said by dadarkside:The Cisco 7246 under certain older code was susceptible to MAC forwarding table corruption. To prevent that, you configure the UBR to maintain a fixed table (ARP aging). Tis saved memory for other processes, but it caused issues when the CPE changes.
The UBR 10K, which is a much more "robust" chassis, and was used widely in parts of Florida, Ohio and Virginia never had this issue, as the chassis had a much beefier CPU, more memory and cleaner running code.
As for the Cisco UBR being a dog...well, the older 7246 chassis was limited, but generally stable, as long as you didn't push it too hard. The UBR 10K, however, is probably one of the BEST CMTS Chassis' I have ever worked with. I have seen them support 20,000 customers without issue.
Thanks for clearing this up!
