
On most Cisco IOS [routing](/routing) platforms, when [Multicast](/multicast) features are enabled, the default [IGMP](/igmp) version used is version 2.

## Links

https://networklessons.com/multicast/igmp-version-1

IGMP default IOS configurations

GNS3 how to obtain Cisco IOS images

GRE - Keepalives and VRF-aware tunnels

GRE - Recursive routing error - AD solution

GRE - Recursive routing error - filtering solution

GRE - Recursive routing error

GRE - Understanding how keepalives work

GRE MTU settings

GRE Tunnel Addressing

GRE and IPSec

GRE tunnel and multicast

GRE tunnel key operation with only one tunnel key configured

GRE tunnel key

GRE tunnels and how they transmit multicast packets

Gateway Load Balancing Protocol (GLBP)

HSRP - Deployment in Distribution Layer

HSRP - standby group numbers

HTTP - viewing HTTP messages in Wireshark

Hardware - Application Specific Integrated Circuit (ASIC)

Hardware - Layer-3-aware ASIC and IGMP snooping

High-Level Data Link Control (HDLC)

Higher Bandwidth Doesn't Always Mean Faster Speeds

Home lab computer requirements

Hot Standby Router Protocol (HSRP)

How to learn Python for networking

How to practice labbing - best practices

How to prepare for Cisco DNA

IANA

ICANN

ICMP - Mitigating Vulnerabilities

ICMP - Vulnerabilities

ICMP - response to a ping that is blocked by an ACL

ICMP DF-bit in Echo Request and Reply

ICMP Echo Request and Reply Size

ICMP codes and types

ICMP

IEEE

IETF

IGMP - Snooping Querier Election

IGMP - Snooping Querier

IGMP - access group

IGMP - fast leave

IGMP - filtering using ACLs

IGMP - ip igmp snooping querier command

IGMP - membership report

IGMP - using VLAN access maps to filter multicast traffic

IGMP Join vs PIM Join in Multicast Routing

IGMP Snooping internal interface

IGMP Type 0x11 for Membership Queries

IGMP last member query interval

IGMP membership query max response time

IGMP membership reports destination

IGMP report suppression

IGMP snooping inspects PIM hello packets

IGMP snooping prevents report suppression

IGMP snooping source IP address for messages

IGMP snooping

IGMP version 1 how hosts stop receiving multicast traffic

IGMP

IGMPv2 - leave group message mechanism

IGRP

IOS - Configuration Archive and Rollback

IOS - ROMMON reset command

IOS - Right To Use (RTU) License

IOS - What is ROMMON

IOS - ip http server

IOS - licensing

IOS - show license command

IOS - using ftp or tftp source-interface command

IOS configuration register

IOS install mode vs bundle mode

IOS key chain feature

IP - When is the TTL decremented in a router

IP Address Management (IPAM) Tools

IP Addressing on a Router

IP Fragmentation - effects on network traffic

IP Fragmentation Attack

IP Route Profile

IP Routing table - process by which entries are matched

IP SLA - Responder Functionality

IP SLA - Route Flapping Problem

IP SLA Parameters

IP SLA tracking syntax

IP addressing on a Switch

IP routing table - 'L' and 'C' entries

IP routing table - candidate default route

IP routing table - default route

IP routing table - static route

IPSec - Authentication Header (AH)

IPSec - ESP vs AH

IPSec - Encapsulating Security Payload (ESP)

IPSec - Key Exchange Data

IPSec - NAT, AH, and ESP

IPSec - crypto map multiple peers

IPSec - crypto-map vs transform-set

IPSec - why does IKE need two phases

IPSec ESP Wireshark decrypt payload

IPSec NAT Transparency

IPSec how it works with NAT-T