Adjusting The Interval Between Hello Packets And The Hold Time; Disabling Split Horizon - Cisco Nexus 7000 Series Configuration Manual

Chapter 8 Configuring EIGRP
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .

Adjusting the Interval Between Hello Packets and the Hold Time

You can adjust the interval between Hello messages and the hold time.
By default, Hello messages are sent every 5 seconds. The hold time is advertised in Hello messages and
indicates to neighbors the length of time that they should consider the sender valid. The default hold time
is three times the hello interval, or 15 seconds.
To change the interval between hello packets, use the following command in interface configuration
mode:
Command
switch(config-if)# {ip | ipv6}
hello-interval eigrp instance-tag
seconds
Example:
switch(config-if)# ip hello-interval
eigrp Test1 30
On very congested and large networks, the default hold time might not be sufficient time for all routers
to receive hello packets from their neighbors. In this case, you might want to increase the hold time.
To change the hold time, use the following command in interface configuration mode:
Command
switch(config-if)# {ip | ipv6}
hold-time eigrp instance-tag seconds
Example:
switch(config-if)# ipv6 hold-time eigrp
Test1 30
Use the show ip eigrp interface detail command to verify timer configuration.

Disabling Split Horizon

You can use split horizon to block route information from being advertised by a router out of any
interface from which that information originated. Split horizon usually optimizes communications
among multiple routing devices, particularly when links are broken.
By default, split horizon is enabled on all interfaces.
To disable split horizon, use the following command in interface configuration mode:
OL-20002-02
Purpose
Configures the hello interval for an EIGRP routing
process. The instance tag can be any case-sensitive
alphanumeric string up to 20 characters. The range is
from 1 to 65535 seconds. The default is 5.
Purpose
Configures the hold time for an EIGRP routing process.
The instance tag can be any case-sensitive
alphanumeric string up to 20 characters. The range is
from 1 to 65535.
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
Configuring Advanced EIGRP
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