System information

Configuring Interfaces and TCP/IP Features

5-25

where:

A.B.C.D is the source IP address.

hostname is the Domain Name Server (DNS) hostname.

Managing the Router

Follow these sections to manage routing operations on the BSR:

• Enabling IP Source Routing

• IP Accounting

• Clearing Interface Counters

• Clearing IP Routes

• Clearing the ARP Cache

• Clearing DNS Entries

• Clearing IP Traffic

Enabling IP Source Routing

The BSR examines IP header options on every packet. It supports the IP header

options Strict Source Route, Loose Source Route, Record Route, and Time Stamp,

which are defined in RFC 791. If the software finds a packet with one of these options

enabled, it performs the appropriate action. If it finds a packet with an invalid option,

it sends an ICMP Parameter Problem message to the source of the packet and discards

the packet.

IP provides a provision that allows the source IP host to specify a route through the IP

network. This provision is known as source routing. Source routing is specified as an

option in the IP header. If source routing is specified, the software forwards the packet

according to the specified source route. This feature is employed when you want to

force a packet to take a certain route through the network. The default is to disable

source routing.

You can enable IP source-route header options if they have been disabled by using the

following command in Global Configuration mode: