be load balanced to fully leverage network resources.

To meet the requirement, you can deploy VRRP on the gateway for Layer 3 traffic load balancing and configure redundant links and MSTP at Layer 2. This improves Layer 2 and Layer 3 access reliability. Load balancing can be implemented between the master and backup in a VRRP group, and between MSTP root bridge and secondary root bridge.

Figure 3-14 Association between VRRP and MSTP to load balance Layer 2 and Layer 3 traffic

In Figure 3-14, Layer 3 VPN users connect to SwitchA, and Layer 2 VPN users connect to SwitchB. VRRP is configured between SwitchE and SwitchF. SwitchE functions as the master, and SwitchF functions as the backup. MSTP is configured on SwitchA, SwitchB, SwitchC, and SwitchD. SwitchD functions as the root bridge, and SwitchC as the secondary root bridge. Generally, Layer 3 VPN traffic is forwarded through SwitchE, and Layer 2 VPN traffic is forwarded through SwitchF, improving network efficiency. If the link between SwitchE and SwitchC fails, Layer 3 VPN traffic is switched to SwitchF in the VRRP group. If the link between SwitchB and SwitchD fails, Layer 2 VPN traffic is forwarded through the link SwitchB -> SwitchC -> SwitchE. This ensures access reliability.

Updated: 2019-03-21

Document ID: EDOC1000166606

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