Router Priority And Cost - Dell S4820T Configuration Manual

When you configure the LSA throttle timers, syslog messages appear, indicating the interval times, as
shown below for the transmit timer (45000ms) and arrival timer (1000ms).
Mar 15 09:46:00: %STKUNIT0-M:CP %OSPF-4-LSA_BACKOFF: OSPF Process 10,Router lsa
id
2.2.2.2 router-id 2.2.2.2 is backed off to transmit after 45000ms
Mar 15 09:46:06: %STKUNIT0-M:CP %OSPF-4-LSA_BACKOFF: OSPF Process 10,Router lsa
id
3.3.3.3 rtrid 3.3.3.3 received before 1000ms time
NOTE: The sequence numbers are reset when previously cleared routes that are waiting for the LSA
throttle timer to expire are re-enabled.

Router Priority and Cost

Router priority and cost is the method the system uses to "rate" the routers.
For example, if not assigned, the system selects the router with the highest priority as the DR. The second
highest priority is the BDR.
• Priority is a numbered rating 0 to 255. The higher the number, the higher the priority.
• Cost is a numbered rating 1 to 65535. The higher the number, the greater the cost. The cost assigned
reflects the cost should the router fail. When a router fails and the cost is assessed, a new priority
number results.
Figure 97. Priority and Cost Examples
690
Open Shortest Path First (OSPFv2 and OSPFv3)