Information Technology Reference
In-Depth Information
BW
min
is in kbps, and sum_of_delays is in 10s of microseconds. The bandwidth and delay
for an Ether net interface are 10 Mbp s and 1 m s, re s pec t ively.
The calculated EIGRP BW metric is
256 * 10
7
/BW = 256 * 10
7
/10,000
= 256 * 10,000
= 256,000
The calculated EIGRP delay metric is
256 * sum of delay = 256 * 1 ms
= 256 * 100 * 10 microseconds
= 25,600 (in 10s of microseconds)
Ta ble 1 0 -7 shows some default values for bandwidth and delay.
Ta b l e 1 0 -7
Default EIGRP Values for Bandwidth and Delay
Media Type
Delay
Bandwidth
Satellite
5120 (2 seconds)
5120 (500 Mbps)
Ethernet
25,600 (1 ms)
256,000 (10 Mbps)
T-1 (1.544 Mbps)
512,000 (20,000 ms)
1,657,856
64 kbps
512,000
40,000,000
56 kbps
512,000
45,714,176
The
metric weights
subcommand is used change EIGRP metric computation. You can
change the k values in the EIGRP composite metric formula to select which EIGRP met-
rics to use. The command to change the k values is the
metric weights
tos k1 k2 k3 k4 k5
subcommand under
router eigrp
n
. The
tos
value is always 0. You set the other arguments
to 1 or 0 to alter the composite metric. For example, if you want the EIGRP composite
metric to use all the parameters, the command is as follows:
router eigrp
n
metric weights 0 1 1 1 1 1
EIGRP Packet Types
EIGRP uses five packet types:
Hello:
EIGRP uses hello packets in the discovery of neighbors. They are multicast to
■
WA N l i n k s w i t h 1 . 5 4 4 M b p s s p e e d s o r l e s s ) .
