Ericsson ECN330, User Manual

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Configuring the ECN330-switch
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routing topology information. If for any reason the DR fails, the BDR
takes over this role.
• The router with the highest priority becomes the DR and the router
with the next highest priority becomes the BDR. If two or more
routers are set to the same priority, the router with the higher ID will
be elected. The priority can be set to zero to prevent a router from
being elected as a DR or BDR.
• If a DR already exists for an area when this interface comes up, the
new router will accept the current DR regardless of its own priority.
The DR will not change until the next time the election process is
initiated.
• Transmit Delay – Sets the estimated time to send a link-state update
packet over an interface. (Range: 1-65535 seconds; Default: 1)
• LSAs have their age incremented by a delay before transmission.
Consider both the transmission and propagation delays for an
interface when estimating this delay. Set the transmit delay
according to link speed, using larger values for lower-speed links.
• The transmit delay must be the same for all routers in an
autonomous system.
• On slow links, the router may send packets more quickly than
devices can receive them. To avoid this problem, use the transmit
delay to force the router to wait a specified interval between
transmissions.
• Retransmit Interval – Sets the time between resending link-state
advertisements. (Range: 1-65535 seconds; Default: 1)
• A router will resend an LSA to a neighbor if it receives no
acknowledgment. The retransmit interval should be set to a
conservative value that provides an adequate flow of routing
information, but does not produce unnecessary protocol traffic.
Note that this value should be larger for virtual links.
• Set this interval to a value that is greater than the round-trip delay
between any two routers on the attached network to avoid
unnecessary retransmissions.
• Hello Interval – Sets the interval between sending hello packets on an
interface. (Range: 1-65535 seconds; Default: 10)