TEI is terminal end point identifier, it is a number given to the router by
the switch at the exchange. 255 means that the exchange has not sent this
number to the router and hence layer 2's state is ESTABLISH_AWAITING_TEI -
ie it is awaiting the reception of a TEI from the switch.
Once the TEI is recieved the TEI value will change and the state will become
MULTIPLE_FRAME_ESTABLISHED (see below)
TEI = 64, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
You can confirm whether the router is receiving a TEI from the switch by
doing the following:
debug isdn q921
term mon
Correct output will look like this:
*Sep 13 15:48:26: ISDN BR0/0: TX -> RRp sapi = 0 tei = 64 nr = 0
*Sep 13 15:48:26: ISDN BR0/0: RX <- RRp sapi = 0 tei = 64 nr = 0
TX is the router sending a message to the ISDN switch requesting a TEI, the
RX is the ISDN switch replying with a TEI.
If the ISDN line is not working properly you will not get the RX's, only the
TX's. If you don't see anything close your ISDN interface and open it again
(NB: this is often enough to bring the layer 2 up as it restarts the
conversation with the switch). If shut / no shuting the interface doesn't
work, try calling the ISDN number from a standard voice phone - sometimes
the lines "go to sleep" and this can be enough to wake them up. If this
does not resolve it, get back to your service provider.
Cheers,
Si
Study Cisco <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi all
>
> I am getting following problem...could anyone help
> me.....
> ****************************************************
> ISDN BRI2/1 interface
> dsl 17, interface ISDN Switchtype = basic-net3
> Layer 1 Status:
> ACTIVE
> Layer 2 Status:
> TEI = 255, Ces = 1, SAPI = 0, State =
> ESTABLISH_AWAITING_TEI
> Layer 3 Status:
> 0 Active Layer 3 Call(s)
> Activated dsl 17 CCBs = 0
> ******************************************************
>
> This is one of the log and could any one tell me ,
> what is TEI, Ces, SAPI, State, etc
>
> thanks in adv...
>
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