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David.C 08-21-2009 01:29 AM

How to set an interface as the OSPF DR?
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Configure SW1 to be the OSPF DR in the respective LAN .

David.C 08-21-2009 01:33 AM

Re: OSPF DR Election
Knowledge Points:
In the multi-access network environment, OSPF elects DR and BDR based on
  • The OSPF interface priority
(config-if)#ip ospf priority [0-255]
The router with the highest priority will be the DR. If the value sets to 0, this interface will never be DR.
  • If the interfaces are with the same priority, the router with the highest Router-ID will be selected as DR.
In this case, lower R1 and R6's interface priority and increase SW1ís interface priority to make SW1 be the DR.

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