Alcatel-Lucent 7750 SR-OS, Configuration Manual

Page: 319 / 674

VRRP
7750 SR OS Router Configuration Guide Page 319
Host Unreachable Priority Event
The host unreachable priority event creates a continuous ping task that is used to test connectivity
to a remote host. The path to the remote host and the remote host itself must be capable and
configured to accept ICMP echo request and replies for the ping to be successful.
The ping task is controlled by interval and size parameters that define how often the ICMP request
messages are transmitted and the size of each message. A historical missing reply parameter
defines when the ping destination is considered unreachable.
When the host is unreachable, the host unreachable priority event is considered true or set. When
the host is reachable, the host unreachable priority event is considered false or cleared.
Route Unknown Priority Event
The route unknown priority event defines a task that monitors the existence of a given route prefix
in the system’s routing table.
The route monitoring task can be constrained by a condition that allows a prefix that is less
specific than the defined prefix to be considered as a match. The source protocol can be defined to
indicate the protocol the installed route must be populated from. To further define match criteria
when multiple instances of the route prefix exist, an optional next hop parameter can be defined.
202 Seven ports down Event State Set - 7 ports down Changed due to increase
Event Threshold 6 ports down
Hold Set Timer 5 seconds Set to hold-set due to threshold increase
206 All ports up Event State Set - 7 ports down
Event Threshold 6 ports down
Hold Set Timer 1 second
207 All ports up Event State Cleared - All ports up
Event Threshold None Event cleared
Hold Set Timer Expired
Table 6: LAG Events (Continued)
Time LAG Port State Parameter State Comments