15-9
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
OL-14127-08
Chapter 15 Configuring the 8-Port Channelized T1/E1 SPA
Configuration Tasks
Configuring Encapsulation
When traffic crosses a WAN link, the connection needs a Layer 2 protocol to encapsulate traffic. To set
the encapsulation method, use the following commands:
Verifying Encapsulation
Use the show interfaces serial command to verify encapsulation on the interface:
Router# show interfaces serial 2/0/0:0
Serial2/0/0:0 is down, line protocol is down
Hardware is SPA-8XCHT1/E1
MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, crc 32, loopback not set
Keepalive set (10 sec)
LCP Closed, multilink Closed
Last input 1w0d, output 1w0d, output hang never
Last clearing of "show interface" counters 6d23h
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1152 kilobits/sec
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions alarm present
Command Purpose
Router# configure terminal Enters global configuration mode.
Router(config)# interface serial
slot/subslot/port:channel-group
Selects the interface to configure.
• slot/subslot/port:channel-group—Specifies
the location of the interface. See the
“Specifying the Interface Address on a SPA”
section on page 15-6
Router(config-if)# encapsulation
encapsulation-type {hdlc | ppp | frame-relay}
Sets an encapsulation type on the interface:
• hdlc—High-Level Data Link Control (HDLC)
protocol for serial interface. This
encapsulation method provides the
synchronous framing and error detection
functions of HDLC without windowing or
retransmission. This is the default for
synchronous serial interfaces.
• ppp—PPP (for serial interface).
• frame-relay—Frame Relay (for serial
interface).
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