Configuring The Media Mtu - Juniper EX2200 Hardware Manual

Configuring the Media MTU

Copyright © 2015, Juniper Networks, Inc.
NOTE: We recommend that you be careful when setting this value. Any
interface bandwidth value that you configure using the
affects how the interface cost is calculated for a dynamic routing protocol,
such as OSPF. By default, the interface cost for a dynamic routing protocol
is calculated using the following formula:
cost = reference-bandwidth/bandwidth,
where bandwidth is the physical interface speed. However, if you specify a
value for bandwidth using the
calculate the interface cost, rather than the actual physical interface
bandwidth.
To configure the bandwidth value for a logical interface, include the
bandwidth rate;
You can include this statement at the following hierarchy levels:
[edit interfaces interface-name unit logical-unit-number]
[edit logical-systems logical-system-name interfaces interface-name unit
logical-unit-number]
is the peak rate, in bps or cps. You can specify a value in bits per second either as a
rate
complete decimal number or as a decimal number followed by the abbreviation
(1,000,000), or (1,000,000,000). You can also specify a value in cells per second
m g
by entering a decimal number followed by the abbreviation
per second are converted to bits per second using the formula 1 cps = 384 bps. The value
can be any positive integer. The
except multilink interfaces.
The media maximum transmission unit (MTU) is the largest data unit that can be
forwarded without fragmentation.
This topic contains the following sections:
Media MTU Overview on page 54
How to Configure the Media MTU on page 55
Encapsulation Overhead by Encapsulation Type on page 56
Media MTU Sizes by Interface Type for M5 and M7i Routers with CFEB, M10 and M10i
Routers with CFEB, and M20 and M40 Routers on page 57
Media MTU Sizes by Interface Type for M40e Routers on page 57
Media MTU Sizes by Interface Type for M160 Routers on page 59
Media MTU Sizes by Interface Type for M7i Routers with CFEB-E, M10i Routers with
CFEB-E, and M320 and M120 Routers on page 59
bandwidth statement, that value is used to
statement is valid for all logical interfaces,
bandwidth
Chapter 2: Configuration Tasks
statement
bandwidth
statement:
bandwidth
(1000),
k
c ; values expressed in cells
53