Alcatel-Lucent OmniAccess 700, Cli Configuration Manual

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Virtual Router Redundancy Protocol
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146
Beta Beta
CLI Configuration Guide
Alcatel-Lucent
W
HEN
T
RACK
I
NTERFACE
C
OMES
U
P
The following section details the process followed by the Master and Backup
routers when the track-interface comes up.
R
OUTER IN MASTER STATE
•
If the router is the address owner, then the router will set its operational priority to
255.
•
If the router is not the address owner, then the router will set its operational priority
to the configured priority.
R
OUTER IN
B
ACKUP
S
TATE
The router in backup state will take the following actions when the track interface
comes up. The actions taken vary based on whether the router is the address
owner or not. This is explained in case (i) and case (ii) below:
Case (i): Router is Address Owner
If the router is the address owner and the priority is equal to track interface down
priority (implies that the router went to backup because the track interface went
down), it performs the following:
The router will take the following actions when the track interface comes up:
•
Cancels master down timer.
•
Sets the master down interval to skew time.
•
Sets the operational priority to 255.
•
Schedules the new master down timer.
The above action result in the router becoming the master.
Case (ii): Router is not the Address Owner:
The router will take the following action when it is not the address owner, and the
track interface comes up.
•
Sets the priority of the router to the configured value and stays as backup.
•
Any state changes that may need to happen will happen when the next
advertisement packet is received or when the master down timer fires.
E
NTERING
M
ASTER
S
TATE
The following actions are taken before entering the master state, when the track
interface is enabled:
•
If the track interface is down, the operation priority is set to the track interface
down priority (20).
•
The router will send an advertisement with priority 20.
•
The router will switch to backup state if a router with the next highest priority
overrides it. Else, the router will remain in master state to provide some minimal
set of services.