HP 6120XG HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide - Page 55

ARP Age Timer, IP Routing Features, Parameter, Description, Default, See

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IP Routing Features Overview of IP Routing Parameter Time to Live (TTL) Description Default 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 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 3-2 on page 3-12. Disabled ICMP Router Discovery Protocol (IRDP) An IP protocol that a router can use to advertise the IP addresses of its router interfaces to directly attached hosts. You can enable or disable the protocol at the Global CLI Config level. You also can enable or disable IRDP and configure the following protocol parameters on an individual VLAN interface basis at the VLAN Interface CLI Config level. • Forwarding method (broadcast or multicast) • Hold time • Maximum advertisement interval • Minimum advertisement interval • Router preference level Disabled Static route An IP route you place in the IP route table. No entries Default network route The router uses the default network route if the IP route table does not contain a route to the destination. Enter an explicit default route (0.0.0.0 0.0.0.0 or 0.0.0.0/0) as a static route in the IP route table. None configured See page Refer to the chapter titled "Configuring IP Addressing" in the Management and Configuration Guide. 3-16 3-38 3-39 3-20 3-24 ARP Age Timer The ARP age is the amount of time the switch keeps a MAC address learned through ARP in the ARP cache. The switch resets the timer to zero each time the ARP entry is refreshed and removes the entry if the timer reaches the ARP age. 3-9

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IP Routing Features
Overview of IP Routing
Parameter
Description
Default
See page
Time to Live
The maximum number of routers (hops) through
64 hops
Refer to the
(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.
chapter titled
“Configuring IP
Addressing” in
the
Management
and Configuration
Guide
.
Directed
A directed broadcast is a packet containing all ones
Disabled
3-16
broadcast
(or in some cases, all zeros) in the host portion of the
forwarding
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 3-2 on
page 3-12.
ICMP Router
An IP protocol that a router can use to advertise the
Disabled
3-38
Discovery
IP addresses of its router interfaces to directly
Protocol
attached hosts. You can enable or disable the
(IRDP)
protocol at the Global CLI Config level.
You also can enable or disable IRDP and configure
the following protocol parameters on an individual
VLAN interface basis at the VLAN Interface CLI
Config level.
•
Forwarding method (broadcast or multicast)
•
Hold time
•
Maximum advertisement interval
•
Minimum advertisement interval
•
Router preference level
3-39
Static route
An IP route you place in the IP route table.
No entries
3-20
Default
The router uses the default network route if the IP
None configured
3-24
network
route table does not contain a route to the
route
destination. Enter an explicit default route (0.0.0.0
0.0.0.0 or 0.0.0.0/0) as a static route in the IP route
table.
ARP Age Timer
The ARP age is the amount of time the switch keeps a MAC address learned
through ARP in the ARP cache. The switch resets the timer to zero each time
the ARP entry is refreshed and removes the entry if the timer reaches the ARP
age.
3-9