Brocade ICX 6650 Layer 3 Routing Configuration Guide 13
53-1002603-01
Basic IP parameters and defaults – Layer 3 Switches
Static ARP
entries
An ARP entry you place in the static ARP table. Static
entries do not age out.
No entries page39
Time to Live
(TTL)
The maximum number of routers (hops) through
which a packet can pass before being discarded.
Each router decreases a packet 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 page41
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.
Refer to Table 3 on page15.
Disabled page41
Directed
broadcast
mode
The packet format the router treats as a directed
broadcast. The following formats can be directed
broadcast:
•All ones in the host portion of the packet
destination address.
•All zeroes in the host portion of the packet
destination address.
All ones
NOTE: If you enable
all-zeroes
directed
broadcasts,
all-ones directed
broadcasts
remain enabled.
page42
Source-routed
packet
forwarding
A source-routed packet contains a list of IP
addresses through which the packet must pass to
reach its destination.
Enabled page41
Internet Control
Message
Protocol (ICMP)
messages
The Brocade Layer 3 Switch can send the following
types of ICMP messages:
•Echo messages (ping messages)
•Destination Unreachable messages
Enabled page43
ICMP Router
Discovery
Protocol (IRDP)
An IP protocol a router can use to advertise the IP
addresses of its router interfaces to directly
attached hosts. You can enable or disable the
protocol, and change the following protocol
parameters:
•Forwarding method (broadcast or multicast)
•Hold time
•Maximum advertisement interval
•Minimum advertisement interval
•Router preference level
NOTE: You also can enable or disable IRDP and
configure the parameters on an individual
interface basis. Refer to Table 3 on page 15.
Disabled page58
Reverse ARP
(RARP)
An IP mechanism a host can use to request an IP
address from a directly attached router when the
host boots.
Enabled page61
TABLE 2 IP global parameters – Layer 3 Switches (Continued)
Parameter Description Default For more
information