Cisco Systems 78-11741-02 manual Controlling the Nhrp Packet Rate, IPC-25

Configuring IP Addressing

Configuring Address Resolution Methods

If your Cisco hardware has a Virtual Interface Processor, version 2 adapter, you must perform the following task to change the sampling time. By default, the port adapter sends the traffic statistics to the Route Processor every 10 seconds. If you are using NHRP in dCEF switching mode, you must change this update rate to 5 seconds. To do so, use the following command in global configuration mode:

Command	Purpose
Router(config)# ip cef traffic-statistics [update-rate	Changes the rate at which the port adapter sends
seconds]	traffic statistics to the RP.

Applying the Rates to Specific Destinations

By default, all destinations are measured and monitored for NHRP triggering. However, you can choose to impose the triggering and teardown rates on certain destinations. To do so, use the following commands beginning in global configuration mode:

	Command	Purpose
Step 1
	Router(config)# access-listaccess-list-number {deny	Defines a standard or extended IP access list.
	permit} source [source-wildcard]
	or
	access-list access-list-number{deny permit}
	protocol source source-wildcard destination
	destination-wildcard [precedence precedence] [tos tos]
	[log]
Step 2
	Router(config)# interface type number	Enters interface configuration mode.
Step 3
	Router(interface config)# ip nhrp interest access-list	Assigns the access list created in Step 1 that
		determines which destinations are included in or
		excluded from the SVC triggering.

For an example of setting the load interval, see the section “Changing the Rate for Triggering SVCs Example” at the end of this chapter. For an example of applying rates to destinations, see the section “Applying NHRP Rates to Specific Destinations Example” at the end of this chapter.

Controlling the NHRP Packet Rate

By default, the maximum rate at which the software sends NHRP packets is 5 packets per 10 seconds. The software maintains a per- interface quota of NHRP packets (whether generated locally or forwarded) that can be sent. To change this maximum rate, use the following command in interface configuration mode:

Command	Purpose
Router(config-if)#ip nhrp max-send pkt-countevery interval	Changes the NHRP packet rate per interface.

Cisco IOS IP Configuration Guide

IPC-25