AlliedWare OS How To Note Igmp | Allied Telesis AR400 manual

IGMP throttling (limiting the number of streams for each subscriber) > Explanation of IGMP throttling (limiting the number of streams

When switch 2 drops groups by throttling, it does not send a Leave message, because IGMP snooping cannot generate IGMP packets. Therefore, the Querier (switch 1) still believes that switch 2 is interested in the throttled groups, as output from the command show ip igmp on switch 1 shows.

Manager Switch 1> show ip igmp

IGMP Protocol

------------------------------------------------------------------------

Status	...........................			Enabled
Default	Query Interval			125 secs
Default	Timeout Interval			260 secs
Last Member		Query Interval		10 (1/10secs)
Last Member		Query Count		2
Robustness Variable				2
Query Response Interval				100 (1/10secs)
Disabled All-groups ports			........	None
Interface Name			vlan100	(DR)
Group List
Group. 224.12.13.13			Last Adv. 172.31.0.222		Refresh time 215 secs
Ports	49
Group. 224.12.13.14			Last Adv. 172.31.0.222		Refresh time 215 secs
Ports	49
Group. 224.12.13.15			Last Adv. 172.31.0.222		Refresh time 215 secs
Ports	49
Group. 224.12.13.16			Last Adv. 172.31.0.222		Refresh time 215 secs
Ports	49
Group. 224.12.13.17			Last Adv. 172.31.0.222		Refresh time 217 secs
Ports	49
Group. 224.12.13.18			Last Adv. 172.31.0.222		Refresh time 217 secs
Ports	49
Group. 224.12.13.19			Last Adv. 172.31.0.222		Refresh time 217 secs
Ports	49
Group. 224.12.13.11			Last Adv. 172.31.0.222		Refresh time 238 secs
Ports	49
Group. 224.12.13.12			Last Adv. 172.31.0.222		Refresh time 238 secs
Ports	49

------------------------------------------------------------------------

This can cause the Querier to temporarily send more groups than necessary to a switch. The older groups will eventually time out.

Note that the group list is sorted by refresh time, not group address.

The output above also shows that the IGMP Querier only records the IP address of the last interested client—the Last Adv field shows the IP of the client who last sent an IGMP

Page 45 AlliedWare™ OS How To Note: IGMP

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Allied Telesis AR400 manual 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 5 AlliedWare OS How To Note Igmp Igmp overviewQueriers 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 9 AlliedWare OS How To Note Igmp Igmp snoopingExample 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 When a client leaves a group Group List Entry timeout 247 secs Ports14 AlliedWare OS How To Note Igmp Multiple potential Igmp queriers 15 AlliedWare OS How To Note Igmp 16 AlliedWare OS How To Note Igmp When there are no group members Other Querier timeout .. secs17 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 19 AlliedWare OS How To Note Igmp Group ListGroup 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 Query solicitation rapid recovery from topology changes 26 AlliedWare OS How To Note IgmpHow query solicitation works Initial state 27 AlliedWare OS How To Note Igmp Why convergence takes so long without query solicitation 28 AlliedWare OS How To Note IgmpExample 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 Types command Set switch port=1 igmpfilter=136 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 When we deny groups instead of replacing them Modify switch 2 Configuration46 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 Group Entry timeout Infinity Ports 51 AlliedWare OS How To Note IgmpExplanation 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 56 AlliedWare OS How To Note Igmp MulticastPkts 36350MulticastPkts 14756 When a static entry’s port goes down Group Entry timeout Infinity Ports None57 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 Configurable Igmp timers and counters Timer and counter relationships69 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 77 AlliedWare OS How To Note Igmp Query Response IntervalQuery Response Interval 100 10secs Default Timeout Interval Synchronisation of timers78 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 Enable Igmp debugging Entry timeout 259 Secs93 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 Configuring switch 96 AlliedWare OS How To Note Igmp224.0.0.5 97 AlliedWare OS How To Note Igmp Configuring switches 1 98 AlliedWare OS How To Note IgmpAdding other router addresses Returning to the default list 99 AlliedWare OS How To Note Igmp224.0.0.254 100 AlliedWare OS How To Note Igmp Using the other routermode options 101 AlliedWare OS How To Note Igmp Statically specifying that a port is a router portCheck 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 103 AlliedWare OS How To Note Igmp Igmp debuggingClient 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 106 AlliedWare OS How To Note Igmp Report is filtered outPort 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