2621xm with nm-16a and LOW speeds

I have a TAC opened but I was wondering if anyone out there has any
ideas....

We are installing 2621XMs with nm-16a in some and nm-4a/s in others.
Connected to these serial modules are asynchronous devices working at
VERY low baud rates (as low at 150 baud).
The problem that we are finding is that the serial data is being
fragmented. Where the baud rate is so slow the router is sending the
information off before it has all arrived.
Ideas?

A. Andrews

Hi

If it is IP you are using then you could try this. (Only try - no
guarentees! )

What it does is sets the 'Don't Fragment' bit in an IP header incoming
on serial1 so routers can't fragment the packet.

interface Serial1
ip policy route-map set-df
!
route-map set-df permit 10
match ip address 1
set ip df 1

Simon

Simon Tibbitts

~ I have a TAC opened but I was wondering if anyone out there has any
~ ideas....
~
~ We are installing 2621XMs with nm-16a in some and nm-4a/s in others.
~ Connected to these serial modules are asynchronous devices working at
~ VERY low baud rates (as low at 150 baud).
~ The problem that we are finding is that the serial data is being
~ fragmented. Where the baud rate is so slow the router is sending the
~ information off before it has all arrived.
~ Ideas?

Perhaps something like this could work ...

For a pretty generic dispatch-on-pause, you'd use something like:

state-machine pauses 0 0 255 0 delay
line 1 16
dispatch-machine pauses

It reads as "in state 0, have all characters (0-255) transition (back) to
state 0, after starting the "transmit on pause" timer"

Aaron

Aaron Leonard

Thanks guys Ill do some reading on that!


Aaron Leonard <> wrote in message news:<>. ..
> ~ I have a TAC opened but I was wondering if anyone out there has any
> ~ ideas....
> ~
> ~ We are installing 2621XMs with nm-16a in some and nm-4a/s in others.
> ~ Connected to these serial modules are asynchronous devices working at
> ~ VERY low baud rates (as low at 150 baud).
> ~ The problem that we are finding is that the serial data is being
> ~ fragmented. Where the baud rate is so slow the router is sending the
> ~ information off before it has all arrived.
> ~ Ideas?
>
> Perhaps something like this could work ...
>
> For a pretty generic dispatch-on-pause, you'd use something like:
>
> state-machine pauses 0 0 255 0 delay
> line 1 16
> dispatch-machine pauses
>
> It reads as "in state 0, have all characters (0-255) transition (back) to
> state 0, after starting the "transmit on pause" timer"
>
> Aaron

A. Andrews