Two-Tier Vlags With Vrrp - Lenovo ThinkSystem NE2552E Application Manual

Two-tier vLAGs with VRRP

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vLAG Active‐Active VRRP makes the secondary vLAG switch route Layer 3
traffic, thus reducing routing latency. If it is used in a two‐tier vLAG environment,
there may be two VRRP master switches for one VRRP domain and their role will
constantly flap. To prevent such occurrences, there are two vLAG VRRP modes:
1. vLAG VRRP Active (Full Active‐Active) mode
In active mode, Layer 3 traffic is forwarded in all vLAG related VRRP domains.
To enable vLAG VRRP active mode on a switch, use the following command:
NE2552E(config)# vlag vrrp active
Note: This is the default vLAG VRRP mode.
2. vLAG VRRP Passive (Half Active‐Active) mode
In passive mode, Layer 3 traffic is forwarded in a vLAG related VRRP domain
only if either the switch or its peer virtual router is the VRRP master. To enable
vLAG VRRP passive mode on a switch, use the following command:
NE2552E(config)# no vlag vrrp active
To verify the currently configured vLAG VRRP mode you can use the following
command:
NE2552E(config)# show vlag vrrp
Chapter 11: Virtual Link Aggregation Groups
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