Github user remibergsma commented on the pull request:
https://github.com/apache/cloudstack/pull/1231#issuecomment-164163749
You can read the following from man keepalived.conf:
```
# arbitary unique number 0..255
# used to differentiate multiple instances of vrrpd
# running on the same NIC (and hence same socket).
virtual_router_id 51
```
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