RIP 123
Before RIP completely deletes an unreachable route from the routing table, it
advertises the route by sending four update packets with a route metric of 16, to
let all the neighbors know that the route is unreachable. Routes do not always
become unreachable when a new period starts so the actual value of the
garbage-collection timer is 3 to 4 times of that of the period update timer.
You must consider network performance when adjusting RIP timers, and configure
all the routes that are running RIP, so as to avoid unnecessary traffic or network
oscillation.
Configuring RIP-1 Zero Field Check of the Interface Packet
According to the RFC1058, some fields in the RIP-1 packet must be 0. When an
interface version is set to RIP-1, the zero field check must be performed on the
packet. If the value in the zero field is not zero, processing is refused. There are no
zero fields in RIP-2 packets so configuring a zero field check is invalid for RIP-2.
Perform the following configurations in RIP View.
Specifying the Operating State of the Interface
In the Interface View, you can specify whether RIP update packets are sent and
received on the interface. In addition, you can specify whether an interface sends
or receives RIP update packets.
Perform the following configuration in Interface View:
The undo rip work command and the undo network command have similar but
not the same functions. The
undo rip work command allows other interfaces to
forward the route of the interface applying this command. The
undo network
command prevents other interfaces from forwarding the route of the interface
applying this command, and it appears that this interface has been removed.
In addition, the rip work command is functionally equivalent to both the rip
input
and rip output commands.
By default, all interfaces except loopback interfaces both receive and transmit RIP
update packets.
Tab le 117 Configuring Zero Field Check of the Interface Packets
Operation Command
Configure zero field check on the RIP-1 packet checkzero
Disable zero field check on the RIP-1 packet undo checkzero
Tab le 118 Specifying the Operating State of the Interface
Operation Command
Enable the interface to run RIP rip work
Disable the interface from running RIP undo rip work
Enable the interface to receive RIP update packets rip input
Disable the interface from receiving RIP update packets undo rip input
Enable the interface to send RIP update packets rip output
Disable the interface from sending RIP update packets undo rip output
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