Open Shortest Path First (OSPF)
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Command Usage
Hello packets are used to inform other routers that the sending router is still
active. Setting the hello interval to a smaller value can reduce the delay in
detecting topological changes, but will increase routing traffic.
Example
ip ospf priority
This command sets the router priority used when determining the designated router
(DR) and backup designated router (BDR) for a network segment. Use the
no
form
to restore the default value.
Syntax
ip ospf priority
priority
no ip ospf priority
priority
- Sets the interface priority for this router. (Range: 0-255)
Command Mode
Interface Configuration (VLAN)
Default Setting
1
Command Usage
• A designated router (DR) and backup designated router (BDR) are elected for
each OSPF network segment based on Router Priority. The DR forms an
active adjacency to all other routers in the network segment to exchange
routing topology information. If for any reason the DR fails, the BDR takes
over this role.
• Set the priority to zero to prevent a router from being elected as a DR or BDR.
If set to any value other than zero, the router with the highest priority will
become the DR and the router with the next highest priority becomes the
BDR. If two or more routers are tied with the same highest priority, the router
with the higher ID will be elected.
• 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.
• Configure router priority for multi-access networks only and not for
point-to-point networks.
Example
Console(config)#interface vlan 1
Console(config-if)#ip ospf hello-interval 5
Console(config-if)#
Console(config)#interface vlan 1
Console(config-if)#ip ospf priority 5
Console(config-if)#
Summary of Contents for 8926EM
Page 6: ...ii ...
Page 34: ...Getting Started ...
Page 44: ...Introduction 1 10 1 ...
Page 62: ...Initial Configuration 2 18 2 ...
Page 64: ...Switch Management ...
Page 76: ...Configuring the Switch 3 12 3 ...
Page 118: ...Basic Management Tasks 4 42 4 ...
Page 164: ...User Authentication 6 28 6 ...
Page 176: ...Access Control Lists 7 12 7 ...
Page 284: ...Quality of Service 14 8 14 ...
Page 294: ...Multicast Filtering 15 10 15 ...
Page 300: ...Domain Name Service 16 6 16 ...
Page 310: ...Dynamic Host Configuration Protocol 17 10 17 ...
Page 320: ...Configuring Router Redundancy 18 10 18 ...
Page 344: ...IP Routing 19 24 19 ...
Page 356: ...Unicast Routing 20 12 20 Web Click Routing Protocol RIP Statistics Figure 20 5 RIP Statistics ...
Page 386: ...Unicast Routing 20 42 20 ...
Page 388: ...Command Line Interface ...
Page 400: ...Overview of the Command Line Interface 21 12 21 ...
Page 466: ...SNMP Commands 24 16 24 ...
Page 520: ...Access Control List Commands 26 18 26 ...
Page 546: ...Rate Limit Commands 30 2 30 ...
Page 612: ...VLAN Commands 34 24 34 ...
Page 626: ...Class of Service Commands 35 14 35 ...
Page 670: ...DHCP Commands 39 16 39 ...
Page 716: ...IP Interface Commands 41 36 41 ...
Page 768: ...IP Routing Commands 42 52 42 ...
Page 770: ...Appendices ...
Page 791: ......