Disabling The Removal Of Address And Control Bytes; Disabling The Transmission Of Redirect Messages On An Interface - Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual

JUNOS 10.1 Network Interfaces Configuration Guide
If you increase the size of the protocol MTU, you must ensure that the size of the
media MTU is equal to or greater than the sum of the protocol MTU and the
encapsulation overhead. For a list of encapsulation overhead values, see Table 18
on page 116. If you reduce the media MTU size, but there are already one or more
address families configured and active on the interface, you must also reduce the
protocol MTU size. (You configure the media MTU by including the
at the
the Media MTU" on page 110.)
NOTE: Changing the media MTU or protocol MTU causes an interface to be deleted
and added again.
The maximum number of data-link connection identifiers (DLCIs) is determined by
the MTU on the interface. If you have keepalives enabled, the maximum number of
DLCIs is 1000, with the MTU set to 5012.
The actual frames transmitted also contain cyclic redundancy check (CRC) bits, which
are not part of the MTU. For example, the default protocol MTU for a Gigabit Ethernet
interface is 1500 bytes, but the largest possible frame size is actually 1504 bytes;
you need to consider the extra bits in calculations of MTUs for interoperability.

Disabling the Removal of Address and Control Bytes

For Point-to-Point Protocol (PPP) CCC-encapsulated interfaces, the address and control
bytes are removed by default before the packet is encapsulated into a tunnel.
You can disable the removal of address and control bytes. To do this, include the
keep-address-and-control
You can include this statement at the following hierarchy levels:

Disabling the Transmission of Redirect Messages on an Interface

By default, the interface sends protocol redirect messages. To disable the sending of
these messages on an interface, include the
You can include this statement at the following hierarchy levels:
198
Disabling the Removal of Address and Control Bytes
[edit interfaces interface-name]
statement:
keep-address-and-control;
[edit interfaces interface-name unit logical-unit-number family ccc]
[edit logical-systems logical-system-name interfaces interface-name unit
logical-unit-number family ccc]
no-redirects;
[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]
hierarchy level, as discussed in "Configuring
statement:
no-redirects
statement
mtu