Hello all,
We are having a peculiar issue over here and it has us at a loss. We currently use Cisco 2811 and 899G routers at most of our facilities, but we have undergone a project to replace these facility routers with Cisco 4321 routers. At the sites we have replaced the routers with 4321s, we are experiencing extremely slow speeds when trying to access the PBX web UI. These slow speeds are causing management headaches because of the volume of phones we use in the Mitel environment, and the volume of changes we make daily. Below you will find some basic notes on our setup between the two devices and how we access the web UI. I have done quite a bit of troubleshooting on this already, I've confirmed the configuration from old router to new router are the same including speed and duplex settings, NIC card firmwares on both router and PBX are up to date, web browsers are at the recommended levels for access to the UI, and I have confirmed a faster experience when switching back to the old 2800 series router. We have very minimal CRC and interface errors on the local switchport housing the PBX and the LAN port on the router. Any feedback is greatly appreciated, let me know what other information you would like, I cannot supply everything but will do my best.
Cisco 4321 Router:
Cisco IOS XE Software, Version 03.16.05.S - Extended Support Release
Cisco IOS Software, ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.5(3)S5, RELEASE SOFTWARE (fc2)
Mitel PBX:
Model: Mitel 3300 ICP
Release Level: 6.0 SP3
Active Software Load: 12.0.3.15
