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Router 7200 accept crc4 config but does not show it on show interface

frank2812
Beginner
Beginner

Hi guys, I have a Router 7200  with this version "IOS (tm) 7200 Software (C7200-JK9S-M), Version 12.2(21a), RELEASE SOFTWARE (fc2)". I need to configure the serial 4/0 like "no crc4" or "crc4". When i configure crc4  it takes the changes but does not show it on show inter serial "4/0", it still show crc16 that is the  default value. On the second case i configure crc 32 and the router show the change but when i put "no crc" it returns to default "crc16". I reviewed the documentation about this router and says that if i put "crc4" should take it. Could you help me with this???

RPCA_MT_601(config)#interface Serial4/0

RPCA_MT_601(config-if)#crc4

RPCA_MT_601(config)#exit

RPCA_MT_601#show inter Serial4/0

Serial4/0 is up, line protocol is down

  Hardware is 4ME1-UNBAL

  Description: Ruta IVR SCR-CCS  Trail ID 20462 XDM CAN2 I5-01 XDM MSCR I3-43

  Internet address is 192.168.116.69/30

  MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,

     reliability 128/255, txload 1/255, rxload 1/255

  Encapsulation HDLC, crc 16, loopback not set

  Keepalive set (10 sec)

  Restart-Delay is 0 secs

3 Replies 3

paolo bevilacqua
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

There is no such thing as CRC4 for HDLC circuits. So if the router "takes" it, is a bug.

if  i put ppp encapsulation then it would accepts the crc4? in a router 7200 with the version that i mention before i could configure the serial interface like unframe (framing no-crc4)? how can i do this? because whe i put no crc  it returns tu the default crc16. How can i disable the crc feature in a 7200??

Again: CRC4 is only for E1 controller level, not serial interface, no matter encapsulation type.

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