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Cisco Ubr drop of service

By crossover2388 ·
Why is it when I apply an access list thet enables individual users to access ports(like port 80), why does the Ubr crawl and come to a complete stop in proccessing modems information? The network temporarily goes down until the access list has applied all of its rights(permits and denys). As soon as the list is complete and I save its alterations, network comes back up. What is up with that? I'm going to also consult with Cisco.

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Cisco Ubr drop of service

by ckilday In reply to Cisco Ubr drop of service

I suspect it has to do with the initialization process because you have changed the parameters on the router and the cable modem has to re-initialize before it can send traffic again. Cisco has several web-pages devoted to troubleshooting uBR stuff. Here's one that includes a block diagram of the cable modem initialization. It's at

Hope this helps. If not, I'm sure the Cisco TAC can. Best wishes,
- ck

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