Igmp fast leave | Allied Telesis AR400 instruction

IGMP fast leave > Example

IGMP fast leave

IGMP Fast Leave enhances your control over router or switch bandwidth. Enabling Fast Leave tells IGMP snooping to stop the transmission of a group multicast stream to a port as soon as it receives a Leave message on that port. No timeouts are observed.

Ordinarily, when IGMP snooping sees a Leave message, it waits for a Membership Query message before setting the entry timeout to 2 seconds. Fast Leave tells IGMP to drop the entry from the port as soon as the Leave message is seen. For this reason, Fast Leave should only be configured on interfaces that have one clien t per port.

Availability IGMP Fast Leave is available in Software Version 2.7.5 or later. In Software Versions earlier than 281-03 and 2.9.1, configure it by using the command:

set igmpsnooping fastleave={onoff} interface=vlanx

In Software Versions 281-03 and 2.9.1, the syntax changed to make it consistent with Query Solicitation. Therefore, the above syntax is still valid but the recommended syntax is now:

set igmpsnooping vlan=vlanx fastleave={onoff}

Software Version 291-08introduced multiple mode for Fast Leave. See "Multiple host mode for fast leave" on page 67.

Example

This example uses the same network configuration as "IGMP snooping" on page 9. For convenience, the diagram is reproduced below.

	Multicast Server
	port 1	AT-8948
		AT-8948	Switch 1:
			Querier
	port 50	port 49
	(blocked by STP)
	port 26		port 26
Switch 2:	Rapier 24i		Rapier 24i	Switch 3:
Snooper	port 25		port 25	Snooper
Snooper	port 2		port 3	Snooper
	port 2		port 3
	Client 1		Client 2
				igmp-snooper.eps

Page 61 AlliedWare™ OS How To Note: IGMP

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Allied Telesis AR400 manual Igmp fast leave, AlliedWare OS How To Note Igmp

