User`s guide

XSR User’s Guide 89
Chapter 5 IP Routing Protocols
Configuring IP
In the backup state, a VRRP router monitors the VR master to confirm it is
alive, does not respond to ARP requests or accept packets for the IP
address(es) associated with the VR, and discards packets destined for the
VR’s MAC address. If an advertisement is received that the priority equals 0,
then the VRRP router performs the following:
 Advertises that it is the master VR,
 Broadcasts an ARP message with the VR’s MAC address to all the IP
addresses associated with the VR’s IP address,
 Starts the advertisement timer,
 And transitions to the master state.
 If an advertisement is received that has a higher priority, or a higher
IP address (if the priority is the same), then the VRRP router discards
the advertisement and remains as the master VR.
In the master state, a VRRP router performs as follows:
 Responds to ARP requests or accepts packets for the IP address or
addresses associated with the VR,
 Does not accept packets address to the IP address associated with the
VR if it is not the owner of the IP address,
 Forwards packets destined for the VR’s MAC address.
If a shutdown event is received, the VRRP router advertises a 0 priority.
If an advertisement with a greater priority or higher IP address (if the priority
is the same) is received by the virtual master, it experiences the following:
 Transitions to a backup state
 Cancels the advertisement timer
If an advertisement is received with the priority lower than local priority, or
with a lower IP address if the priority is the same, then the VRRP router
discards the advertisement.