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IP Routing Features
Overview of IP Routing
Parameter
Description
Time to Live
The maximum number of routers (hops) through
(TTL)
which a packet can pass before being discarded.
Each router decreases a packet's TTL by 1 before
forwarding the packet.
the TTL to be 0, the router drops the packet instead
of forwarding it.
Directed
A directed broadcast is a packet containing all ones
broadcast
(or in some cases, all zeros) in the host portion of the
forwarding
destination IP address.
such a broadcast, it sends a copy of the packet out
each of its enabled IP interfaces.
Note
on an individual interface basis. See table 5-2 on
page 5-9.
ICMP Router
An IP protocol that a router can use to advertise the
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
Static route
An IP route you place in the IP route table.
The router uses the default network route if the IP
Default
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.
5-8
If de
creasing the TTL causes
Wh
en a router forwards
: You also can enable or disable this parameter
Default
See page
64 hops
Refer to the
chapter titled
"Configuring IP
Addressing" in
the Management
and Configuration
Guide.
Disabled
5-14
Disabled
5-74
5-75
No entries
5-17
None configured
5-21

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