Contents

Introduction Contents How clients leave groups queries and timers Query solicitation rapid recovery from topology changesConfigurable Igmp timers and counters Example of bad choices for timer values Products and software versions this note applies to 4 AlliedWare OS How To Note Igmp Igmp feature Software versions Products Igmp overview 5 AlliedWare OS How To Note IgmpQueriers and Snoopers Messages 6 AlliedWare OS How To Note Igmp Choosing group addresses 7 AlliedWare OS How To Note IgmpIP address, binary MAC address, hex Avoid x.0.0.y, x.0.1.y, x.128.0.y, and x.128.1.y 8 AlliedWare OS How To Note Igmp Igmp snooping 9 AlliedWare OS How To Note IgmpExample 10 AlliedWare OS How To Note Igmp Configure switch Explanation of Igmp snooping 11 AlliedWare OS How To Note Igmp Group List Entry timeout 136 secs Ports None Using Show command output to investigate Igmp stateGroup List Entry timeout 257 Secs Ports All Groups 235 12 AlliedWare OS How To Note Igmp Group Last Adv 13 AlliedWare OS How To Note Igmp Group List Entry timeout 247 secs Ports When a client leaves a group14 AlliedWare OS How To Note Igmp Multiple potential Igmp queriers 15 AlliedWare OS How To Note Igmp 16 AlliedWare OS How To Note Igmp Other Querier timeout .. secs When there are no group members17 AlliedWare OS How To Note Igmp Group List Entry timeout 225 secs Ports When a client joins a groupAll Groups Entry timeout Secs Ports 18 AlliedWare OS How To Note Igmp Group List 19 AlliedWare OS How To Note IgmpGroup List Last Adv 20 AlliedWare OS How To Note Igmp Igmp proxy 21 AlliedWare OS How To Note Igmp 22 AlliedWare OS How To Note Igmp Switch 3 is an Igmp Proxy All Groups Entry timeout 145 Secs Ports Group List Entry timeout 122 secs Ports None23 AlliedWare OS How To Note Igmp Explanation of Igmp proxy 24 AlliedWare OS How To Note Igmp Group Entry timeout Secs Ports 25 AlliedWare OS How To Note Igmp Group Entry timeout 182 secs Ports 26 AlliedWare OS How To Note Igmp Query solicitation rapid recovery from topology changesHow query solicitation works Initial state 27 AlliedWare OS How To Note Igmp 28 AlliedWare OS How To Note Igmp Why convergence takes so long without query solicitationExample 29 AlliedWare OS How To Note Igmp Explanation from the perspective of switch 2, the snooper 30 AlliedWare OS How To Note Igmp All Groups Entry timeout 236 secs Ports Group Entry timeout 18 secs Ports Explanation from the perspective of switch 1, the querier31 AlliedWare OS How To Note Igmp Shows this entry 32 AlliedWare OS How To Note Igmp Group Entry timeout 115 secs Ports Speeding up Igmp convergence in a non-looped topology 33 AlliedWare OS How To Note Igmp Switch 1 sends GQ 34 AlliedWare OS How To Note Igmp Igmp filtering controlling multicast distribution 35 AlliedWare OS How To Note Igmp Set switch port=1 igmpfilter=1 Types command36 AlliedWare OS How To Note Igmp 37 AlliedWare OS How To Note Igmp Switch 3 is also an Igmp Snooper Received Passed Dropped 38 AlliedWare OS How To Note Igmp No group memberships 39 AlliedWare OS How To Note Igmp 40 AlliedWare OS How To Note Igmp 41 AlliedWare OS How To Note Igmp 42 AlliedWare OS How To Note Igmp 43 AlliedWare OS How To Note Igmp 44 AlliedWare OS How To Note Igmp 45 AlliedWare OS How To Note Igmp Modify switch 2 Configuration When we deny groups instead of replacing them46 AlliedWare OS How To Note Igmp 47 AlliedWare OS How To Note Igmp Group 224.12.13.11 Entry timeout 255 secs Ports 224.12.13.12 Static Igmp 48 AlliedWare OS How To Note Igmp 49 AlliedWare OS How To Note Igmp Switch 2 is an Igmp Snooper 50 AlliedWare OS How To Note Igmp 51 AlliedWare OS How To Note Igmp Group Entry timeout Infinity PortsExplanation of Static Igmp Modify switch 3 Configuration When we add a static entry on another switch52 AlliedWare OS How To Note Igmp MulticastPkts 675826 53 AlliedWare OS How To Note Igmp All Groups Entry timeout 247 secs Ports 54 AlliedWare OS How To Note Igmp 55 AlliedWare OS How To Note Igmp Group Entry timeout Infinity Ports 5,26 MulticastPkts 36350 56 AlliedWare OS How To Note IgmpMulticastPkts 14756 Group Entry timeout Infinity Ports None When a static entry’s port goes down57 AlliedWare OS How To Note Igmp Querier timer values How clients leave groups queries and timers58 AlliedWare OS How To Note Igmp Overview of leave process 59 AlliedWare OS How To Note Igmp Snooper timer values 60 AlliedWare OS How To Note Igmp Comparing the Querier and Snooper timersConsequences for high-loss and high-lag networks Describes the new behaviour Igmp fast leave 61 AlliedWare OS How To Note Igmp 62 AlliedWare OS How To Note