Configuring Serial Interfaces on Cisco IOS XR Software
Information About Serial Interfaces
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 14 are present. These default settings can be changed by configuration. Default settings do not appear in the output of the show
Table 14 | Serial Interface Default Settings |
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Parameter |
| Configuration File Entry | Default Settings |
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Keepalive |
| keepalive [disable] | keepalive 10 seconds |
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| no keepalive |
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Encapsulation | encapsulation [hdlc ppp] | hdlc | |
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Maximum transmission unit (MTU) | mtu bytes | 4474 bytes | |
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Cyclic redundancy check (CRC) | crc [16 32] | 32 | |
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Data stream inversion on a serial | invert | Data stream is not inverted | |
interface |
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Payload scrambling (encryption) | scramble | Scrambling is disabled. | |
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Number of | Default is 0 (disabled). | ||
Control (HDLC) flag sequences to be |
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inserted between the packets |
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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
interface serial 0/0/1/2/4:3.
Note A slash between values is required as part of the notation.
The naming notation syntax for serial interfaces is as follows:
•rack: Chassis number of the rack.
•slot: Physical slot number of the modular services card or line card.
•module: Module number. Shared port adapters (SPAs) are referenced by their subslot number.
•port: Physical port number of the T3 controller.
Cisco IOS XR Interface and Hardware Component Configuration Guide