Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 737)

Multi-Service IronWare Switching Configuration Guide 707
53-1003036-02
Basic IP parameters and defaults
19
Router ID The value that routers use to identify themselves to other
routers when exchanging route information. OSPF and
BGP4 use router IDs to identify routers. RIP does not use
the router ID. The IP address
configured on the
lowest-numbered
loopback interface.
If no loopback
interface is
configured, then the
lowest-numbered IP
address configured
on the device.
IP Maximum
Transmission
Unit (MTU) The maximum length an Ethernet packet can be without
being fragmented. 1500 bytes for
Ethernet II
encapsulation
1492 bytes for SNAP
encapsulation
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
ARP rate
limiting Lets you specify a maximum number of ARP packets the
device will accept each second. If the device receives
more ARP packets than you specify, the device drops
additional ARP packets for the remainder of the
one-second interval. Disabled
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.
NOTE: You also can change the ARP age on an individual
interface basis. Refer to Table 87 .
Ten minutes
Proxy ARP An IP mechanism a router can use to answer an ARP
request on behalf of a host, by replying with the router’s
own MAC address instead of the host’s. Disabled
Static ARP
entries An ARP entry you place in the static ARP table. Static
entries do not age out. No entries
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
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 87 .
Disabled
TABLE 86 IP global parameters (Continued)
Parameter Description Default