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Bridging over ISDN - SNA Traffic

According to CCO, bridging on an ISDN connection tends to keep the connection active for very long periods of time , if not permanently (due to frequent keepalive packets).

But, in the case of SNA traffic, would it be possible to use the following command to permit the most common SNA SAPs as interesting traffic, and deny the rest?

dialer-list 1 protocol bridge list <200-299>

access-list <200-299> permit <SAPs>

Would this be a workaround for ensuring that the ISDN line is not kept up permanently or for long periods of time?

Are there are any potential drawbacks with what I am suggesting?

Thanks in advance for your help.

1 ACCEPTED SOLUTION

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Bronze

Re: Bridging over ISDN - SNA Traffic

Yes, you can do this. The usual access list for permitting all SNA traffic is

access-list 200 permit 0x0000 0x0D0D

This will permit all multiples of 4 excluding the poll/final bit.

The disadvantage though is that without local acknoledgement, unproducctive polling will keep the ISDN line up.

A better solution would be to use DLSW. See the following URL for an example of this -

http://www.cisco.com/warp/customer/697/dlswdodisdn.html

1 REPLY
Bronze

Re: Bridging over ISDN - SNA Traffic

Yes, you can do this. The usual access list for permitting all SNA traffic is

access-list 200 permit 0x0000 0x0D0D

This will permit all multiples of 4 excluding the poll/final bit.

The disadvantage though is that without local acknoledgement, unproducctive polling will keep the ISDN line up.

A better solution would be to use DLSW. See the following URL for an example of this -

http://www.cisco.com/warp/customer/697/dlswdodisdn.html

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