Unanswered Question
Jan 21st, 2009
User Badges:

I have been testing 2610 and 2611 routers (The only connection is through console port and ethernet to the TFTP server).i have not connected the ISDN, ASDL or SERIAL INTERFACES with any cable. The routers recognize all the Ethernet and WAN interfaces. The ethernet LED is OK but the WAN cards LED are off. I have configured the interfaces of these WAN cards(A BRI, ISDN and SERIAL interfaces) with IP address, when i use the command Show interface i can see all the interfaces are UP and line protocol is UP. Is this enough to testify that the WAN interfaces are GOOD or is there any other technical way to test these interfaces. Does it need to connect all these WAN cards and PING them or is there a command which will be enough to prove that the WAN interfaces are all GOOD and not FAULTY. Can i use loopback command without using cables to test these interfaces? Please i need your help.

Best Regards

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 4.7 (3 ratings)
paolo bevilacqua Wed, 01/21/2009 - 15:25
User Badges:
  • Super Gold, 25000 points or more
  • Hall of Fame,

    Founding Member

Hi, not diagnostic is 100% sure unless you connect the interface to something. That is the interface can be faulty passing all software diagnostic tests.

Depending on the interface, you connect differently for testing, eg serial using a null modem cable, ISDN BRI to a BRI port set as network-side, Ethernet and T1 ause a loopback plug, etc.

bagvanliju Thu, 01/22/2009 - 04:26
User Badges:


Can some one tell what is the diffrence between Data pattern [0xABCD]: 0x0000 (Data pattern [0xABCD]: 0x0000)

Router#ping ip

Target IP address:

Data pattern [0xABCD]: 0x0000





thanks in advance


paolo bevilacqua Thu, 01/22/2009 - 04:38
User Badges:
  • Super Gold, 25000 points or more
  • Hall of Fame,

    Founding Member

These are just bit patterns to fill the payload with. Certain patterns are better "clock-breakers" than others, but the difference shows only on marginal circuits. That is, in practice you can ignore the pattern in everyday testing.

amouralamein Thu, 01/22/2009 - 05:21
User Badges:

Hello ujil

I think oxABCD refers to hexadecimal and that

is 0x0000, 0x means the digits which follows such as

1111 or ffff or aaaa are hexadecimals digits.

each of these they translate a certain decimal value.


This Discussion