ProCurve 2610-PWR Technical Information download pdf (Page 264)

IP Routing Features

Overview of IP Routing

■ If the cache contains an entry with the destination IP address, the device

uses the information in the entry to forward the packet out the ports listed

in the entry. The destination IP address is the address of the packet’s final

destination. The port numbers are the ports through which the destination

can be reached.

■ If the cache does not contain an entry, the software can create an entry

in the forwarding cache.

Each entry in the IP forwarding cache has an age timer. If the entry remains

unused for five minutes, the software removes the entry. The age timer is not

configurable.

Note You cannot add static entries to the IP forwarding cache.

IP Global Parameters for Routing Switches

The following table lists the IP global parameters and the page where you can

find more information about each parameter.

Table 7-1. IP Global Parameters for Routing Switches

Parameter Description Default See page

Address

Resolution

Protocol (ARP)

A standard IP mechanism that routers use to learn the Media Access

Control (MAC) address of a device 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.

Enabled 7-8

ARP age The amount of time the device keeps a MAC address 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.

20 minutes 7-10

Proxy ARP An IP mechanism a router can use to answer an ARP request on behalf

of a host. It replies with the router’s own MAC address instead of the

host’s.

Disabled 7-12

Time to Live

(TTL)

The maximum number of routers (hops) through 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.

64 hops 7-11

Directed

broadcast

forwarding

A directed broadcast is a packet containing all ones (or in some cases,

all zeros) in the host portion of the destination IP address. When a router

forwards such a broadcast, it sends a copy of the packet out each of its

enabled IP interfaces.

Note: You also can enable or disable this parameter on an individual

interface basis. See table 7-2 on page 7-7.

Disabled 7-13

7-6

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