Configuring IP Routing (Layer 3)

advertisements. When a host attached to a multicast link starts up, it may multicast a router solicitation to ask for immediate advertisements, rather than waiting for the next periodic one to arrive.

If no advertisements arrive, the host may re-transmit the solicitation a small number of times, but then must stop sending more solicitations. Routers that subsequently start up, or were not discovered because of packet loss or temporary link partitioning, are eventually discovered by reception of their periodic (unsolicited) advertisements.

Enabling IRDP on an Interface

To enable IRDP on an interface:

1.In the IP Configuration section of the Web Agent window, click IRDP. The ICMP Router Discovery Protocol dialog box opens.

2.In the Select column, choose the interface on which to enable IRDP.

3.Use Table 7-33to enable parameters and enter necessary Internet addresses in the IRDP Interfaces dialog box.

Table 7-33.ICMP Router Discovery Protocol Parameters

Parameter

Definition

 

 

Select

Selects the interface to be configured.

 

 

Interface

Displays the IRDP interface.

 

 

Network Address

Displays the network IP address of the IRDP interface.

 

 

IRDP State

Select to enable or disable IRDP on the selected interface.

 

The default is Enable.

 

 

Preferences

Enter the preference of the address as a default router

 

address, relative to other router addresses on the same

 

subnet. The minimum value (80000000 hex) is used to

 

indicate that the address should not be used by neighboring

 

hosts as a default router address, even though it may be

 

advertised. The default is 0.

 

 

Adv. Address

Select an IP destination address used for multicast router

 

advertisements sent from the interface.

 

Options include:

 

•

Multicast - Used on any link where listening hosts

 

 

support IP multicast. The default is 224.0.0.1.

 

•

Broadcast - Used on any link where listening hosts

 

 

support IP unicast. The default is 255.255.255.255.

 

 

 

7-46

Cajun P550/P220 Switch Operation Guide