Allied Telesis AR400 manual Report is filtered out, Port in the All Groups list is unplugged

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IGMP debugging > Example

This example also shows what debugging output looks like when the Snooper receives a General Query. The Querier sends the General Query to the destination address 224.0.0.1 (the IGMP Query address) and the Snooper tells us that it has added the “router” port to its All Groups list. In the IGMP standards, “All routers on this subnet” are identified with the group address of 224.0.0.2, so the debugging output refers to that address.

Manager Switch 3> show igmpsnooping

IGMP Snooping

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

Status			Enabled
Disabled All-groups		ports	........ None
Vlan	Name (vlan id)	..... default (1)
Fast	Leave		Off
Group List
No	group memberships.
Vlan	Name (vlan id)	..... vlan100 (100)
Fast	Leave		Off

Group	List
All	Groups	Entry timeout 144 secs
Ports 26

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

For more information about router addresses, see "Controlling which addresses create All Groups entries" on page 95.

XA report is filtered out

The switch drops a Membership Report because of an IGMP filter. See "Explanation of IGMP filtering (controlling multicast distribution)" on page 38 for more information about filters.

Manager Switch 1>

IGMP filter: discarded report for group 224.0.1.22 on port 1

XA port in the All Groups list is unplugged

The switch deletes a port from the All Groups list after the port is disconnected.

Manager Switch 3> Deleting port 24 from group 224.0.0.2 on vlan100 Reconstructing snooping entries: 25,

