| VRRP | https://en.wikipedia.org/wiki/Virtual_Router_Redundancy_Protocol |
|---|---|
A virtual router must use 00-00-5E-00-01-XX as its media access control (MAC) address. The last byte of the address (XX) is the virtual router identifier (VRID) | |
| using packets with multicast IP address 224.0.0.18 | |
| IP protocol number 112 |
| Master VRRP | |
|---|---|
| The router with preempt configured is the master.correct The highest primary address is preferred if the priority is the same | Preemption is off by default |
| Master Election | The higher priority is preferred. Tie: Highest primary IP@ |
| TTL = 256 ?????255 | Invalid VRRP ttl value receive Number of packets received whose IP time- to-live (TTL) value is not 255. |
| uses multicast IP 224.0.0.18 with a TTL of 255. | |
| default timer is 1 second |