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JUNOS 10.1 Network Interfaces Configuration Guide
If you change the size of the media MTU, you must ensure that the size is equal to
or greater than the sum of the protocol MTU and the encapsulation overhead.
NOTE: Changing the media MTU or protocol MTU causes an interface to be deleted
and added again.
You configure the protocol MTU by including the
hierarchy levels:
Because tunnel services interfaces are considered logical interfaces, you cannot
configure the MTU setting for the physical interface. This means you cannot include
the
following interface types: generic routing encapsulation (
link services (
configure the protocol MTU on tunnel interfaces, as described in "Setting the Protocol
MTU" on page 197.
Configuring Interface Encapsulation on Physical Interfaces
Point-to-Point Protocol (PPP) encapsulation is the default encapsulation type for
physical interfaces. You need not configure encapsulation for any physical interfaces
that support PPP encapsulation. If you do not configure encapsulation, PPP is used
by default. For physical interfaces that do not support PPP encapsulation, you must
configure an encapsulation to use for packets transmitted on the interface.
You can optionally configure an encapsulation on a logical interface, which is the
encapsulation used within certain packet types. For more information about logical
interface encapsulation, see "Configuring the Encapsulation on a Logical Interface"
on page 171.
This section contains the following topics:
Configuring the Encapsulation on a Physical Interface
By default, PPP is the encapsulation type for physical interfaces. To configure the
encapsulation on a physical interface, include the
[edit interfaces interface-name]
118
Configuring Interface Encapsulation on Physical Interfaces
[edit interfaces interface-name]
mtu bytes;
[edit interfaces interface-name unit logical-unit-number family family]
[edit logical-systems logical-system-name interfaces interface-name unit
logical-unit-number family family]
mtu
statement at the
[edit interfaces interface-name]
), multilink services (
ls-
Configuring the Encapsulation on a Physical Interface on page 118
Encapsulation Capabilities on page 122
[edit interfaces interface-name]
statement at the following
mtu
hierarchy level for the
gr-
), and multicast (
ml-
encapsulation
hierarchy level:
), IP-IP (
), loopback (
ip-
lo-
,
). You can, however,
pe-
pd-
statement at the
),
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