Contents

Introduction

Maximum Number and MTU Size of Pings

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:

Device

Maximum Ping Responses

Maximum 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