Configuring Serial Interfaces on the Cisco ASR 9000 Series Router
How to Configure Serial Interfaces
518
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
OL-26061-03
What to Do Next
To modify the default configuration of the serial interface you just brought up, see the “Configuring
Optional Serial Interface Parameters” section on page 518.
Configuring Optional Serial Interface Parameters
This task describes the commands used to modify the default configuration on a serial interface.
Prerequisites
Before you modify the default serial interface configuration, you must bring up the serial interface and
remove the shutdown configuration, as described in the “Bringing Up a Serial Interface” section on
page 514.
Restrictions
The configuration on both ends of the serial connection must match for the interface to be active.
SUMMARY STEPS
1. configure
2. interface serial interface-path-id
3. encapsulation [hdlc | ppp | frame-relay [IETF]
4. serial
5. crc length
6. invert
7. scramble
8. transmit-delay hdlc-flags
9. end
or
commit
10. exit
Step 10
show ipv4 interface brief
Example:
RP/0/0RP0RSP0/CPU0:router # show ipv4 interface
brief
Verifies that the interface is active and properly configured.
If you have brought up a serial interface properly, the
“Status” field for that interface in the show ipv4 interface
brief
command output displays “Up.”
Step 11
show interfaces serial interface-path-id
Example:
RP/0/0RP0RSP0/CPU0:router# show interfaces
serial 0/1/0/0
(Optional) Displays the interface configuration.
Command or Action Purpose
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