Limiting the number of dvmrp routes advertised, Changing the dvmrp route threshold – Dell POWEREDGE M1000E User Manual

Page 1135

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44-57

Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide

OL-13270-03

Chapter 44 Configuring IP Multicast Routing

Configuring Advanced DVMRP Interoperability Features

Configuring a DVMRP Summary Address, page 44-58

(optional)

Disabling DVMRP Autosummarization, page 44-60

(optional)

Adding a Metric Offset to the DVMRP Route, page 44-60

(optional)

Limiting the Number of DVMRP Routes Advertised

By default, only 7000 DVMRP routes are advertised over an interface enabled to run DVMRP (that is,
a DVMRP tunnel, an interface where a DVMRP neighbor has been discovered, or an interface
configured to run the ip dvmrp unicast-routing interface configuration command).

Beginning in privileged EXEC mode, follow these steps to change the DVMRP route limit. This
procedure is optional.

To configure no route limit, use the no ip dvmrp route-limit global configuration command.

Changing the DVMRP Route Threshold

By default, 10,000 DVMRP routes can be received per interface within a 1-minute interval. When that
rate is exceeded, a syslog message is issued, warning that there might be a route surge occurring. The
warning is typically used to quickly detect when devices have been misconfigured to inject a large
number of routes into the MBONE.

Beginning in privileged EXEC mode, follow these steps to change the threshold number of routes that
trigger the warning. This procedure is optional.

Command

Purpose

Step 1

configure terminal

Enter global configuration mode.

Step 2

ip dvmrp route-limit count

Change the number of DVMRP routes advertised over an interface
enabled for DVMRP.

This command prevents misconfigured ip dvmrp metric interface
configuration commands from causing massive route injection into the
MBONE.

By default, 7000 routes are advertised. The range is 0 to 4294967295.

Step 3

end

Return to privileged EXEC mode.

Step 4

show running-config

Verify your entries.

Step 5

copy running-config startup-config

(Optional) Save your entries in the configuration file.

Command

Purpose

Step 1

configure terminal

Enter global configuration mode.

Step 2

ip dvmrp routehog-notification
route-count

Configure the number of routes that trigger a syslog message.

The default is 10,000 routes. The range is 1 to 4294967295.

Step 3

end

Return to privileged EXEC mode.

Step 4

show running-config

Verify your entries.

Step 5

copy running-config startup-config

(Optional) Save your entries in the configuration file.

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