Ip Global Parameters For Routing Switches - HP ProCurve Series 4100GL Management And Configuration Manual

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Table 16-1. IP Global Parameters for Routing Switches
Parameter Description
Address A standard IP mechanism that routers use to learn the Media Access
Resolution Control (MAC) address of a device on the network. The router sends
Protocol (ARP) 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 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 request on behalf
of a host. It replies with the router's own MAC address instead of the
host's.
Time to Live The maximum number of routers (hops) through which a packet can
(TTL) 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.
Directed A directed broadcast is a packet containing all ones (or in some cases,
broadcast all zeros) in the host portion of the destination IP address. When a router
forwarding 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 16-2 on page 16-6.
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.
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.
IP Routing Features
Overview of IP Routing
Default See page
Enabled 16-7
20 minutes 16-9
Disabled 16-10
64 hops 7-11
Disabled 16-11
16-5