Installation and Getting Started Guide

IP Global Parameters – Routing Switches

Table 6.1 lists the IP global parameters for routing switches.

Table 6.1: IP Global Parameters – routing switches

 

Parameter

Description

Default

See page...

 

 

 

 

 

 

 

 

IP state

The Internet Protocol, version 4

Enabled

n/a

 

 

 

 

Note: You cannot

 

 

 

 

 

disable IP.

 

 

 

 

 

 

 

 

 

IP address and

Format for displaying an IP address and its network

Class-based

6-80

 

 

mask notation

mask information. You can enable one of the

Note: Changing this

 

 

 

 

following:

 

 

 

 

parameter affects the

 

 

 

 

 

 

 

 

 

• Class-based format; example: 192.168.1.1

display of IP

 

 

 

 

255.255.255.0

addresses, but you

 

 

 

 

• Classless Interdomain Routing (CIDR) format;

can enter addresses in

 

 

 

 

either format

 

 

 

 

example: 192.168.1.1/24

 

 

 

 

regardless of the

 

 

 

 

 

 

 

 

 

 

display setting.

 

 

 

 

 

 

 

 

 

Router ID

The value that routers use to identify themselves to

The lowest-numbered

6-25

 

 

 

other routers when exchanging route information.

IP address configured

 

 

 

 

OSPF and BGP4 use router IDs to identify routers.

on the lowest­

 

 

 

 

RIP does not use the router ID.

numbered virtual

 

 

 

 

 

routing interface (VE).

 

 

 

 

 

If no VE is configured,

 

 

 

 

 

then the lowest­

 

 

 

 

 

numbered IP address

 

 

 

 

 

configured on the

 

 

 

 

 

device.

 

 

 

 

 

 

 

 

 

Address

A standard IP mechanism that routers use to learn

Enabled

6-27

 

 

Resolution

the Media Access Control (MAC) address of a device

 

 

 

 

Protocol (ARP)

on the network. The router sends the IP address of a

 

 

 

 

 

device in the ARP request and receives the device’s

 

 

 

 

 

MAC address in an ARP reply.

 

 

 

 

 

 

 

 

 

 

ARP age

The amount of time the device keeps a MAC address

Ten minutes

6-28

 

 

 

learned through ARP in the device’s ARP cache. The

 

 

 

 

 

device resets the timer to zero each time the ARP

 

 

 

 

 

entry is refreshed and removes the entry if the timer

 

 

 

 

 

reaches the ARP age.

 

 

 

 

 

 

 

 

 

 

Proxy ARP

An IP mechanism a router can use to answer an ARP

Disabled

6-29

 

 

 

request on behalf of a host, by replying with the

 

 

 

 

 

router’s own MAC address instead of the host’s.

 

 

 

 

 

 

 

 

 

 

Static ARP

An ARP entry you place in the static ARP table.

No entries

6-29

 

 

entries

Static entries do not age out.

 

 

 

 

 

 

 

 

 

 

Time to Live

The maximum number of routers (hops) through

64 hops

6-32

 

 

(TTL)

which a packet can pass before being discarded.

 

 

 

 

 

Each router decreases a packet’s TTL by 1 before

 

 

 

 

 

forwarding the packet. If decreasing the TTL causes

 

 

 

 

 

the TTL to be 0, the router drops the packet instead of

 

 

 

 

 

forwarding it.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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