L3 redundancy.pdf - the Netgroup at Politecnico di Torino
L3 redundancy.pdf - the Netgroup at Politecnico di Torino
L3 redundancy.pdf - the Netgroup at Politecnico di Torino
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VRRP overview (2)• Minor <strong>di</strong>fferences• Packet encapsul<strong>at</strong>ed in IP, protocol type 112 (no longer in UDP)• Transmitted to multicast address 224.0.0.18• Different MAC addresses associ<strong>at</strong>ed to each group• TTL = 255• A VRRP router receiving a packet with <strong>the</strong> TTL not equal to 255must <strong>di</strong>scard <strong>the</strong> packet (only one possible hop)• Active/Standby Master/Backup• Hello Messages Advertisement messages• HSRP Group Virtual Router ID (VRID)• Some timers (see l<strong>at</strong>er)40
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