Alcatel-Lucent 7750 SR OS - Manual (Page 191)

VRRP
7750 SR OS Router Configuration Guide Page 191
VRRP Configuration Components
Figure 15 displays the major components to configure a VRRP priority control policy.
Figure 15: VRRP Policy Configuration Components
• Policy — A VRRP priority control policy can be used to modify the VRRP in-use priority
based on priority control events such as port-down , lag-port-down , host-
unreachable , and route-unknown parameters.
• Priority event — The context to configure VRRP priority control events used to define
criteria for modifying the VRRP in-use priority.
• Port down — Configure a port down priority control event that monitors the operational
state of a given port or SONET/SDH channel. When a port or channel enters an
operational down state, the event is considered set. When the port or channel enters an
operational up state, the event is considered cleared.
• LAG port down — Configures a Link Aggregation Group (LAG) priority control event
that monitors the operational state of the links in the LAG. The event monitors the
operational state of each port in the specified LAG. When one or more of the ports enter
the operational down state, the event is considered set. When all the ports enter an
operational up state, the event is considered clear.
• Host unreachable — Configures a host unreachable priority control event to monitor the
ability to receive ICMP echo reply packets from a given IP host address. A host
unreachable priority event creates a continuous ICMP echo request (ping) probe to the
specified IP address. During ping failure, the event is considered to be set. During ping
success, the event is considered to be cleared.
• Route unknown — Configures a route unknown priority control event that monitors the
existence of a specific active IP route prefix within the routing table. Route unknown
defines a link between the VRRP priority control policy and the Route Table Manager
(RTM). The RTM registers the specified route prefix as monitored by the policy. If any
change (add, delete, new next hop) occurs relative to the prefix, the policy is notified and
takes proper action according to the priority event definition.
Figure 16 displays the major components to configure a network interface VRRP instance.
VRRP
POLICY
PRIORITY-EVENT
PORT-DOWN
LAG-PORT-DOWN
HOST-UNREACHABLE
ROUTE-UNKNOWN