Configuring Serial Interfaces on the Cisco ASR 9000 Series Router
Information About Configuring Serial Interfaces
511
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
OL-26061-03
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 Table 21 are present. These default settings can be changed by
configuration.
Note Default settings do not appear in the output of the show running-config command.
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
Table 21 Serial Interface Default Settings
Parameter Configuration File Entry Default Settings
Keepalive
Note The keepalive
command applies to
serial interfaces using
HDLC or PPP
encapsulation. It does
not apply to serial
interfaces using Frame
Relay encapsulation.
keepalive [disable]
no keepalive
keepalive 10 seconds
Encapsulation encapsulation [hdlc | ppp |
frame-relay [ietf]]
hdlc
Maximum transmission unit
(MTU)
mtu bytes 1504
bytes
Cyclic redundancy check
(CRC)
crc [16 | 32] 16
Data stream inversion on a
serial interface
invert Data stream is not inverted
Payload scrambling
(encryption)
scramble Scrambling is disabled.
Number of High-Level Data
Link Control (HDLC) flag
sequences to be inserted
between the packets
transmit-delay Default is 0 (disabled).
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