Github user dsclose commented on the pull request:

    https://github.com/apache/cloudstack/pull/1519#issuecomment-215480948
  
    @ustcweizhou How would you recommend I separate this? I can imagine 
separating the issues broadly into two parts:
    
    1. **Routing tables and iptables rules should be properly configured for 
multiple public NICs.** This PR should allow all features to work on standalone 
virtual routers. To achieve this, we'd need commits 9ee1eb6, ad9d72f, 8db879e, 
788b1be and b19e8aa.
    2. **Public Interfaces should be down on backup RvRs.** This PR would also 
need to ensure that the transition to master restores the proper routing and 
tables and iptables rules. Therefore it would need commits d582358 and bf285e1.
    
    I'm reticent to do this because the first PR would not allow multiple 
subnets to work on RvR setups. Do you agree with this separation and if so how 
should it be handled?


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