Default Settings For Serial Interface Configurations; Serial Interface Naming Notation - Cisco ASR 9000 Series Configuration Manual

Configuring Serial Interfaces on the Cisco ASR 9000 Series Router

Default Settings for Serial Interface Configurations

When an interface is enabled on a T3/E3 SPA, and no additional configuration commands are applied,
the default interface settings shown in
configuration.
Table 21
Parameter
Keepalive
Note
Encapsulation
Maximum transmission unit
(MTU)
Cyclic redundancy check
(CRC)
Data stream inversion on a
serial interface
Payload scrambling
(encryption)
Number of High-Level Data
Link Control (HDLC) flag
sequences to be inserted
between the packets
Default settings do not appear in the output of the show running-config command.
Note

Serial Interface Naming Notation

The naming notation for serial interfaces on a clear channel SPA is rack/slot/module/port, as shown in
the following example:
interface serial 0/0/1/2
The naming notation for T1, E1, and DS0 interfaces on a channelized SPA is
rack/slot/module/port/channel-num:channel-group-number, as shown in the following example:
interface serial 0/0/1/2/4:3
OL-26061-03
Serial Interface Default Settings
The keepalive
command applies to
serial interfaces using
HDLC or PPP
encapsulation. It does
not apply to serial
interfaces using Frame
Relay encapsulation.
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
Table 21 are present. These default settings can be changed by
Configuration File Entry
keepalive [disable]
no keepalive
encapsulation [hdlc | ppp |
frame-relay [ietf]]
mtu bytes
crc [16 | 32]
invert
scramble
transmit-delay
Information About Configuring Serial Interfaces
Default Settings
keepalive 10 seconds
hdlc
1504 bytes
16
Data stream is not inverted
Scrambling is disabled.
Default is 0 (disabled).
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