Page 106 AlliedWare™ OS How To Note: IGMP

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Contents Contents IntroductionConfigurable Igmp timers and counters Query solicitation rapid recovery from topology changesHow clients leave groups queries and timers Example of bad choices for timer valuesProducts and software versions this note applies to Igmp feature Software versions Products 4 AlliedWare OS How To Note IgmpIgmp overview 5 AlliedWare OS How To Note IgmpQueriers and Snoopers 6 AlliedWare OS How To Note Igmp MessagesIP address, binary 7 AlliedWare OS How To Note IgmpChoosing group addresses MAC address, hex8 AlliedWare OS How To Note Igmp Avoid x.0.0.y, x.0.1.y, x.128.0.y, and x.128.1.yIgmp snooping 9 AlliedWare OS How To Note IgmpExample Configure switch 10 AlliedWare OS How To Note Igmp11 AlliedWare OS How To Note Igmp Explanation of Igmp snoopingGroup List Entry timeout 257 Secs Ports All Groups 235 Using Show command output to investigate Igmp stateGroup List Entry timeout 136 secs Ports None 12 AlliedWare OS How To Note Igmp13 AlliedWare OS How To Note Igmp Group Last AdvGroup List Entry timeout 247 secs Ports When a client leaves a group14 AlliedWare OS How To Note Igmp 15 AlliedWare OS How To Note Igmp Multiple potential Igmp queriers16 AlliedWare OS How To Note Igmp Other Querier timeout .. secs When there are no group members17 AlliedWare OS How To Note Igmp All Groups Entry timeout Secs Ports When a client joins a groupGroup List Entry timeout 225 secs Ports 18 AlliedWare OS How To Note IgmpGroup List 19 AlliedWare OS How To Note IgmpGroup List Last Adv 20 AlliedWare OS How To Note Igmp 21 AlliedWare OS How To Note Igmp Igmp proxySwitch 3 is an Igmp Proxy 22 AlliedWare OS How To Note Igmp23 AlliedWare OS How To Note Igmp Group List Entry timeout 122 secs Ports NoneAll Groups Entry timeout 145 Secs Ports Explanation of Igmp proxyGroup Entry timeout Secs Ports 24 AlliedWare OS How To Note IgmpGroup Entry timeout 182 secs Ports 25 AlliedWare OS How To Note Igmp26 AlliedWare OS How To Note Igmp Query solicitation rapid recovery from topology changesHow query solicitation works 27 AlliedWare OS How To Note Igmp Initial state28 AlliedWare OS How To Note Igmp Why convergence takes so long without query solicitationExample Explanation from the perspective of switch 2, the snooper 29 AlliedWare OS How To Note IgmpAll Groups Entry timeout 236 secs Ports 30 AlliedWare OS How To Note Igmp31 AlliedWare OS How To Note Igmp Explanation from the perspective of switch 1, the querierGroup Entry timeout 18 secs Ports Shows this entryGroup Entry timeout 115 secs Ports 32 AlliedWare OS How To Note Igmp33 AlliedWare OS How To Note Igmp Speeding up Igmp convergence in a non-looped topology34 AlliedWare OS How To Note Igmp Switch 1 sends GQ35 AlliedWare OS How To Note Igmp Igmp filtering controlling multicast distributionSet switch port=1 igmpfilter=1 Types command36 AlliedWare OS How To Note Igmp Switch 3 is also an Igmp Snooper 37 AlliedWare OS How To Note Igmp38 AlliedWare OS How To Note Igmp Received Passed Dropped39 AlliedWare OS How To Note Igmp No group memberships40 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 Group 224.12.13.11 Entry timeout 255 secs Ports 224.12.13.12 47 AlliedWare OS How To Note Igmp48 AlliedWare OS How To Note Igmp Static IgmpSwitch 2 is an Igmp Snooper 49 AlliedWare OS How To Note Igmp50 AlliedWare OS How To Note Igmp 51 AlliedWare OS How To Note Igmp Group Entry timeout Infinity PortsExplanation of Static Igmp 52 AlliedWare OS How To Note Igmp When we add a static entry on another switchModify switch 3 Configuration MulticastPkts 675826All Groups Entry timeout 247 secs Ports 53 AlliedWare OS How To Note Igmp54 AlliedWare OS How To Note Igmp Group Entry timeout Infinity Ports 5,26 55 AlliedWare OS How To Note IgmpMulticastPkts 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 58 AlliedWare OS How To Note Igmp How clients leave groups queries and timersQuerier timer values Overview of leave processSnooper timer values 59 AlliedWare OS How To Note IgmpConsequences for high-loss and high-lag networks Comparing the Querier and Snooper timers60 AlliedWare OS How To Note Igmp Describes the new behaviour61 AlliedWare OS How To Note Igmp Igmp fast leaveSwitch 1 is an Igmp Querier 62 AlliedWare OS How To Note Igmp63 AlliedWare OS How To Note Igmp Explanation of Igmp fast leave64 AlliedWare OS How To Note Igmp When fast leave is disabledGroup Entry timeout 2 secs Ports Fast Leave OffGroup Entry timeout Secs Ports None When you enable fast leave on switchIt is safe to ignore the group entry on switch 65 AlliedWare OS How To Note IgmpWhen you set fast leave on all interfaces 66 AlliedWare OS How To Note IgmpTo specify single mode, use either of the commands Multiple host mode for fast leaveTo specify multiple mode, use the command 67 AlliedWare OS How To Note Igmp68 AlliedWare OS How To Note Igmp Timer and counter relationships Configurable Igmp timers and counters69 AlliedWare OS How To Note Igmp 70 AlliedWare OS How To Note Igmp Initial configurationEach example modifies the following base configuration Software versions71 AlliedWare OS How To Note Igmp Last Member Query Count and Last Member Query Interval Default values72 AlliedWare OS How To Note Igmp What these counters do73 AlliedWare OS How To Note Igmp Potential problems with changing these countersHow to change these counters Last Member Query Interval 255 10secs74 AlliedWare OS How To Note Igmp Last Member Query CountRobustness Variable Potential problems with changing this counterHow to change this counter What this counter doesPotential problems with changing this timer Default Query IntervalWhat this timer does How to change this timerQuery 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 Default Timeout Interval = 2*130 + 100/10 = 270 seconds 79 AlliedWare OS How To Note Igmp80 AlliedWare OS How To Note Igmp Default Timeout Interval = 2*125 + 100/10 = 260 secondsDefault Timeout Interval 280 Secs Query Response Interval 200 10secsDefault Timeout Interval 180 Secs 81 AlliedWare OS How To Note IgmpDefault Query Interval 200 Secs Default Timeout Interval 410 82 AlliedWare OS How To Note IgmpCommands to configure these settings are Example of bad choices for timer valuesImagine the following changes to the configuration 83 AlliedWare OS How To Note IgmpProblem 3 Default Timeout Interval too short Problem 1 Last Member Query Interval too shortProblem 2 Query Response Interval short Last Member Query Interval was set to 5, using the commandFor more information, see Synchronisation of timers on 85 AlliedWare OS How To Note Igmp86 AlliedWare OS How To Note Igmp Stopping snoopers from snooping non-IGMP messages87 AlliedWare OS How To Note Igmp Router uses Ospf Configure the router88 AlliedWare OS How To Note Igmp Ports 2489 AlliedWare OS How To Note Igmp Ports 25Preventing an All Groups entry for a port Disabled All-groups Ports90 AlliedWare OS How To Note Igmp Disabling All Groups entry for a portEntry timeout 216 Secs Check the group entry timeout valuesReset port 24’s packet counters Enabling All Groups entry again92 AlliedWare OS How To Note Igmp Check the group entry timeout values againEntry timeout Secs MulticastPktsEntry timeout 259 Secs Enable Igmp debugging93 AlliedWare OS How To Note Igmp 94 AlliedWare OS How To Note Igmp MulticastPkts 91495 AlliedWare OS How To Note Igmp Controlling which addresses create All Groups entries96 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 Using the other routermode options 100 AlliedWare OS How To Note IgmpStatically specifying that a port is a router port 101 AlliedWare OS How To Note IgmpCheck the current Igmp snooping entries Statically add port 6 as a router port attached to Vlan To remove the static configuration, simply delete it102 AlliedWare OS How To Note Igmp Stop port 6 from being a static router portIgmp debugging 103 AlliedWare OS How To Note IgmpClient joins a group Client leaves a group IgmpSnoopMembershipQuery setting timer at 2 secs for group104 AlliedWare OS How To Note Igmp Several minutes later the group entry times outPort entry times out Manager Switch 3 del vlan=100 port=5105 AlliedWare OS How To Note Igmp Snooped ports changeReport is filtered out 106 AlliedWare OS How To Note IgmpPort in the All Groups list is unplugged 107 AlliedWare OS How To Note Igmp Output for show ip igmp changesAppendix STP state Switch108 AlliedWare OS How To Note Igmp State Forwarding109 AlliedWare OS How To Note Igmp Manager Switch 3 show stp port=25-26