Cabletron Systems SmartSwitch manual Configuring Router Discovery, Monitoring IP Parameters

Chapter 6: IP Routing Configuration Guide

packets to be processed on the SSR even if directed broadcast is not enabled on the interface receiving the packet.

Similarly, the SSR installs flows to drop packets destined for the SSR for which service is not provided by the SSR. This prevents packets for unknown services from slowing the CPU. You can disable this behavior, causing these packets to be processed by the CPU.:

Disables the directed-	ip dos disable directed-broadcast-protection
broadcast-protection feature
of the SSR.
Disables the port-attack-	ip dos disable port-attack-protection
protection feature of the SSR.

Monitoring IP Parameters

The SSR provides display of IP statistics and configurations contained in the routing table. Information displayed provides routing and performance information.

To display IP information, enter the following command in Enable mode:

Show ARP table entries.	arp show all
Show IP interface configuration.	interface show ip
Show all TCP/UDP connections	ip show connections [no-lookup]
and services.
Show configuration of IP interfaces.	ip show interfaces [<interface-name>]
Show IP routing table information.	ip show routes
Show ARP entries in routing table.	ip show routes show-arps
Show DNS parameters.	system show dns

Configuring Router Discovery

The router discovery server on the SSR periodically sends out router advertisements to announce the existence of the SSR to other hosts. The router advertisements are multicast or broadcast to each interface on the SSR on which it is enabled and contain a list of the addresses on the interface and the preference of each address for use as a default route for the interface. A host can also send a router solicitation, to which the router discovery server on the SSR will respond with a unicast router advertisement.

On systems that support IP multicasting, router advertisements are sent to the ‘all-hosts’ multicast address 224.0.0.1 by default. You can specify that broadcast be used, even if IP multicasting is available. When router advertisements are sent to the all-hosts multicast

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