User's Manual

438
Users Manual of CS-6306R
The router sends the hello multiple-program broadcast packet on the interfaces where BEIGRP runs. Each
BEIGRP-supporting router receives these multiple-program broadcast packets. Therefore, all neighbors can
be found.
The Hello protocol uses two timers to detect the disappearance of neighbors. The hello interval specifies the
transmission frequency of the BEIGRP hello message on the interface of the router. hold timer specifies the
time to declare the neighbor is dead when the router cannot receives data from the designated neighbor. After
any type of the BEIGRP packet is received from the neighboring router, the value of hold timer needs to be
reset.
Different network types or network bandwidth adopt different default values of the hello timer.
Interface Type
Packaging
Hello Timer
(second)
Hold Timer
(second)
LAN Interface Any 5 15
In the Hello protocol, different default values of the timer may cause BEIGRP neighbors that connect the
same IP subnet to use different hello timers or hold timers. To prevent the problem from occurring, you need
to specify the hold timer in the hello packet of each router. Each BEIGRP router uses the hold timer specified
in the hello packet of the neighboring router to judge whether the neighbor times out. In this way,
trouble-detecting timers of different neighbors appears in one WAN topology. In special cases, the default
value of the timer cannot fulfill actual requirements. To modify the interval to send the hello message, run the
following command:
Command Purpose
ip beigrp hello-intervalseconds
Modifies the interval to send the hello
message on the interface.
To modify the timeout timer of the neighbor, run the following command:
Command Purpose
ip beigrp hold-timeseconds
Modifies the timeout time of the
neighbor.
45.2.3.8.2 Disabling the horizon split
The horizon split function is normally adopted. It prevents a received routing information from broadcasting
out from the same interface, avoiding route loop. In some cases, the horizon split function is not the best
choice, so you can run the following command to disable the horizon split function:
Command Purpose
no ip beigrp split-horizon
Disables the horizon split function.
45.2.3.9 Monitoring and Maintaining BEIGRP
Run the following command to clear the neighboring relationship.
Command Purpose
clear ip beigrp neighbors [ interface ]
Clear the neighboring relationship.