The fact that CM servers have a 1024 limit on ARP table entries is a well-known issue. I found the following blurb in several of the administration guides, though:
Do not install Cisco Unified Communications Manager in a large Class A or Class B subnet that contains a large number of devices. When you install Cisco Unified Communications Manager in a large subnet with a large number devices in that subnet, the Address Resolution Protocol (ARP) table can fill up quickly (maximum 1024 entries, by default). When the ARP table gets full, Cisco Unified Communications Manager can have difficulty talking to endpoints and cannot add more phones.
I know that subnets this large would not be a recommended design, but the "by default" suggests that you could reconfigure this limit on CM, at least for the short-term until the logical topology could be re-designed/deployed. I haven't found any supporting documentation on how to do this, if it's even possible.
“UCCE Solution Troubleshooting Based on Comprehensive Call Flow for CVP and IP IVR Deployment Models”
This event will have place on Thursday 22, October 2020 at 10hrs PDT
Contact Center call flows are fundamental to the successful implementation an...
[ The link to the discussion will be published on October 22nd ]
This topic is a chance to clarify your questions about the implementation, best practices and support of Customer Voice Portal (CVP) and IP Interactive Voice Response (IP IVR) deploymen...
I have questions from the above guides:
A company currently has two different UC environments. One in the US and one in the UK. The US UC environment has (3) CUCM servers (Publisher and 2 subscribers), (2) IMP servers (P...
IP telephony (Internet Protocol telephony) is a term used to describe technologies that use a variety of protocols to exchange voice, fax, and other forms of information, traditionally carried over the Public Switched Telephone Netwo...