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Description
Use the ospf timer hello command to configure the interval for transmitting Hello messages on an
interface.
Use the undo ospf timer hello command to restore the interval to the default.
By default, the Hello interval is
z 10 seconds for an interface of p2p or broadcast
z 30 seconds for an interface of p2mp or nbma
Hello packets are periodically sent to find and maintain neighbors and used for DR/BDR election. The
hello seconds value must be identical on interfaces attached to the same network segment. Otherwise,
neighbor relationships cannot be established between routers.
Related commands: ospf timer dead.
Examples
# Configure the interval of transmitting Hello messages on the interface VLAN-interface 10 to 20
seconds.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] interface Vlan-interface 10
[Sysname-Vlan-interface10] ospf timer hello 20
ospf timer poll
Syntax
ospf timer poll seconds
undo ospf timer poll
View
Interface view
Parameters
seconds: Poll Hello interval in seconds. It ranges from 1 to 65535.
Description
Use the ospf timer poll command to configure the poll interval at which the interface sends hello
packets to the neighbor in the Down state.
Use the undo ospf timer poll command to restore the default.
By default, the poll interval is 40 seconds.
On an NBMA network, if a neighbor becomes invalid, Hello packets will be transmitted at intervals of
poll seconds. You can configure the poll seconds to specify how often the interface transmits Hello
packets before it establishes neighbor relationship with the router. The poll interval should be no less
than 4 times the Hello interval.
Examples
# Configure to transmit poll Hello packet through interface VLAN-interface 20 every 130 seconds.
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