C
HAPTER
45
| IP Routing Commands
Open Shortest Path First (OSPFv2)
– 1067 –
DEFAULT SETTING
1
COMMAND USAGE
â—† 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.
â—† 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.
â—† If a DR already exists for a network segment 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.
â—† 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 priority 5
Console(config-if)#
ip ospf retransmit-
interval
This command specifies the time between resending link-state
advertisements (LSAs). Use the no form to restore the default value.
SYNTAX
ip ospf [ip-address] retransmit-interval seconds
no ip ospf [ip-address] retransmit-interval
ip-address - This parameter can be used to indicate a specific IP
address connected to the current interface. If not specified, the
command applies to all networks connected to the current interface.
seconds - Sets the interval at which LSAs are retransmitted from
this interface. (Range: 1-65535)
COMMAND MODE
Interface Configuration (VLAN)
DEFAULT SETTING
5 seconds
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