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IP Configuration Configuring IP

page 12-14 OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006

IP Configuration

IP is enabled on the switch by default and there are few options that can, or need to be, configured. This

section provides instructions for some basic IP configuration options.

Configuring the Router Primary Address

The router primary address is used by advanced routing protocols (e.g., OSPF) to identify the switch on

the network. It is also the address that is used to access the switch for management purposes.

Use the ip router primary-address command to configure the router primary address. Enter the

command, followed by the IP address. For example, to configure a router primary address of 172.22.2.115,

you would enter:

-> ip router primary-address 172.22.2.115

Configuring the Router ID

By default, the primary address of the router is used as the router ID. However, if a primary address has

not been configured, the router ID is used by OSPF to identify the switch on the network. The router ID

can be any 32-bit number.

Use the ip router router-id command to configure the router ID. Enter the command, followed by the IP

address. For example, to configure a router ID of 172.22.2.115, you would enter:

-> ip router router-id 172.22.2.115

Configuring the Time-to-Live (TTL) Value

The TTL value is the default value inserted into the TTL field of the IP header of datagrams originating

from the switch whenever a TTL value is not supplied by the transport layer protocol. The value is

measured in hops.

Use the ip default-ttl command to set the TTL value. Enter the command, followed by the TTL value. For

example, to set a TTL value of 75, you would enter:

-> ip default-ttl 75

The default hop count is 64. The valid range is 1 to 255. Use the show ip config command to display the

default TTL value.

IP-Directed Broadcasts

An IP directed broadcast is an IP datagram that has all zeroes or all 1 in the host portion of the destination

IP address. The packet is sent to the broadcast address of a subnet to which the sender is not directly

attached. Directed broadcasts are used in denial-of-service “smurf” attacks. In a smurf attack, a continu-

ous stream of ping requests is sent from a falsified source address to a directed broadcast address, result-

ing in a large stream of replies, which can overload the host of the source address. By default, the switch

drops directed broadcasts. Typically, directed broadcasts should not be enabled.

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