TelePresence Multiparty and Video Conferencing Ping Response and MTU Size Restrictions

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Updated:July 18, 2014
Document ID:117926

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Introduction

This document describes the maximum number and the Maximum Transmission Unit (MTU) size of the pings to which the Cisco TelePresence Multiparty Conferencing Bridges and Video Conferencing Gateways respond.

Maximum Number and MTU Size of Pings

The Cisco TelePresence Multiparty Conferencing Bridges and Video Conferencing Gateways appear to display significant packet loss when tested with ping floods. The responses from these devices are limited in order to avoid overloads. These limits are applied in the kernel, so they appear cross-product.

This table details the maximum number of pings and the MTU size of the pings to which each device responds:

 DeviceMaximum Ping ResponsesMaximum Size of Ping Responses
Cisco 4200 Series Multipoint Control Unit (MCU) 100 pings/second 76-byte payload
Cisco 8420 Series MCU
Cisco 4500 Series MCU
Cisco 3200 Series ISDN Gateway (GW)
Cisco 3241 Series ISDN GW
Cisco 8320 Series ISDN GW
Cisco 8321 Series ISDN GW
Cisco 3500 Series IP GW
Cisco 8350 Series IP GW
Cisco 8330 Series Serial GW
Cisco 3200 Series IP Video Conference Recording (VCR)
Cisco 8220 Series IP VCR
Cisco 8050 Series Supervisor
Cisco 5300 Series MCU 199 pings/second No limit,
MTU-dependent
Cisco 8510 Series MCU
Cisco 8710 Series TelePresence Server (TPS)
Cisco 7010 Series TPS
Cisco 3600 Series Advanced Media Gateway



Revision History

Revision Publish Date Comments
1.0
18-Jul-2014
Initial Release
TAC Authored

Contributed by Cisco Engineers

  • Alex Shaw
    Cisco Engineering
  • Katrina Currie
    Cisco Engineering
  • Adam Wamsley
    Cisco TAC Engineer

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