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This means not advertising the interface s transition until a certain period of time
has transpired.
When you have damped interface transitions and the interface goes from up to down,
the interface is not advertised to the rest of the system as being down until it has
remained down for the hold-time period. Similarly when an interface goes from
down to up, it is not advertised as being up until it has remained up for the hold-time
period.
To damp interface transitions, include the
interface-name]
The time can be a value from 0 through 65,534 milliseconds. The default value is 0,
which means that interface transitions are not damped. The JUNOS Software
advertises the transition within 100 milliseconds of the time value you specify.
Configuring Interface Encapsulation on SONET/SDH 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.
Configuring the Encapsulation on a Physical SONET/SDH Interface
For SONET/SDH interfaces, the physical interface encapsulation can be one of the
following:
hierarchy level:
hold-time up milliseconds down milliseconds;
Point-to-Point Protocol (PPP)—PPP encapsulation is defined in RFC 1661, The
Point-to-Point Protocol (PPP) for the Transmission of Multiprotocol Datagrams over
Point-to-Point Links. PPP is the default encapsulation type for physical interfaces.
Two related versions are supported:
Circuit cross-connect (CCC) version (
require an encapsulation statement. When you use this encapsulation type,
you can configure the
Translational cross-connect (TCC) version (
the same configuration restrictions, but used for circuits with different media
on either side of the connection.
Cisco HDLC—E1, E3, SONET/SDH, T1, and T3 interfaces can use Cisco HDLC
encapsulation. Two related versions are supported:
CCC version (
cisco-hdlc-ccc
encapsulation statement. When you use this encapsulation type, you can
configure the
ccc
family only.
Configuring Interface Encapsulation on SONET/SDH Interfaces
Chapter 61: Configuring SONET/SDH Interfaces
hold-time
statement at the
ppp-ccc
)—The logical interfaces do not
family only.
ccc
ppp-tcc
)—The logical interfaces do not require an
[edit interfaces
)—Similar to CCC and has
933
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