Igmp Switch 1 is an Igmp Querier Explanation of Igmp fast leave 63 AlliedWare OS How To Note Igmp Group Entry timeout 2 secs Ports When fast leave is disabled64 AlliedWare OS How To Note Igmp Fast Leave Off It is safe to ignore the group entry on switch When you enable fast leave on switchGroup Entry timeout Secs Ports None 65 AlliedWare OS How To Note Igmp 66 AlliedWare OS How To Note Igmp When you set fast leave on all interfaces To specify multiple mode, use the command Multiple host mode for fast leaveTo specify single mode, use either of the commands 67 AlliedWare OS How To Note Igmp 68 AlliedWare OS How To Note Igmp Timer and counter relationships Configurable Igmp timers and counters69 AlliedWare OS How To Note Igmp Each example modifies the following base configuration Initial configuration70 AlliedWare OS How To Note Igmp Software versions 71 AlliedWare OS How To Note Igmp 72 AlliedWare OS How To Note Igmp Default valuesLast Member Query Count and Last Member Query Interval What these counters do How to change these counters Potential problems with changing these counters73 AlliedWare OS How To Note Igmp Last Member Query Interval 255 10secs Last Member Query Count 74 AlliedWare OS How To Note Igmp How to change this counter Potential problems with changing this counterRobustness Variable What this counter does What this timer does Default Query IntervalPotential problems with changing this timer How to change this timer Query Response Interval 77 AlliedWare OS How To Note IgmpQuery Response Interval 100 10secs Synchronisation of timers Default Timeout Interval78 AlliedWare OS How To Note Igmp 79 AlliedWare OS How To Note Igmp Default Timeout Interval = 2*130 + 100/10 = 270 seconds Default Timeout Interval 280 Secs Default Timeout Interval = 2*125 + 100/10 = 260 seconds80 AlliedWare OS How To Note Igmp Query Response Interval 200 10secs 81 AlliedWare OS How To Note Igmp Default Timeout Interval 180 Secs 82 AlliedWare OS How To Note Igmp Default Query Interval 200 Secs Default Timeout Interval 410 Imagine the following changes to the configuration Example of bad choices for timer valuesCommands to configure these settings are 83 AlliedWare OS How To Note Igmp Problem 2 Query Response Interval short Problem 1 Last Member Query Interval too shortProblem 3 Default Timeout Interval too short Last Member Query Interval was set to 5, using the command 85 AlliedWare OS How To Note Igmp For more information, see Synchronisation of timers on Stopping snoopers from snooping non-IGMP messages 86 AlliedWare OS How To Note Igmp 87 AlliedWare OS How To Note Igmp 88 AlliedWare OS How To Note Igmp Configure the routerRouter uses Ospf Ports 24 Ports 25 89 AlliedWare OS How To Note Igmp 90 AlliedWare OS How To Note Igmp Disabled All-groups PortsPreventing an All Groups entry for a port Disabling All Groups entry for a port Reset port 24’s packet counters Check the group entry timeout valuesEntry timeout 216 Secs Enabling All Groups entry again Entry timeout Secs Check the group entry timeout values again92 AlliedWare OS How To Note Igmp MulticastPkts Entry timeout 259 Secs Enable Igmp debugging93 AlliedWare OS How To Note Igmp MulticastPkts 914 94 AlliedWare OS How To Note Igmp Controlling which addresses create All Groups entries 95 AlliedWare OS How To Note Igmp 96 AlliedWare OS How To Note Igmp Configuring switch224.0.0.5 97 AlliedWare OS How To Note Igmp 98 AlliedWare OS How To Note Igmp Configuring switches 1Adding other router addresses 99 AlliedWare OS How To Note Igmp Returning to the default list224.0.0.254 100 AlliedWare OS How To Note Igmp Using the other routermode options Statically specifying that a port is a router port 101 AlliedWare OS How To Note IgmpCheck the current Igmp snooping entries 102 AlliedWare OS How To Note Igmp To remove the static configuration, simply delete itStatically add port 6 as a router port attached to Vlan Stop port 6 from being a static router port Igmp debugging 103 AlliedWare OS How To Note IgmpClient joins a group 104 AlliedWare OS How To Note Igmp IgmpSnoopMembershipQuery setting timer at 2 secs for groupClient leaves a group Several minutes later the group entry times out 105 AlliedWare OS How To Note Igmp Manager Switch 3 del vlan=100 port=5Port entry times out Snooped ports change Report is filtered out 106 AlliedWare OS How To Note IgmpPort in the All Groups list is unplugged Output for show ip igmp changes 107 AlliedWare OS How To Note Igmp 108 AlliedWare OS How To Note Igmp SwitchAppendix STP state State Forwarding 109 AlliedWare OS How To Note Igmp Manager Switch 3 show stp port=25-26