Information Technology Reference
In-Depth Information
is shown as 255/255, and utilization at 0 percent is shown as 0/255. Example 10-1 shows
the load of a serial interface at 5/255 (1.9 percent).
Example 10-1
Interface Load
router3>
show interface serial 1
Serial1 is up, line protocol is up
Hardware is PQUICC Serial
Internet address is 10.100.1.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 5/255
Delay
The delay parameter refers to how long it takes to move a packet to the destination. Delay
depends on many factors, such as link bandwidth, utilization, port queues, and physical
distance traveled. Total delay is one of the five parameters included in the definition of the
EIGRP composite metric. By default, it is used to calculate the composite metric. You can
configure an interface's delay with the
delay
tens-of-microseconds
command, where
tens-of-microseconds
specifies the delay in tens of microseconds for an interface or net-
work segment. The interface delay can be checked with the
show interface
command. As
shown in Example 10-2, the interface's delay is 20,000 microseconds.
Example 10-2
Interface Delay
router3>
show interface serial 1
Serial1 is up, line protocol is up
Hardware is PQUICC Serial
Internet address is 10.100.1.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Reliability
The reliability parameter is the dependability of a network link. Some WAN links tend to
go up and down throughout the day. These links get a small reliability rating. Reliability is
measured by factors such as a link's expected received keepalives and the number of
packet drops and interface resets. If the ratio is high, the line is reliable. The best rating is
255/255, which is 100 percent reliability. Reliability is one of the five parameters included
in the definition of the EIGRP metric. By default, it is not used to calculate the composite
metric. As shown in Example 10-3, you can verify an interface's reliability using the
show
interface
command.
Example 10-3
Interface Reliability
router4#
show interface serial 0
Serial0 is up, line protocol is up
Hardware is PQUICC Serial
